AC ’97 SoundMAX® Codec
AD1888
Rev. A
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no responsibility is assumed by Analog Devices for its use, nor for any infringements of
patents or other rights of third parties that may result from its use. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent
or patent rights of Analog Devices. Trademarks and registered trademarks are the property
of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved.
FEATURES
AC ’97 2.3 compatible features
6 DAC channels for 5.1 surround
90 dB dynamic range
20-bit PCM DACs
S/PDIF output
Integrated stereo headphone amplifiers
Phone, aux, and line-in
High quality CD input
Selectable MIC input
Mono output
External amplifier power-down control
Double rate audio (fS = 96 kHz)
Power-management modes
48-lead LQFP and 48-lead LFCSP
ENHANCED FEATURES
Selectable front and rear MIC inputs with preamp
Integrated PLL for system clocking
Crystal-free operation
Variable sample rate 7 kHz to 96 kHz
Jack sense (auto topology switching)
Software-controlled VREF_OUT for MIC bias
Software enabled outputs for jack sharing
Auto down-mix and channel spreading modes
FUNCTIONAL BLOCK DIAGRAM
ID0
ID1
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
SPDIF_OUT
EAPD
JS0
JS1
VREF
VREFOUT
AC '97
CONTROL
REGISTERS
DAC
SLOT
LOGIC
G = GAIN
A = ATTENUATION
M=MUTE
Z=HIGH-Z
M AMONO_OUT
MGA
M16-BIT Σ-Δ
ADC
G
M
G
M M M M M M
MGA
MGA
MGA
MGA
MGA
M
GA
M
GA
M
GA
M
GA
M
GA
M
GA
M
GA
M
GA
ADC
SLOT
LOGIC
PLL
AC '97 INTERFACE
SPDIF
TX
EAPD
JACK
SENSE
LOGIC
VOLTAGE
REFERENCE
M ASURR_L/
HP_OUT_L HP
M ASURR_R/
HP_OUT_R HP
MZ ALFE_OUT
MZ A
C
ENTER_OUT
MZ ALINE_OUT_R
MZ ALINE_OUT_L
16-BIT Σ-Δ
ADC
PHONE_IN
CD_L
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
MIC1
MIC2
XTAL_IN
AD1888
XTAL_OUT
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
M
GA
G
DIFF
AMP
04294-001
Figure 1.
AD1888
Rev. A | Page 2 of 32
TABLE OF CONTENTS
Specifications..................................................................................... 3
Test Conditions............................................................................. 3
Timing Parameters ........................................................................... 6
Absolute Maximum Ratings............................................................ 8
Environmental Conditions.......................................................... 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions..............................9
Outline Dimensions ....................................................................... 31
Ordering Guide .......................................................................... 31
REVISION HISTORY
8/05—Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 31
Changes to Ordering Guide .......................................................... 31
10/03—Revision 0: Initial Version
AD1888
Rev. A | Page 3 of 32
SPECIFICATIONS
TEST CONDITIONS
Standard Test Conditions
Unless otherwise noted:
• Temperature 25°C
• Digital Supply (DVDD) 3.3 V
• Analog Supply (AVDD) 5.0 V
• Sample Rate (fS) 48 kHz
• Input Signal 1 kHz
• Analog Output Pass Band 20 Hz to 20 kHz
DAC Test Conditions
• Calibrated
• −3 dB attenuation relative to full scale
• 0 dB input
• 10 kΩ output load LINE_OUT, MONO_OUT, CENTER_OUT,
and LFE_OUT
• 32 Ω output load (HP_OUT)
ADC Test Conditions
• Calibrated
• 0 dB gain
• Input −3.0 dB relative to full scale
Table 1.
Parameter Min Typ Max Unit
ANALOG INPUT
Input Voltage (RMS Values Assume Sine Wave Input)
LINE_IN, CD, AUX, PHONE_IN 1 V rms
2.83 V p-p
MIC_IN with 30 dB Preamp 0.032 V rms
0.089 V p-p
MIC_IN with 20 dB Preamp 0.1 V rms
0.283 V p-p
MIC_IN with 10 dB Preamp 0.316 V rms
0.894 V p-p
MIC_IN with 0 dB Gain 1 V rms
2.83 V p-p
Input Impedance1 20 KΩ
Input Capacitance1 5 7.5 pF
MASTER VOLUME
Step Size (Line Out, Mono Out, Surround Out, Center, LFE) 1.5 dB
Output Attenuation Range Span1 46.5 dB
Mute Attenuation of 0 dB Fundamental1 80 dB
PROGRAMMABLE GAIN AMPLIFIER—ADC
Step Size (0 dB to 22.5 dB) 1.5 dB
PGA Gain Range Span 22.5 dB
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Signal-to-Noise Ratio (SNR)
CD to LINE_OUT 90 dB
LINE, AUX, or PHONE to LINE_OUT1 90 dB
MIC1 or MIC2 (Note: MIC Gain of 0 dB) to LINE_OUT1 90 dB
Step Size All Mixer Inputs 1.5 dB
Input Gain/Attenuation Range: All Mixer Inputs 46.5 dB
DIGITAL DECIMATION AND INTERPOLATION FILTERS1
Pass Band 0 0.4 × fSHz
Pass-Band Ripple ±0.09 dB
Transition Band 0.4 × fS 0.6 × fSHz
Stop Band 0.6 × fS ∞ Hz
Stop-Band Rejection −74 dB
Group Delay 16/fS sec
Group Delay Variation over Pass Band 0 μs
AD1888
Rev. A | Page 4 of 32
Parameter Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS
Resolution 16 Bits
Total Harmonic Distortion (THD) AVDD = 5.0 V −78 dB
Dynamic Range (−60 dB Input THD + N Referenced to FS, A-Weighted)
AVDD = 5.0 V
80
dB
Signal-to-Intermodulation Distortion1 (CCIF Method) 84 dB
ADC Crosstalk1
Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L) −85 dB
LINE_IN to Other −85 dB
Gain Error (Full-Scale Span Relative to Nominal Input Voltage) ±10 %
Interchannel Gain Mismatch (Difference of Gain Errors) ±0.5 dB
ADC Offset Error1 (0 dB Gain, HPF On) ±10 mV
DIGITAL-TO-ANALOG CONVERTERS
Resolution 20 Bits
Total Harmonic Distortion (THD), LINE_OUT, AVDD = 5.0 V −80 dB
Total Harmonic Distortion (THD), HP_OUT, AVDD = 5.0 V −70 dB
Total Harmonic Distortion (THD), CENTER/LFE, AVDD = 5.0 V −80 dB
Dynamic Range (−60 dB Input THD + N Referenced to FS A-Weighted)
AVDD = 5.0 V, All Outputs
90 dB
Signal-to-Intermodulation Distortion1 (CCIF Method) 88 dB
Gain Error (Full-Scale Span Relative to Nominal Input Voltage) ±10 %
Interchannel Gain Mismatch (Difference of Gain Errors) ±0.7 dB
DAC Crosstalk (Input L, Zero R, Read LINE_OUT_R; Input R,
Zero L, Read LINE_OUT_L, 10 kΩ Load)1
−80 dB
Total Audible Out-of-Band Energy1 (Measured from 0.6 × fS to 20 kHz) −40 dB
ANALOG OUTPUT
Full-Scale Output Voltage; LINE_OUT/MONO_OUT, CENTER_OUT, LFE_OUT 1 V rms
2.83 V p-p
Output Impedance1 300 Ω
External Load Impedance1 (LINE_OUT, CENTER_OUT/LFE_OUT, MONO_OUT) 10 kΩ
Output Capacitance1 15 pF
External Load Capacitance1 100 pF
Full-Scale Output Voltage; HP_OUT (0 dB Gain) 1 V rms
External Load Impedance1; HP_OUT 32 Ω
VREF 2.05 2.25 2.45 V
VREF_OUT (VREFH = 0) 2.25 V
VREF_OUT (VREFH = 1) 3.65 V
VREF_OUT Current Drive 5 mA
Mute Click (Muted Output Minus Unmuted Midscale DAC Output) ±5 mV
STATIC DIGITAL SPECIFICATIONS
High Level Input Voltage (VIH): Digital Inputs 0.65 × DVDD V
Low Level Input Voltage (VIL) 0.35 × DVDD V
High Level Output Voltage (VOH), IOH = 2 mA 0.9 × DVDD V
Low Level Output Voltage (VOL), IOL = 2 mA 0.1 × DVDD V
Input Leakage Current −10 +10 μA
Output Leakage Current −10 +10 μA
AD1888
Rev. A | Page 5 of 32
Parameter Min Typ Max Unit
POWER SUPPLY
Power Supply Range, Analog (AVDD) 4.75 5.25 V
Power Supply Range, Digital (DVDD) 3.15 3.45 V
Power Dissipation 5 V/3.3 V 563 mW
Analog Supply Current 5 V (AVDD) 70 mA
Digital Supply Current 3.3 V (DVDD) 53 mA
Power Supply Rejection (100 mV p-p Signal @ 1 kHz)1
(At Both Analog and Digital Supply Pins, Both ADCs and DACs)
−40 dB
1 Guaranteed but not tested.
Parameter PR[K:I]1PR[6:0]1DVDD Typ AVDD Typ Unit
POWER-DOWN STATES2
Fully Active 000 000 0000 53 70 mA
ADC 000 000 0001 44 66 mA
FRONT DAC 000 000 0010 46 61 mA
SURROUND DAC 010 000 0000 46 61 mA
CENTER/LFE DAC 101 000 0000 46 61 mA
ADC + ALL DACs 111 000 0011 12 33 mA
Mixer 000 000 0100 52 44 mA
ADC + Mixer 000 000 0101 45 39 mA
ALL DACs + Mixer 111 000 0110 31 14 mA
ADC + ALL DACs + Mixer 111 000 0111 12 8 mA
Standby 111 011 1111 0 0 mA
Headphone Standby 000 100 0000 52 65 mA
1 PR bits are controlled in Reg. 2Ah and 26h.
2 Values presented with VREFOUT loaded.
Parameter Min Typ Max Unit
CLOCK SPECIFICATIONS1
Input Clock Frequency (XTAL Mode or Clock Oscillator) 24.576 MHz
Input Clock Frequency (Reference Clock Mode) 14.31818 MHz
Input Clock Frequency (USB Clock Mode) 48.000 MHz
Recommended Clock Duty Cycle 40 50 60 %
1 Guaranteed but not tested.
AD1888
Rev. A | Page 6 of 32
TIMING PARAMETERS
Guaranteed over operating temperature range.
