Advance Product Note
Jan ua ry 2000
LU97—AC-Link Soft Modem Chip Se t
Features
■
Operating system support:
—
Windows
* 95, 98, 2000
— PC ‘99 compliant
— ACPI compliant
■
High-speed data mode capabilities:
— ITU-T V.90 data rates 28000 bits/s—
56000 bits/s
†
— Ultrahigh compression throughput due to paral-
lel access directly to the host PC
— ITU-T V.34 e xtended rates: 33600 bits/s—
2400 bits/s V.32terbo, V.32bis, and fallbacks
— TIA/
EIA
§
602 standard for AT command set
— V.42 error correction (LAPM and
MNP
‡
)
— V.42bis and
MNP
Class 5 data compression
■
FAX mode capabilities:
— ITU-T V.17, V.29, V.27ter, and V.21 Ch 2
— TIA/
EIA
578 Class 1 FAX
■
Video-ready modem interface (VRM) V.80
■
Complete DAA includes the following:
— AC‘97/MC‘97 2.1 compliant
— International line interface
— Compliant with FCC, CTR21, JATE, and other
PTTs
— 3.3 V to 5 V power supply
— 2400 V isolation
— Integrated ring detector
— Integrated analog front end (AFE)
— 2-wire to 4-wire hybrid
— Low-power standby mode
— Low-profile SOIC packages
■
Applications:
— Modem riser cards
— Mobile daughter cards
*
Windows
and
Windows NT
are registered trademarks of
Microsoft Corporation.
†Actual speeds over U.S. telephone lines vary and are less than
56K, due to current FCC regulations and lin e conditions.
‡
MNP
is a registered trademark of Microcom, Inc.
§
EIA
is a registered trademark of Electronic Industries Associa-
tion.
Introduction
The Lucent Technologies LU97 chip set is an inte-
grated direct access arrangement (DAA) chip set that
provides a low-cost, isolated, silicon-based MC‘97
compliant interface to the telephone line. The chip set
saves cost and board area by eliminating the need
for a modem AFE or serial codec. It also eliminates
the need for an isolation transformer, relays, optoiso-
lators, and a 2-wire to 4-wire hybrid. The LU97 chip
set complies with AC‘97/MC‘97 Interface Specifica-
tion Rev. 2.1.
The chip set is fully programmable to meet worldwide
telephone line interface requirements, including
those described by CTR21, JATE, FCC, and various
country-specific PTT specifications. The programma-
ble parameters of the LU97 chip set include ac termi-
nation, dc termination, ringer impedance, and ringer
threshold. The LU97 chip set has been designed to
meet stringent worldwide requirements for out-of-
band energy, billing-tone immunity, lightning surges,
and safety requirements.
The LU97 chip set achieves an isolation barrier
through low-cost, high-voltage capacitors in conjunc-
tion with Lucent’s proprietary signal processing tech-
niques. These techniques eliminate any signal
degradation due to capacitor mismatches, common-
mode interference, or noise coupling. All transmit,
receive, control, and ring detect data are communi-
cated through this barrier.
The LU97 chip set is available in two 16-pin small
outline packages with an AC‘97 interface on the
CSP1037 and a telephone line interface on the
CSP1037A/B. The CSP1037A