Table 2.
Parameter Symbol Min Typ Max Unit
RESET Active Low Pulse Width tRST_LOW 1.0 μs
RESET Inactive to BIT_CLK Startup Delay tRST2CLK 162.8 400,000 ns
SYNC Active High Pulse Width tSYNC_HIGH 1.3 μs
SYNC Low Pulse Width tSYNC_LOW 19.5 μs
SYNC Inactive to BIT_CLK Startup Delay tSYNC2CLK 162.8 ns
BIT_CLK Frequency 12.288 MHz
BIT_CLK Frequency Accuracy ±1.0 ppm
BIT_CLK Period tCLK_PERIOD 81.4 ns
BIT_CLK Output Jitter1, 2 750 ps
BIT_CLK High Pulse Width tCLK_HIGH 40 41.7 ns
BIT_CLK Low Pulse Width tCLK_LOW 39.7 41.4 ns
SYNC Frequency 48.0 kHz
SYNC Period tSYNC_PERIOD 20.8 μs
Setup to Falling Edge of BIT_CLK tSETUP 4 ns
Hold from Falling Edge of BIT_CLK tHOLD 3 ns
BIT_CLK Rise Time tRISECLK 2 4 6 ns
BIT_CLK Fall Time tFALLCLK 2 4 6 ns
SYNC Rise Time tRISESYNC 2 4 6 ns
SYNC Fall Time tFALLSYNC 2 4 6 ns
SDATA_IN Rise Time tRISEDIN 2 4 6 ns
SDATA_IN Fall Time tFALLDIN 2 4 6 ns
SDATA_OUT Rise Time tRISEDOUT 2 4 6 ns
SDATA_OUT Fall Time tFALLDOUT 2 4 6 ns
End of Slot 2 to BIT_CLK, SDATA_IN Low tS2_PDOWN 0 1.0 μs
Setup to RESET Inactive (SYNC, SDATA_OUT) tSETUP2RST 15 ns
Rising Edge of RESET to Hi-Z Delay tOFF 25 ns
Propagation Delay 15 ns
RESET Rise Time 50 ns
Output Valid Delay from BIT_CLK Rising 15 ns
1 Guaranteed but not tested.
2 Output jitter directly dependent on crystal input jitter.
RESET
BIT_CLK
SDATA_IN
t
RST_LOW
t
RST2CLK
t
TRI2ACTV
t
TRI2ACTV
04294-002
Figure 2. Cold Reset Timing (Codec is Supplying the Bit_CLK Signal)
SYNC
BIT_CLK
t
SYNC_HIGH
t
SYNC2CLK
04294-003
Figure 3. Warm Reset Timing
AD1888
Rev. A | Page 7 of 32
BIT_CLK
SYNC
tCLK_LOW
tCLK_HIGH
tCLK_PERIOD
tSYNC_LOW
tSYNC_PERIOD
tSYNC_HIGH
04294-004
Figure 4. Clock Timing
BIT_CLK
SYNC
SDATA_IN
SDATA_OUT
tRISECLK tFALLCLK
tRISESYNC tFALLSYNC
tRISEDIN tFALLDIN
tRISEDOUT tFALLDOUT
0
4294-005
Figure 5. Signal Rise and Fall Times
BIT_CLK
SYNC
SDATA_IN
SDATA_OUT
BIT_CLK NOT TO SCALE
SLOT 1 SLOT 2
WRITE TO
0x26 DATA
PR4
t
S2_PDOWN
04294-006
Figure 6. AC-Link low Power Mode Timing
BIT_CLK
SDATA_OUT
SDATA_IN
SYNC
tCO tSETUP
V
IH
V
IL
V
OH
V
OL
tHOLD
04294-007
Figure 7. AC-Link Low Power Mode Timing
RESET
SDATA_OUT
SDATA_IN, BIT_CLK,
EAPD, SPDIF_OUT
AND DIGITAL I/O Hi-Z
t
SETUP2RST
t
OFF
0
4294-008
Figure 8. ATE Test Mode
AD1888
Rev. A | Page 8 of 32
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Min Max Unit
Power Supplies
Digital (DVDD) −0.3 +3.6 V
Analog (AVDD) −0.3 +6.0 V
Input Current (Except Supply Pins) ±10.0 mA
Analog Input Voltage (Signal Pins) −0.3 AVDD + 0.3 V
Digital Input Voltage (Signal Pins) −0.3 DVDD + 0.3 V
Ambient Temperature (Operating) 0 +70 °C
Storage Temperature −65 +150 °C
Stresses greater than those listed under Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ENVIRONMENTAL CONDITIONS
Ambient temperature rating:1
TCASE = Case temperature in °C
PD = Power dissipation in W
θJA = Thermal resistance (junction-to-ambient)
θJC = Thermal resistance (junction-to-case)
1 All measurements per EIA/JESD51 with 2S2P test board per EIA/JESD51-7.
Table 4.
Package θJA θJC
LQFP 50.1°C/W 17.8°C/W
LFCSP 50°C/W 25.88°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
AD1888
Rev. A | Page 9 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
48
SPDIF
47
EAPD
46
ID1
45
ID0
44
AV
SS
3
43
AV
DD
3
42
NC
41
SURR_OUT_R/HP_OUT_R
40
AV
SS
2
39
SURR_OUT_L/HP_OUT_L
38
AV
DD
2
37
MONO_OUT
35
LINE_OUT_L (FRONT_L)
34
AV
DD
4
33
AV
SS
4
30
AFILT2
31
CENTER_OUT
32
LFE_OUT
36
LINE_OUT_R (FRONT_R)
29
AFILT1
28
V
REFOUT
27
V
REF
25
AV
DD
1
26
AV
SS
1
2
XTL_IN
3
XTL_OUT
4
DV
SS
1
7
DV
SS
2
6
BIT_CLK
5
SDATA_OUT
1
DV
DD
1
8
SDATA_IN
9
DV
DD
2
10
SYNC
12
NC
11
RESET
NC = NO CONNECT
13
PHONE_IN
14
AUX_L
15
AUX_R
16
JS1
17
JS0
18
CD_L
19
CD_GND_REF
20
CD_R
21
MIC1
22
MIC2
23
LINE_IN_L
24
LINE_IN_R
PIN 1
AD1888
TOP VIEW
(Not to Scale)
0
4294-009
Figure 9. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic I/O Function
DIGITAL INPUT/OUTPUT
2 XTL_IN I Crystal Input (24.576 MHz) or External Clock In (24.576 MHz, 14.31818 MHz, or 48000 MHz).
3 XTL_OUT O Crystal Output.
5 SDATA_OUT I AC-Link Serial Data Output. AD1888 input stream.
6 BIT_CLK O/I AC-Link Bit Clock. 12.288 MHz serial data clock. (Input pin for Secondary mode only.)
8 SDATA_IN O AC-Link Serial Data Input. AD1888 output stream.
10 SYNC I AC-Link Frame Sync.
11 RESET I AC-Link Reset. AD1888 master H/W reset.
48 SPDIF O SPDIF Output.
CHIP SELECTS/CLOCK STRAPPING
45 ID0 I Chip Select Input 0 (Active Low).
46 ID1 I Chip Select Input 1 (Active Low).
JACK SENSE AND EAPD
47 EAPD O EAPD Output.
17 JS0 I Jack Sense 0 Input.
16 JS1 I Jack Sense 1 Input.
ANALOG INPUT/OUTPUT
13 PHONE_IN I Monaural Line-Level Input.
14 AUX_L I Auxiliary Input, Left Channel.
15 AUX_R I Auxiliary Input, Right Channel.
18 CD_L I CD Audio Left Channel.
19 CD_GND_REF I CD Audio Analog Ground Reference for Differential CD Input.
20 CD_ R I CD Audio Right Channel.
21 MIC1 I Rear Panel MIC Input.
22 MIC2 I Front Panel MIC Input.
AD1888
Rev. A | Page 10 of 32
Pin No. Mnemonic I/O Function
23 LINE_IN_L I Line-In Left Channel.
24 LINE_IN_R I Line-In Right Channel.
31 CENTER_OUT O Center Channel Output.
32 LFE_OUT O Low Frequency Enhanced Output.
35 LINE_OUT_L O Line Out (Front) Left Channel.
36 LINE_OUT_R O Line Out (Front) Right Channel.
37 MONO_OUT O Monaural Output to Telephone Subsystem Speakerphone.
39 SURR_OUT_L/HP_OUT_L O Surround Front Headphone Left Channel Output.
41 SURR_OUT_R/HP_OUT_R O Surround Front Headphone Right Channel Output.
FILTER/REFERENCE
27 VREF O Voltage Reference Filter.
28 VREFOUT O Voltage Reference Output 5 mA Drive (intended for MIC bias).
29 AFILT1 O Antialiasing Filter Capacitor—ADC Right Channel.
30 AFILT2 O Antialiasing Filter Capacitor—ADC Left Channel.
POWER AND GROUND SIGNALS
1 DVDD1 I Digital VDD 3.3 V.
4 DVSS1 I Digital GND.
7 DVSS2 I Digital GND.
9 DVDD2 I Digital VDD 3.3 V.
25 AVDD1 I Analog VDD 5.0 V.
26 AVSS1 I Analog GND.
33 AVSS4 I Analog GND.
34 AVDD4 I Analog VDD 5.0 V.
38 AVDD2 I Analog VDD 5.0 V.
40 AVSS2 I Analog GND.
43 AVDD3 I Analog VDD 5.0 V.
44 AVSS3 I Analog GND.
NO CONNECTS
12 NC No Connect.
42 NC No Connect.
AD1888
Rev. A | Page 11 of 32
Table 6. Indexed Control Registers
Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
00h Reset X SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 0090h
02h Master
Volume
MM X LMV5 LMV4 LMV3 LMV2 LMV1 LMV0 MMRM1X RMV5 RMV4 RMV3 RMV2 RMV1 RMV0 8000h
04h Headphone
Volume
HPM X LHV5 LHV4 LHV3 LHV2 LHV1 LHV0 HPRM1X RHV5 RHV4 RHV3 RHV2 RHV1 RHV0 8000h
06h Mono
Volume
MVM X X X X X X X X X MV5 MV4 MV2 MV2 MV1 MV0 8000h
0Ch Phone
Volume
PHM X X X X X X X X X X PHV4 PHV3 PHV2 PHV1 PHV0 8008h
0Eh MIC
Volume
MCM X X X X X X X X M20 X MCV4 MCV3 MCV2 MCV1 MCV0 8008h
10h Line-In
Volume
LVM X X LLV4 LLV3 LLV2 LLV1 LLV0 LVRM1X X RLV4 RLV3 RLV2 RLV1 RLV0 8808h
12h CD
Volume
CVM X X LCV4 LCV3 LCV2 LCV1 LCV0 CDRM1X X RCV4 RCV3 RCV2 RCV1 RCV0 8808h
16h AUX
Volume
AVM X X LAV4 LAV3 LAV2 LAV1 LAV0 AVRM1X X RAV4 RAV3 RAV2 RAV1 RAV0 8808h
18h PCM Out
Volume
OM X X LOV4 LOV3 LOV2 LOV1 LOV0 OMRM1X X ROV4 ROV3 ROV2 ROV1 ROV0 8808h
1Ah Record
Select
X X X X X LS2 LS1 LS0 X X X X X RS2 RS1 RS0 0000h
1Ch Record
Gain
IM X X X LIM3 LIM2 LIM1 LIM0 IMRM1X X X RIM3 RIM2 RIM1 RIM0 8000h
20h General-
Purpose
X X X X DRSS1 DRSS0 X MS LPBK X X X X X X X 0000h
24h Audio Int.
and Paging
I4 X X X I0 X X X X X X X PG3 PG2 PG1 PG0 xxxxh
26h Power-Down
Ctrl/Stat
EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 X X X X REF ANL DAC ADC NA
28h Ext’d
Audio ID
ID1 ID0 X X REV1 REV0 AMAP LDAC SDAC CDAC DSA1 DSA0 X SPDIF DRA VRA x3C7h
2Ah Ext’d Audio
Stat/Ctrl
VFORCE X PRK PRJ PRI SPCV X ELDAC ESDAC ECDAC SPSA1 SPSA0 X ESPDIF EDRA EVRA 0xx0h
2Ch PCM Front
DAC Rate
SRF15 SRF14 SRF13 SRF12 SRF11 SRF10 SRF9 SRF8 SRF7 SRF6 SRF5 SRF4 SRF3 SRF2 SRF1 SRF0 BB80h
2Eh PCM Surr
DAC Rate
SRS15 SRS14 SRS13 SRS12 SRS11 SRS10 SRS9 SRS8 SRS7 SRS6 SRS5 SRS4 SRS3 SRS2 SRS1 SRS0 BB80h
30h PCM C/LFE
DAC Rate
SRCL15 SRCL14 SRCL13 SRCL12 SRCL11 SRCL10 SRCL9 SRCL8 SRCL7 SRCL6 SRCL5 SRCL4 SRCL3 SRCL2 SRCL1 SRCL0 BB80h
32h PCM L/R
ADC Rate
SRA15 SRA14 SRA13 SRA13 SRA11 SRA10 SRA9 SRA8 SRA7 SRA6 SRA5 SRA4 SRA3 SRA2 SRA1 SRA0 BB80h
36h Center/LFE
Volume
LM X LFE5 LFE4 LFE3 LFE2 LFE1 LFE0 CM X CNT5 CNT4 CNT3 CNT2 CNT1 CNT0 8080h
38h Surround
Volume
MUTE_L X LSR5 LSR4 LSR3 LSR2 LSR1 LSR0 MUTE_R X RSR5 RSR4 RSR3 RSR2 RSR1 RSR0 8080h
3Ah SPDIF
Control
V X SPSR1 SPSR0 L CC6 CC5 CC4 CC3 CC2 CC1 CC0 PRE COPY /AUD PRO 2000h
72h JACK
SENSE
JS
SPRD
JS1
DMX
JS0
DMX
JS
MT2
JS
MT1
JS
MT0
X X JS1
TMR
JS0
TMR
JS1
MD
JS0
MD
JS1
ST
JS0
ST
JS1
INT
JS0
INT
0000h
74h Serial
Configuration
SLOT 16 REGM2 REGM1 REGM0 REGM3 DRF X CHEN X LBKS1 LBKS0 INTS X SPAL SPDZ SPLNK 1001h
76h Misc
Control
Bits
DACZ AC97NC MSPLT LODIS CLDIS HPSEL DMIX1 DMIX0 SPRD X LOSEL SRU VREFH VREFD MBG1 MBG0 0000h
7Ch Vendor
ID1
F7 F6 F5 F4 F3 F2 F1 F0 S7 S6 S5 S4 S3 S2 S1 S0 4144h
7Eh Vendor
ID2
T7 T6 T5 T4 T3 T2 T1 T0 REV7 REV6 REV5 REV4 REV3 REV2 REV1 REV0 5368h
1 For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
All registers not shown and bits containing an X are assumed to be reserved.
Odd register addresses are aliased to the next lower even address.
Reserved registers should not be written to.
Zeros should be written to reserved bits.
AD1888
Rev. A | Page 12 of 32
Table 7. Reset Register (Index 00h)
Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
00h Reset X SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 0090h
All registers not shown and bits containing an X are assumed to be reserved.
Writing any value to this register performs a register reset, which causes all registers to revert to their default values (except 74h, which forces the serial configuration).
Reading this register returns the ID code of the part and a code for the type of 3D Stereo Enhancement.
ID[9:0] Identify Capability. The ID decodes the capabilities of AD1888 based on the following:
Bit = 1 Function AD1888
ID0 Dedicated Mic PCM In Channel 0
ID1 Modem Line Codec Support 0
ID2 Bass and Treble Control 0
ID3 Simulated Stereo (Mono to Stereo) 0
ID4 Headphone Out Support 1
ID5 Loudness (Bass Boost) Support 0
ID6 18-Bit DAC Resolution 0
ID7 20-Bit DAC Resolution 1
ID8 18-Bit ADC Resolution 0
ID9 20-Bit ADC Resolution 0
SE[4:0] Stereo Enhancement. The AD1888 does not provide hardware 3D stereo enhancement. (All bits are zeros.)
Table 8. Master Volume Register (Index 02h)
Reg
No. Name D15 D14 D131D12 D11 D10 D9 D8 D7 D6 D51D4 D3 D2 D1 D0 Default
02h Master
Volume
MM X LMV5 LMV4 LMV3 LMV2 LMV1 LMV0 MMRM2X RMV5 RMV4 RMV3 RMV2 RMV1 RMV0 8000h
1 Refer to Table 10 for examples. This register controls the Line_Out volume controls for both stereo channels and mute bit. Each volume subregister contains five bits,
generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility whenever the D5 or D13 bits are set
to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever these bits are set to 1.
2 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved.
Note that depending on the state of the AC97NC bit in Register 0x76, this register has the following additional functionality:
For AC97NC = 0, the register controls the Line_out output Attenuators only.
For AC97NC = 1, the register controls the Line_out, Center, and LFE output Attenuators.
RMV[5:0] Right Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a
maximum attenuation of 46.5 dB.
MMRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the MM
bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
LMV[5:0] Left Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum
attenuation of 46.5 dB.
MM Headphones Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in
Register 76h is set to 1.
AD1888
Rev. A | Page 13 of 32
Table 9. Headphones Volume Register (Index 04h)
Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
04h Headphone
Volume
HPM X LHV5 LHV4 LHV3 LHV2 LHV1 LHV0 HPRM1X RHV5 RHV4 RHV3 RHV2 RHV1 RHV0 8000h
Table 10. Volume Settings for Master and Headphone
Reg. 76h
Control Bits
Master Volume (02h) and Headphone Volume (04h)
MSPLTT
1Left Channel Volume D[13:8] Right Channel Volume D[5:0]
D15 WRITE READBACK Function D71WRITE READBACK Function
0 0 00 0000 00 0000 0 dB Gain x 00 0000 00 0000 0 dB Gain
0 0 00 1111 00 1111 −22.5 dB Gain x 00 1111 00 1111 −22.5 dB Gain
0 0 01 1111 01 1111 −46.5 dB Gain x 01 1111 01 1111 −46.5 dB Gain
0 0 1x xxxx 01 1111 −46.5 dB Gain x 1x xxxx 01 1111 −46.5 dB Gain
0 1 xx xxxx xx xxxx −∞ dB Gain, Muted x xx xxxx xx xxxx −∞ dB Gain, Muted
1 0 1x xxxx 01 1111 −46.5 dB Gain 1 xx xxxx xx xxxx −∞ dB Gain, only
Right Muted
1 1 xx xxxx xx xxxx −∞ dB Gain, Left only Muted 0 xx xxxx xx xxxx −46.5 dB Gain
1 1 xx xxxx xx xxxx −∞ dB Gain, Left Muted 1 xx xxxx xx xxxx −∞ dB Gain, Right Muted
1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
x in the above table is don’t care.
Table 11. Mono Volume Register (Index 06h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D51D4 D3 D2 D1 D0 Default
06h Mono
Volume
MVM X X X X X X X X X MV5 MV4 MV3 MV2 MV1 MV0 8000h
1 Refer to Table 12 for examples. This register controls the Mono output volume and mute bit. The volume register contains five bits, generating 32 volume levels with
31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 bit is set to 1, their respective lower five volume bits
are automatically set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever this bit is set to 1. All registers not shown and bits containing an X
are assumed to be reserved.
MV[5:0] Mono Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a
maximum attenuation of 46.5 dB.
MVM Mono Volume Mute. When this bit is set to 1, the channel is muted.
Table 12. Volume Settings for Mono
Control Bits D[4:0] for Mono (06h)
D15 WRITE READBACK Function
0 0 0000 0 0000 0 dB Gain
0 0 1111 0 1111 −22.5 dB Gain
0 1 1111 1 1111 −46.5 dB Gain
1 x xxxx x xxxx −∞ dB Gain, Muted
x in the above table is a wild card and has no effect on the value.
AD1888
Rev. A | Page 14 of 32
Table 13. Phone_in Volume Register (Index 0Ch)
Reg
No.
Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0Ch Phone_in
Volume
PHM X X X X X X X X X X PHV4 PHV3 PHV2 PHV1 PHV0 8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 15 for examples.
PHV[4:0] Phone Volume. Allows setting the Phone Volume attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB represents
1.5 dB, and the gain range is +12 dB to −34.5 dB. The default value is 0 dB, with the mute bit enabled.
PHM Phone Mute. When this bit is set to 1, the Phone channel is muted.
Table 14. MIC Volume Register (Index 0Eh)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0Eh MIC
Volume
MCM X X X X X X X X M20 X MCV4 MCV3 MCV2 MCV1 MCV0 8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 15 for examples.
MCV[4:0] MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 volume levels. The LSB represents 1.5 dB, and the gain range
is +12 dB to −34.5 dB. The default value is 0 dB, with mute enabled.
M20 MIC Gain Boost. This bit allows setting additional MIC gain to increase the microphone sensitivity. The nominal gain boost by
default is 20 dB; however, Bits D0 and D1 (MBG[1:0]) on the miscellaneous control bits register (76h) allow changing the gain
boost to 10 dB or 30 dB, if necessary.
0 = Disabled; Gain = 0 dB
1 = Enabled; Default Gain = 20 dB (see Register 76h, Bits D0, D1)
MCM MIC Mute. When this bit is set to 1, the channel is muted.
Table 15. Volume Settings for Phone and MIC
Control Bits
D[4:0] Phone (0Ch) and MIC (0Eh)
D15 WRITE READBACK Function
0 0 0000 0 0000 12 dB Gain
0 0 1000 0 1000 0 dB Gain
0 1 1111 1 1111 −34.5 dB Gain
1 x xxxx x xxxx −∞ dB Gain, Muted
x in the above table is a wild card, and has no effect on the value.
AD1888
Rev. A | Page 15 of 32
Table 16. Line-In Volume Register (Index 10h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
10h Line-In
Volume
LVM X X LLV4 LLV3 LLV2 LLV1 LLV0 LVRM1X X RLV4 RLV3 RLV2 RLV1 RLV0 8808h
1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
RLV[4:0] Right Line-In Volume. Allows setting the Line-In Right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The
LSB represents 1.5 dB, and the range is +12 dB to −34.d dB. The default value is 0 dB, mute enabled.
LVRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the LIM bit.
Otherwise, this bit will always read 0 and will have no effect when set to 1.
LLV[4:0] Left Line-In Volume. Allows setting the Line-In left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
LVM Line-In Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is set
to 1, in which case this mute bit will only affect the left channel.
Table 17. CD Volume Register (Index 12h)
Reg
No.
Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
12h CD
Volume
CVM X X LCV4 LCV3 LCV2 LCV1 LCV0 CDRM1X X RCV4 RCV3 RCV2 RCV1 RCV0 8808h
1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 or examples.
RCV[4:0] Right CD Volume. Allows setting the CD right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
CDRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the Right channel separately from the CVM
bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
LCV[4:0] Left CD Volume. Allows setting the CD left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −24.5 dB. The default value is 0 dB, mute enabled.
CVM CD Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is
set to 1, in which case this mute bit will affect only the left channel.
Table 18. AUX Volume Register (Index 16h)
Reg
No.
Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
16h AUX
Volume
AVM X X LAV4 LAV3 LAV2 LAV1 LAV0 AVRM1X X RAV4 RAV3 RAV2 RAV1 RAV0 8808h
1 For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
RAV[4:0] Right AUX Volume. Allows setting the AUX right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
AVRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the AVM
bit. Otherwise, this bit will always read 0 and will have no affect when set to 1.
LAV[4:0] Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
AVM PCM Out Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register
76h is set to 1, in which case this mute bit will affect only the left channel.
AD1888
Rev. A | Page 16 of 32
Table 19. PCM-Out Volume Register (Index 18h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
18h PCM
Out
Volume
OM X X LOV4 LOV3 LOV2 LOV1 LOV0 OMRM1X X ROV4 ROV3 ROV2 ROV1 ROV0 8808h
1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
Note that depending on the state of the AC97NC bit in Register 76h, this register has the following additional functionality:
For AC97NC = 0, the register also controls the Surround, Center, and LFE DAC Gain/Attenuators.
For AC97NC = 1, the register controls the PCM Out Volume only.
ROV[4:0] Right PCM Out Volume. Allows setting the PCM right channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
OMRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the AVM
bit. Otherwise, this bit will always read 0 and will have no affect when set to 1.
LOV[4:0] Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
OM PCM Out Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register
76h is set to 1, in which case this mute bit will affect only the left channel.
Table 20. Volume Settings for Line-In, CD Volume, AUX, and PCM-Out
Reg. 76h
Control Bits
Line-In (10h), CD (12h), AUX (16h) and PCM-Out (18h)
Left Channel Volume D[12:8] Right Channel Volume D[4:0]
MSPLTT
1D15 WRITE READBACK Function D71WRITE READBACK Function
0 0 0 0000 0 0000 12 dB Gain x 0 0000 0 0000 12 dB Gain
0 0 0 1000 0 1000 0 dB Gain x 0 1000 0 1000 0 dB Gain
0 0 1 1111 1 1111 −34.5 dB Gain x 1 1111 1 1111 −34.5 dB Gain
0 1 x xxxx x xxxx −∞ dB Gain, Muted x x xxxx x xxxx −∞ dB Gain, Muted
1 0 1 1111 1 1111 −34.5 dB Gain 1 x xxxx x xxxx −∞ dB Gain, Right Only Muted
1 1 x xxxx x xxxx −∞ dB Gain, Left Only Muted 0 1 1111 1 1111 −34.5 dB Gain
1 1 x xxxx x xxxx −∞ dB Gain, Left Muted 1 x xxxx x xxxx −∞ dB Gain, Right Muted
1 For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, RM Bit has no effect.
x in the above table is don’t care.
Table 21. Record Select Control Register (Index 1Ah)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
1Ah Record
Select
X X X X X LS2 LS1 LS0 X X X X X RS2 RS1 RS0 0000h
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table 22 for examples. Used to select the record source independently for the right and left channels. For MIC recording, see MS bit (Register 20h) for
MIC1 and MIC2 input selection.
RS [2:0] Right Record Select
LS [2:0] Left Record Select
AD1888
Rev. A | Page 17 of 32
Table 22. Settings for Record Select Control
LS [10:8] Left Record Source RS [2:0] Right Record Source
000 MIC 000 MIC
001 CD_L 001 CD_R
010 Muted 010 Muted
011 AUX_L 011 AUX_R
100 LINE_IN_L 100 LINE_IN_R
101 Stereo Mix (L) 101 Stereo Mix (R)
110 Mono Mix 110 Mono Mix
111 PHONE_IN 111 PHONE_IN
Table 23. Record Gain Register (Index 1Ch)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
1Ch Record
Gain
IM X X X LIM3 LIM2 LIM1 LIM0 IMRM1X X X RIM3 RIM2 RIM1 RIM0 8000h
1 For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 24 for examples.
RIM[3:0] Right Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
IMRM Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the IM bit.
Otherwise, this bit will always read 0 and will have no effect when set to 1.
LIM[3:0] Left Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
IM Input Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is set to
1, in which case this mute bit will affect only the left channel.
Table 24. Settings for Record Gain Register
Reg. 76h
Control Bits
Record Gain (1Ch)
Left Channel Input Mixer D[11:8] Right Channel Input Mixer D[3:0]
MSPLTT
1D15 WRITE READBACK Function D71WRITE READBACK Function
0 0 1111 1111 22.5 dB Gain x 1111 1111 22.5 dB Gain
0 0 0000 0000 0 dB Gain x 0000 0000 0 dB Gain
0 1 xxxx xxxx −∞ dB Gain, Muted x xxxx xxxx −∞ dB Gain, Muted
1 0 1111 1111 22.5 dB Gain 1 xxxx xxxx −∞ dB Gain, Right Only Muted
1 1 xxxx xxxx −∞ dB Gain, Left Only Muted 0 1111 1111 22.5 dB Gain
1 1 xxxx xxxx −∞ dB Gain, Left Muted 1 xxxx xxxx −∞ dB Gain, Right Muted
1 For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
x is don’t care.
AD1888
Rev. A | Page 18 of 32
Table 25. General-Purpose Register (Index 20h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
20h General-
Purpose
X X X X DRSS1 DRSS0 X MS LPBK X X X X X X X 0000h
This register should be read before writing to generate a mask only for the bit(s) that need to be changed. All registers not shown and bits containing an X are assumed
to be reserved.
LPBK Loopback Control. This bit enables the digital internal loopback from the ADC to the front DAC. This feature is normally used
for test and troubleshooting.
0 = No Loopback (Default)
1 = Loopback PCM digital data from ADC output to DAC
See LBKS bit in Register 0x74 for changing the loopback path to use the Surround or Center/LFE DACs.
MS MIC Select. Selects Mono MIC input.
0 = Select MIC1, from rear panel MIC jack
1 = Select MIC2, from front panel MIC jack
DRSS [1:0] Double Rate Slot Select. The DRSS bits specify the slots for the n + 1 sample outputs. PCM L (n + 1) and PCM R (n + 1) data are
by default provided in output slots 10 and 11.
00: PCM L, R n + 1 Data is on Slots 10, 11 (reset default)
01: PCM L, R n + 1 Data is on Slots 7, 8
10: Reserved
11: Reserved
Table 26. Audio Interrupt and Paging Mechanism Register (Index 24h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
24h Audio
Interrupt and
Paging
I4 X X X I0 X X X X X X X PG3 PG2 PG1 PG0 xxxxh
This register controls the audio interrupt and paging mechanism. All registers not shown and bits containing an X are assumed to be reserved.
PG[3:0] Page Selector (Read Only). This register is used to describe page selector capability for extended features. Reading these bits
returns 0h, which describes page selection as vendor specific only.
I0 INTERRUPT ENABLE (R/W). This enables interrupt generation.
0 = Interrupt Generation is Masked (Default)
1 = Interrupt Generation is Unmasked
The S/W should not unmask the interrupt unless ensured by the AC ’97 controller that no conflict is possible with modem slot 12
GPI functionality.
AC ’97 2.2 compliant controllers will not likely support audio codec interrupt infrastructure. In that case, S/W could poll the
interrupt status after initiating a sense cycle and waiting for Sense Cycle Max Delay to determine if an interrupting event has
occurred.
I4 INTERRUPT STATUS (R/W). This bit provides interrupt status and clear capability.
0 = Interrupt is Clear
1 = Interrupt was Generated
Interrupt event is cleared by writing a 1 to this bit. The interrupt bit will change regardless of condition of interrupt enable (I0)
status. An interrupt in the GPI in slot 12 in the ac link will follow this bit change when interrupt enable (I0) is unmasked.
AD1888
Rev. A | Page 19 of 32
Table 27. Power-Down Control/Status Register (Index 26h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
26h Power-Down
Control/Status
EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 X X X X REF ANL DAC ADC NA
The ready bits are read only; writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the AD1888 subsections. If the bit is a 1, then that
subsection is ready. Ready is defined as the subsection able to perform in its nominal state. All registers not shown and bits containing an X are assumed to be reserved.
ADC ADC Sections Ready to Transmit Data
DAC DAC Sections Ready to Transmit Data
ANL Analog Amplifiers, Attenuators, and Mixers Ready
REF Voltage References, VREF and VREFOUT, up to Nominal Level
PR[6:0] Codec Power-Down Modes. The first three bits are to be used individually rather than in combination with each other. PR3 can be
used in combination with PR2 or by itself. The mixer and reference cannot be powered down via PR3 unless the ADCs and DACs
are also powered down. Nothing else can be powered up until the reference is up. PR5 has no effect unless all ADCs, DACs, and the
ac-link are powered down. The reference and the mixer can be either up or down, but all power-up sequences must be allowed to
run to completion before PR5 and PR4 are both set. In multiple codec systems, the master codec’s PR5 and PR4 bits control the
slave codec. PR5 is also effective in the slave codec if the master’s PR5 bit is clear, but the PR4 bit has no effect except to enable or
disable PR5.
EAPD External Audio Power-Down Control. Controls the state of the EAPD pin.
EAPD = 0 sets the EAPD pin low, enabling an external power amplifier (reset defaults).
EAPD = 1 sets the EAPD pin high, shutting off the external power amplifier.
AD1888
Rev. A | Page 20 of 32
PR0 = 1 PR1 = 1 PR2 = 1 PR4 = 1
NORMAL ADCs OFF
PR0 DACs OF F
PR1
ANALOG
OFF
PR2 OR
PR3
DIGITAL I/F
OFF
PR4
SHUT OFF
AC-LINK
DEFAULT COLD
RESET
READY = 1
PR0 = 0
AND
ADC = 1 WARM
RESET
PR2 = 0
AND
ANL = 1
PR1 = 0
AND
DAC = 1
04294-010
Figure 10. One Example of AC ’97 Power-Down/Power-Up Flow
Table 28. Extended Audio ID Register (Index 28h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
28h Ext’d
Audio
ID
ID1 ID0 X X REV1 REV0 AMAP LDAC SDAC CDAC DSA1 DSA0 X SPDIF DRA VRA x3C7h
The extended audio ID register identifies which extended audio features are supported. A nonzero extended audio ID value indicates one or more of the extended
audio features are supported. All registers not shown and bits containing an X are assumed to be reserved.
VRA Variable Rate PCM Audio Support (Read Only).
This bit returns a 1 when read to indicate that the Variable Rate PCM Audio is supported.
DRA Double Rate Audio (Read Only).
This bit returns a 1 when read to indicate that the optional Double Rate RCM Audio is supported for PCM L and PCM R.
SPDIF SPDIF Support (Read Only). This bit returns a 1 when read to indicate that the SPDIF transmitter is supported (IEC958).
This bit is also used to validate that the SPDIF transmitter output is actually enabled. The SPDIF bit is only allowed to be set high
if the SPDIF pin (48) is pulled down at power-up, enabling the codec transmitter logic. If the SPDIF pin is floating or pulled high
at power-up, the transmitter logic is disabled and therefore this bit returns a low, indicating that the SPDIF transmitter is not
available. This bit must always be read back to verify that the SPDIF transmitter is actually enabled.
DSA[1,0] DAC Slot Assignments (Read/Write) (Reset Default = 00)
00 DACs 1, 2 = 3 and 4 DACs 3, 4 = 7 and 8 DACs 5, 6 = 6 and 9
01 DACs 1, 2 = 7 and 8 DACs 3, 4 = 6 and 9 DACs 5, 6 = disabled
10 DACs 1, 2 = 6 and 9 DACs 3, 4 = disabled DACs 5, 6 = disabled
11 Reserved
CDAC PCM CENTER DAC Support (Read Only).
This bit returns a 1 when read to indicate that PCM center DAC is supported.
SDAC PCM Surround DAC Support (Read Only).
This bit returns a 1 when read to indicate that PCM surround left and right DACs are supported.
LDAC PCM LFE DAC Support (Read Only),
This bit returns a 1 when read to indicate that PCM LFE DAC is supported.
AMAP Slot DAC Mappings Based on Codec ID (Read Only).
This bit returns a 1 when read to indicate that slot/DAC mappings based on codec ID are supported.
REV[1,0] REV[1,0] = 01 indicates codec is AC ’97 revision 2.2 compliant (Read Only).
ID[1:0] Indicates Codec Configuration (Read Only).
00 = Primary
01, 10, 11 = Secondary
AD1888
Rev. A | Page 21 of 32
Table 29. Extended Audio Status and Control Register (Index 2Ah)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Defaul
t
2Ah Extended
Audio
Stat/Ctrl
VFORCE X PRK PRJ PRI SPCV X ELDAC ESDAC ECDAC SPSA1 SPSA0 X ESPDIF EDRA EVRA 0xx0h
The extended audio status and control register is a read/write register that provides status and control of the extended audio features. All registers not shown and bits
containing an X are assumed to be reserved.
EVRA Variable Rate Audio (Read/Write).
EVRA = 0, sets fixed sample rate audio at 48 kHz (Reset Default).
EVRA = 1, enables variable rate audio mode (enables sample rate registers and SLOTREQ signaling).
EDRA Double Rate Audio.
EDRA = 1 enables double rate audio mode in which data from PCM L and PCM R in output slots 3 and 4 is used in conjunction
with PCM L (n + 1) and PCM R (n + 1) data to provide DAC streams at twice the sample rate designated by the PCM front sample
rate control register. When using the double rate audio, only the front DACs are supported and all other DACs (surround, center,
and LFE) are automatically powered down. Note that EDRA can be used without VRA; in that case, the converter rates are forced
to 96 kHz if EDRA = 1.
ESPDIF SPDIF Transmitter Subsystem Enable/Disable Bit (Read/Write).
ESPDIF = 1 enables the SPDIF transmitter.
ESPDIF = 0 disables the SPDIF transmitter (default).
SPSA[1,0] SPDIF Slot Assignment Bits (Read/Write).
These bits control the SPDIF slot assignment and respective defaults, depending on the codec ID configuration. See the
following table.
ECDAC Center DAC Status (Read Only).
ECDAC = 1 indicates the PCM center DAC is ready.
ESDAC Surround DAC status (Read Only).
ESDAC = 1 indicates the PCM surround DACs are ready.
ELDAC LFE DAC status (Read Only).
ELDAC = 1 indicates the PCM LFE DAC is ready.
SPCV SPDIF Configuration Valid (Read Only). Indicates the status of the SPDIF transmitter subsystem, enabling the driver to
determine if the currently programmed SPDIF configuration is supported. SPCV is always valid, independent of the SPDIF
enable bit status.
SPCV = 0 indicates current SPDIF configuration (SPSA, SPSR, DAC slot rate, DRS) is not valid (not supported).
SPCV = 1 indicates current SPDIF configuration (SPSA, SPSR, DAC slot rate, DRS) is valid (supported).
PRI Center DAC Power-Down (Read/Write).
PRI = 1 turns off the PCM Center DAC.
PRJ Surround DACs Power-Down (Read/Write).
PRJ = 1 turns off the PCM surround DACs.
PRK LFE DAC Power-Down (Read/Write).
PRK = 1 turns off the PCM LFE DAC.
VFORCE Validity Force Bit (Reset Default = 0).
When asserted, this bit forces the SPDIF stream validity flag (Bit 28 within each SPDIF L/R subframe) to be con-trolled by the V
bit (D15) in Register 3Ah (SPDIF control register).
VFORCE = 0 and V = 0; the Validity Bit is managed by the codec error detection logic.
VFORCE = 0 and V = 1; the Validity Bit is forced high, indicating subframe data is invalid.
VFORCE = 1 and V = 0; the Validity Bit is forced low, indicating subframe data is valid.
VFORCE = 1 and V = 1; the Validity Bit is forced high, indicating subframe data is invalid.
AD1888
Rev. A | Page 22 of 32
Table 30. AC ’97 2.2 AMAP Compliant Default SPDIF Slot Assignments
Codec ID Function SPSA = 00 SPSA = 01 SPSA = 10 SPSA = 11
00 2-Ch Primary w/SPDIF 3 and 4 7 and 8 [default] 6 and 9 10 and 11
00 4-Ch Primary w/SPDIF 3 and 4 7 and 8 6 and 9[default] 10 and 11
00 6-Ch Primary w/SPDIF 3 and 4 7 and 8 6 and 9 10 and 11[default]
01 +2-Ch Secondary w/SPDIF 3 and 4 7 and 8 6 and 9[default]
01 +4-Ch Secondary w/SPDIF 3 and 4 7 and 8 6 and 9 10 and 11[default]
10 +2-Ch Secondary w/SPDIF 3 and 4 7 and 8 6 and 9[default]
10 +4-Ch Secondary w/SPDIF 3 and 4 7 and 8 6 and 9 10 and 11[default]
11 +2-Ch Secondary w/SPDIF 3 and 4 7 and 8 6 and 9 10 and 11[default]
Table 31. PCM Front DAC Rate Register (Index 2Ch)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
2Ch PCM Front
DAC Rate
SRF15 SRF14 SRF13 SRF12 SRF11 SRF10 SRF9 SRF8 SRF7 SRF6 SRF5 SRF4 SRF3 SRF2 SRF1 SRF0 BB80h
This read/write Sample Rate Control Register contains 16-bit unsigned value, representing the rate of operation in Hz.
SRF[15:0] Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the sample
rate is reset to 48 kHz.
Table 32. PCM Surround DAC Rate Register (Index 2Eh)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
2Eh PCM
Surr
DAC
Rate
SRS15 SRS14 SRS13 SRS12 SRS11 SRS10 SRS9 SRS8 SRS7 SRS6 SRS5 SRS4 SRS3 SRS2 SRS1 SRS0 BB80h
This read/write Sample Rate Control Register contains 16-bit unsigned value, representing the rate of operation in Hz.
This register sets the sample rate for the surround DAC. This register’s reset default is to be locked to the PCM front DAC sample rate register (2-Ch).
To unlock this register, Bit SRU in Register 76h must be asserted.
SRF[15:0] Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
Table 33. PCM LFE (and CENTER) DAC Rate Register (Index 30h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
30h PCM
LFE/C
DAC
Rate
SRCL15 SRCL14 SRCL13 SRCL12 SRCL11 SRCL10 SRCL9 SRCL8 SRCL7 SRCL6 SRCL5 SRCL4 SRCL3 SRCL2 SRCL1 SRCL0 BB80h
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
This register sets the sample rate for the LFE DAC and Center DAC. This register’s reset default is to be locked to the PCM Front DAC sample rate register (2-Ch)
To unlock the register bit, SRU in Register 76h must be asserted.
SRF[15:0] Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
AD1888
Rev. A | Page 23 of 32
Table 34. PCM ADC Rate Register (Index 32h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
32h PCM L/R
ADC
Rate
SRA15 SRA14 SRA13 SRA12 SRA11 SRA10 SRA9 SRA8 SRA7 SRA6 SRA5 SRA4 SRA3 SRA2 SRA1 SRA0 BB80h
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
SRF[15:0] Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
Table 35. CENTER/LFE Volume Control Register (Index 36h)
Reg
No. Name D15 D14 D131D12 D11 D10 D9 D8 D7 D6 D51D4 D3 D2 D1 D0 Default
36h Center/LFE
Volume
LM X LFE5 LFE4 LFE3 LFE2 LFE1 LFE0 CM X CNT5 CNT4 CNT3 CNT2 CNT1 CNT0 8080h
1 Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 bit is set to 1, its respective lower five volume bits are automatically
set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever this bit is set to 1.
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table 36 for examples. This register controls the LFE output volume and mute bit. The volume registers contain five bits, generating 32 volume levels with 31
steps of 1.5 dB each. If MSPLT is not set, Bit D7 has no effect.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the center and LFE output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the center and LFE DAC gain/attenuators. Range is +12 dB to −34.5 dB.
CNT[5:0] Center Volume Control
CM Center Volume Mute. When this bit is set to 1, the channel is muted.
LFE[5:0] LFE Volume Control
LM LFE Volume Mute. When this bit is set to 1, the channel is muted.
Table 36. Settings for Center/LFE Register
Control Bits
CENTER and LFE Volume (36h)
CENTER D[5:0] and LFE D[13:8]
D15/D7 WRITE READBACK Function with AC97NC = 0 Function with AC97NC = 1
0 00 0000 00 0000 0 dB Gain 12 dB Gain
0 00 1111 00 1111 −22 dB Gain −10.5 dB Gain
0 01 1111 01 1111 −46.5 dB Gain −34.5 dB Gain
0 1x xxxx 01 1111 −46.5 dB Gain Not Applicable
1 xx xxxx xx xxxx Muted Muted
Table 37. Surround Volume Control Register (Index 38h)
Reg
No. Name D15 D14 D131D12 D11 D10 D9 D8 D7 D6 D51D4 D3 D2 D1 D0 Default
38h Surround
Volume
MUTE_L X LSR5 LSR4 LSR3 LSR2 LSR1 LSR0 MUTE_R X RSR5 RSR4 RSR3 RSR2 RSR1 RSR0 8080h
1 Refer to Table 37 for examples. This register controls the surround volume controls for both stereo channels and mute bits. Each volume subregister contains five bits,
generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 Bit is set to
1, its respective lower five volume bits are automatically set to 1 by the coded logic. On readback , all lower five bits will read 1s whenever these bits are set to 1.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the surround output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the surround DAC gain/attenuators. Range is +12 dB to −34.5 dB.
RSR[5:0] Right Surround Volume Control
MUTE_R Right Surround Volume Mute. When this bit is set to 1, the right channel is muted.
LSR[5:0] Left Surround Volume Control
MUTE_L Left Surround Volume Mute. When this bit is set to 1, the left channel is muted.
AD1888
Rev. A | Page 24 of 32
Table 38. Settings for Surround Register
Control Bits
Surround Volume (38h)
Left Surround D[13:8]
Right Surround D[5:0]
D15/D7 WRITE READBACK Function with AC97NC = 0 Function with AC97NC = 1
0 00 0000 00 0000 0 dB Gain 12 dB Gain
0 00 1111 00 1111 −22 dB Gain −10.5 dB Gain
0 01 1111 01 1111 −46.5 dB Gain −34.5 dB Gain
0 1x xxxx 01 1111 −46.5 dB Gain Not Applicable
1 xx xxxx xx xxxx Muted Muted
Table 39. SPDIF Control Register (Index 3Ah)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
3Ah SPDIF
Control
V X SPSR1 SPSR0 L CC6 CC5 CC4 CC3 CC2 CC1 CC0 PRE COPY /AUD PRO 2000h
All registers not shown and bits containing an X are assumed to be reserved.
Register 3Ah is a read/write register that controls SPDIF functionality and manages bit fields propagated as channel status (or subframe in the V case). With the
exception of V, this register should only be written to when the SPDIF transmitter is disabled (SPDIF Bit in Register 2Ah is 0). This ensures that control and status
information starts up correctly at the beginning of SPDIF transmission.
PRO Professional. 1 indicates professional use of channel status, 0 indicates consumer.
/AUD Non-Audio. 1 indicates data is non PCM format, 0 indicates data is PCM.
COPY Copyright. 1 indicates copyright is asserted, 1 indicates copyright is not asserted.
PRE Pre-emphasis. 1 indicates filter pre-emphasis is 50 μs/15 μs, 0 indicates pre-emphasis is none.
CC[6-0] Category Code. Programmed according to IEC standards, or as appropriate.
L Generation Level. Programmed according to IEC standards, or as appropriate.
SPSR[1,0] SPDIF Transmit Sample Rate:
SPSR[1:0] = 00 Transmit Sample Rate = 44.1 kHz
SPSR[1:0] = 01 Reserved
SPSR[1:0] = 10 Transmit Sample Rate = 48 kHz (default)
SPSR[1:0] = 11 Not supported.
V Validity. This bit affects the Validity flag (Bit 28 transmitted in each SPDIF L/R subframe) and enables the SPDIF transmitter to
maintain connection during error or mute conditions.
V = 1 Each SPDIF subframe (L + R) has Bit 28 set to 1. This tags both samples as invalid.
V = 0 Each SPDIF subframe (L + R) has Bit 28 set to 0 for valid data and 1 for invalid data (error condition).
Note that when V = 0, asserting the VFORCE bit (D15) in Register 2Ah (Ext’d Audio Stat/Ctrl) will force the Validity flag low,
marking both samples as valid.
AD1888
Rev. A | Page 25 of 32
Table 40. Jack Sense/Audio Interrupt Status Register (Index 72h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
72h Jack
Sense
JS1
SPRD
JS1
DMX
JS0
DMX
JS
MT2
JS
MT1
JS
MT0
X X JS1
TMR
JS0
TMR
JS1
MD
JS0
MD
JS1
ST
JS0
ST
JS1
INT
JS0
INT
0000h
All register bits are read/write except for JS0ST and JS1ST, which are read only.
JS0INT Indicates Pin JS0 has generated an interrupt. Remains set until the software services JS0 interrupt, i.e., JS0 ISR should clear this
bit by writing a 0 to it. Note that the interrupt to the system is actually an OR combination of this bit and JS1INT. Also, note that
the actual interrupt implementation is selected by the INTS bit (Register 76h).
It is also possible to generate a software system interrupt by writing a 1 to this bit.
JS1INT Indicates Pin JS1 has generated an interrupt. Remains set until the software services JS1 interrupt, i.e., JS1 ISR should clear this
bit by writing a 0 to it. See the JS0INT description for additional details.
JS0ST JS0 STATE. This bit always reports the logic state of the JS0 pin.
JS1ST JS1 STATE. This bit always reports the logic state of the JS1 pin.
JS0MD JS0 Mode. This bit selects the operation mode for the JS0 pin.
0 = Jack Sense Mode (reset default)
1 = Interrupt Mode
JS1MD JS1 Mode. This bit selects the operation mode for the JS1 pin.
0 = Jack Sense Mode (reset default)
1 = Interrupt Mode
JS0TMR JS0 Timer Enable. If this bit is set to a 1, JS0 must be high for greater than 278 ms to be recognized.
JS1TMR JS1 Timer Enable. If this bit is set to a 1, JS1 must be high for greater than 278 ms to be recognized.
JSMT[2,0] JS Mute Enable Selector. These three bits select and enable the Jack Sense muting action (see Table 41).
JS0DMX JS0 Down Mix Control Enable. This bit enables JS0 to control the down-mix function. This function allows a digital mix of six
channels of audio into 2-channel audio. The mix can then be routed to the stereo Line_OUT or HP_OUT jacks. When this bit is
set to 1, JS0 = 1 will activate the down-mix conversion. See the DMIX description in Register 76h. The DMIX bits select the
down-mix implementation type and can also force the function to be activated.
JS1DMX JS1 Down Mix Control Enable. This bit enables 2-channel to 6-channel audio spread function when both Jack Senses are active
(logic state 1).
Note that the SPRD bit can also force the spread function without being gated by the Jack Senses. See this bit’s description in
Register 76h for a better understanding of the spread function.
JS1SPRD JS Spread Control Enable. This bit enables 2-channel to 6-channel audio spread function when both Jack Senses are active
(logic state 1).
Note that the SPRD bit can also force the spread function without being gated by the Jack Senses. See this bit’s description in
Register 76h for a better understanding of the spread function.
AD1888
Rev. A | Page 26 of 32
Table 41. Jack Sense Mute Select (JSMT [2:0])
JS1 JS0 JSMT2 JSMT1 JSMT0 HP OUT LINE OUT C/LFE OUT MONO OUT Notes
NA NA 0 0 0 ACTIVE ACTIVE ACTIVE ACTIVE JS0 and JS1 ignored.
OUT (0) OUT (0) 0 0 1 ACTIVE FMUTE FMUTE ACTIVE
OUT (0) IN (1) 0 0 1 ACTIVE FMUTE FMUTE ACTIVE
IN (1) OUT (0) 0 0 1 ACTIVE ACTIVE ACTIVE ACTIVE
IN (1) IN (1) 0 0 1 ACTIVE ACTIVE ACTIVE ACTIVE
JS0 no mute action,
JS1 mutes mono and enables
LINE_OUT and C/LFE.
Standard 6-channel config.
OUT (0) OUT (0) 1 0 0 ACTIVE FMUTE FMUTE ACTIVE
OUT (0) IN (1) 1 0 0 ACTIVE ACTIVE ACTIVE FMUTE
IN (1) OUT (0) 1 0 0 ACTIVE FMUTE FMUTE FMUTE
IN (1) IN (1) 1 0 0 ACTIVE FMUTE FMUTE FMUTE
JS0 = 0 and JS1 = 0 enables mono.
JS1 = 1 enables front only
JS0 = 1 enables all rear.
6-chan config with front jack
wrapback.
OUT (0) OUT (0) 1 0 1 FMUTE FMUTE FMUTE ACTIVE
OUT (0) IN (1) 1 0 1 FMUTE FMUTE FMUTE FMUTE
IN (1) OUT (0) 1 0 1 ACTIVE ACTIVE ACTIVE FMUTE
IN (1) IN (1) 1 0 1 ACTIVE ACTIVE ACTIVE FMUTE
JS0 no mute action, JS1 mutes
mono and enables LINE_OUT
+ HP_OUT + C/LFE.
Standard 6-channel config.
NA NA 1 1 0 ** ** ** ** ** Reserved
NA NA 1 1 1 ** ** ** ** ** Reserved
NA NA 0 1 1 ** ** ** ** ** Reserved
FMUTE = Output is forced to mute independent of the respective Volume register setting.
ACTIVE = Output is not muted and its status is dependent on the respective Volume register setting.
OUT = Nothing plugged into the jack and therefore the JS status is 0 (via the load resistor pull-down).
IN = Jack has plug inserted and therefore the JS status is 1 (via the codec JS internal pull-up).
AD1888
Rev. A | Page 27 of 32
Table 42. Serial Configuration Register (Index 74h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
74h Serial
Config
SLOT16 REGM2 REGM1 REGM0 REGM3 DRF X CHEN X LBKS1 LBKS0 INTS X SPAL SPDZ SPLNK 1001h
SPLNK SPDIF Link. This bit enables the SPDIF to link with the front DACs for data requesting.
0 = SPDIF and DAC are not linked.
1 = SPDIF and DAC are linked and receive the same data requests (reset default).
SPDZ SPDIF DACZ.
0 = Repeat last sample out of the SPDIF stream if FIFO underruns (reset default).
1 = Forces midscale sample out the SPDIF stream if FIFO underruns.
SPAL SPDIF ADC Loop-Around.
0 = SPDIF transmitter is connected to the AC-Link stream (reset default).
1= SPDIF transmitter is connected to the digital ADC stream, not the AC-Link.
INTS Interrupt Mode Select. This bit selects the JS interrupt implementation path.
0 = Bit 0 SLOT 12 (modem interrupt) (reset default).
1 = Slot 6 Valid Bit (MIC ADC interrupt).
LBKS[1:0] Loop-Back Selection. These bits select the internal digital loop-back path when LPBK bit is active (see Register 20h)
00 = Loop-back through the front DACs (reset default).
01 = Loop-back through the surround DACs.
10 = Reserved
11 = Loop-back through the center and LFE DACs (center DAC loops back from the ADC left channel, the LFE DAC from the ADC
right channel).
CHEN Chain Enable. This bit enables chaining of a slave codec SDATA_IN stream into the ID0 pin (Pin 45).
0 = Disable chaining (reset default).
1 = Enable chaining into ID0 pin.
DRF DAC Request Force. This allows the AD1888 to synchronize DAC requests with the AD1981A/B.
0 = Normal DAC requesting sequence (reset default).
1 = Synchronize to AD1981A/B DAC requests.
REGM3 Slave 3 Codec Register Mask
REGM0 Master Codec Register Mask
REGM1 Slave 1 Codec Register Mask
REGM2 Slave 2 Codec Register Mask
SLOT16 Enable 16-Bit Slot Mode. SLOT16 makes all ac-link slots 16 bits in length, formatted into 16 slots. This is a preferred mode for
DSP serial port interfacing.
AD1888
Rev. A | Page 28 of 32
Table 43. Miscellaneous Control Bit Register (Index 76h)
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
76h Misc
Control
Bits
DACZ AC97NC MSPLT LODIS CLDIS HPSEL DMIX1 DMIX0 SPRD X LOSEL SRU VREFH VREFD MBG1 MBG0 0000h
MBG[1:0] MIC Boost Gain Select Register.
These two bits allow changing the MIC preamp gain from the nominal 20 dB gain. Both MIC1/MIC2 and MIC2 preamps will be
set to the same selected gain.
Note that this gain takes effect only while Bit D6 (M20) on the MIC volume register (0Eh) is set to 1; otherwise, the MIC boost
block has a gain of 0 dB.
00 = 20 dB gain (reset default)
01 = 10 dB gain
10 = 30 dB gain
11 = reserved
VREFD VREFOUT Disable. Disables VREFOUT, placing it into High-Z out mode.
Note that this bit overrides the VREFH bit selection (see below).
0 = VREFOUT pin is driven by the internal reference (reset default).
1 = VREFOUT pin is placed into High-Z out mode.
VREFH VREFOUT High. Changes VREFOUT from 2.25 V to 3.70 V for PC2001 compliant MIC bias applications.
0 = VREFOUT pin is set to 2.25 V output (reset default).
1 = VREFOUT pin is set to 3.70 V output.
SRU Sample Rate Unlock. Controls DAC sample rate locking.
0 = All DAC sample rates are locked to the front sample rate (reset default)
1 = DAC sample rates can be set independently for front, surround, and LFE.
LOSEL LINE_OUT Amplifiers Input Select. This bit allows the LINE_OUT output amplifiers to be driven by the mixer or the surround
DACs. The main purpose for this is to allow swapping of the front and surround channels to make better use of the
SURR/HP_OUT output amplifiers. This bit should normally be used in tandem with the HPSEL bit (see below).
0 = LINE_OUT amplifiers are driven by the mixer outputs (reset default).
1 = LINE_OUT amplifiers are driven by the surround DAC outputs.
SPRD SPREAD Enable. This bit enables spreading of 2-channel media to all six output channels. This function is implemented in the
analog section by using the output selector controls line for the center/LFE, surround, and Line_out output channels. Note that
the Jack Sense pins can also be set up to control (gate) this function, depending on the JSSPRD bit (see Register 72h).
0 = No spreading occurs unless activated by the Jack Senses and JSSPRD bits (reset default).
1 = The SPRD selector drives the center and LFE outputs from the MONO_OUT, the HPSEL selector drives the SURR/HP_OUT
outputs from the mixer outputs, and the LOSEL selector drives the LINE_OUT outputs also from the mixer outputs.
Note that the SPRD bit overrides the current output selector control lines set up by bits LOSEL and HPSEL as follows: LOSEL = 0
and HPSEL = 1.
AD1888
Rev. A | Page 29 of 32
DMIX[1:0] Down Mix Mode Select. Provides analog down-mixing of the center, LFE, and/or surround channels into the mixer channels.
This allows the full content of 5.1 or quad media to be played through stereo headphones or speakers.
Note that the Jack Sense pins can also be set up to control (gate) this function depending on the JS0DMX and JS1DMX Bits (see
Register 72h).
The upper bit allows forcing the down-mix function:
DMIX[1] = 0, no down-mix unless activated by the Jack Sense and JSxDMX bits (default).
DMIX[1] = 1, forces down-mix function.
The lower bit selects the down-mix type:
DMIX[0] = 0, selects 6-to-4 down-mix. The center and LFE channels are summed equally into the mixer left and right channels
(default).
DMIX[0] = 1, selects 6-to-2 down-mix. The surround left and right channels are summed into the mixer left and right channels.
Default for DMIX[1:0] is 00.
HPSEL Headphone Amplifier Input Select. This bit allows the headphone power amps to be driven from the surround DACs or from
the mixer outputs. There are two reasons for this: one is to allow 2-channel media to use the higher power headphone
amplifiers available on the SURR/HP_OUT outputs; the other is to allow spreading of 2-channel media to the surround outputs.
Together with the LOSEL bit (see above), this bit also provides for analog swapping of the mixer (front) and surround outputs.
0 = SURR_OUT/HP_OUToutputs are driven by the surround DACs (reset default).
1 = SURR_OUT/HP_OUToutputs are driven by the mixer outputs.
CLDIS Center and LFE Disable. Disables the center and LFE output pins, placing them into High-Z mode so that the assigned output
audio jack(s) can be shared for MIC inputs or other functions.
0 = Center and LFE output pins have normal audio drive capability (reset default).
1 = Center and LFE output pins are placed into High-Z mode.
LODIS Line_out Disable. Disables the Line_out pins (L/R), placing them into High-Z mode so that the assigned output audio jack can
be shared for Line Input function.
0 = Line_out pins have normal audio drive capability (reset default).
1 = Line_out pins are placed into High-Z mode.
MSPLT Mute Split. Allows separate mute control bits for master, HP, Line_in, CD, PCM OUT, and record volume/gain control registers.
0 = Both left and right channel mutes are controlled by Bit D15 in the respective registers (reset default).
1 = Bit D15 affects only the left channel mute and Bit D7 affects only the right channel mute.
AC97NC AC ’97 No Compatibility Mode. This bit allows the surround, center, and LFE volume control registers and output attenuators to
operate in a more functional mode than defined by the AC97 2.2 spec. This is called ADI compatibility mode.
In AC ’97 compatibility mode, the DAC gain/attenuators for the surround, center, and LFE are controlled by Register 18h (PCM
volume). The output pin attenuators for the surround are controlled by Register 38h, and the output pin attenuators for the
center and LFE are controlled by Register 36h.
In ADI compatibility mode, the Surround DAC gain/attenuators are controlled by Register 38h, and the Center/LFE DACs are
controlled by Register 36h.
The output pin attenuators for Center/LFE are controlled by Register 02h (Master Volume), and the output pin attenuators for
Surround are controlled by Register 04h.
0 = AC97 compatibility mode (reset default).
1 = ADI compatibility mode.
DACZ DAC Zero-Fill. Determines DAC data fill under starved condition.
0 = DAC data is repeated when DACs are starved for data (reset default).
1 = DAC data is zero-filled when DACs are starved for data.
AD1888
Rev. A | Page 30 of 32
Table 44. Vendor ID Register (Index 7Ch–7Eh)
Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
7Ch Vendor ID1 F7 F6 F5 F4 F3 F2 F1 F0 S7 S6 S5 S4 S3 S2 S1 S0 4144h
S[7:0] This register is ASCII encoded to A.
F[7:0] This register is ASCII encoded to D.
Reg
No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
7Eh Vendor
ID2
T7 T6 T5 T4 T3 T2 T1 T0 REV7 REV6 REV5 REV4 REV3 REV2 REV1 REV0 5368h
T[7:0] This register is ASCII encoded to S.
REV[7:0] This register is set to 68h identifying the AD1888.
Table 45. Codec ID and Clock Selection Table
XTL_IN ID1# ID0# Codec ID Codec Clocking Source
GND 0 0 SECONDARY, ID = 3 12.288 MHz (BIT_CLK from Primary Codec)
GND 0 1 SECONDARY, ID = 2 12.288 MHz (BIT_CLK from Primary Codec)
GND 1 0 SECONDARY, ID = 1 12.288 MHz (BIT_CLK from Primary Codec)
XTAL into XTL_IN 1 1 PRIMARY, ID = 0 24.576 MHz Local XTAL or External CLK
CLK INPUT 0 0 PRIMARY, ID = 0 14.3181 MHz (External into XTL_IN)
CLK INPUT 0 1 PRIMARY, ID = 0 48.00 MHz (External into XTL_IN)
CLK INPUT 1 X RESERVED RESERVED
Note that internally, the ID pins have weak pull-ups and are inverted.
AD1888
Rev. A | Page 31 of 32
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MS-026-BBC
TOP VIEW
(PINS DOWN)
1
12 13 25
24
36
37
48
0.27
0.22
0.17
0.50
BSC
LEAD PITCH
7.00
BSC SQ
1.60
MAX
0.75
0.60
0.45
VIEW A
9.00
BSC SQ
PIN 1
0.20
0.09
1.45
1.40
1.35
0.08 MAX
COPLANARITY
VIEW A
ROTATED 90° CCW
SEATING
PLANE
7°
3.5°
0°
0.15
0.05
Figure 11. 48-Lead Low Profile Quad Flat Package [LQFP]
(ST-48)
Dimensions shown in millimeters
PIN 1
INDICATOR
TOP
VIEW 6.75
BSC SQ
7.00
BSC SQ
1
48
12
13
37
36
24
25
5.25
5.10 SQ
4.95
0.50
0.40
0.30
0.30
0.23
0.18
0.50 BSC
12° MAX
0.20REF
0.80 MAX
0.65 TYP
1.00
0.85
0.80
5.50
REF
0.05 MAX
0.02 NOM
0.60 MAX
0.60 MAX PIN 1
INDICATOR
COPLANARITY
0.08
SEATING
PLANE
0.25 MIN
EXPOSED
PAD
(BOTTOM VIEW)
COMPLIANT TO JEDEC STANDARDS MO-220-VKKD-2
Figure 12. 48-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
7 mm × 7 mm Body, Very Thin Quad (CP-48-1)
Dimensions shown in millimeters
ORDERING GUIDE
Model Temperature Range Package Description Package Option
AD1888JST 0°C to 70°C 48-Lead LQFP, Tray Version ST-48
AD1888JST-REEL 0°C to 70°C 48-Lead LQFP, Reel Version ST-48
AD1888JSTZ10°C to 70°C 48-Lead LQFP, Tray Version ST-48
AD1888JSTZ-REEL10°C to 70°C 48-Lead LQFP, Reel Version ST-48
AD1888JCP 0°C to 70°C 48-Lead LFCSP_VQ, Tray Version CP-48-1
AD1888JCP-REEL 0°C to 70°C 48-Lead LFCSP_VQ, Reel Version CP-48-1
AD1888JCPZ1 0°C to 70°C 48-Lead LFCSP_VQ, Tray Version CP-48-1
AD1888JCPZ-REEL10°C to 70°C 48-Lead LFCSP_VQ, Reel Version CP-48-1
1 Z = Pb-free part.
AD1888
Rev. A | Page 32 of 32
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NOTES
©2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C04294–0–8/05(A)
TTT
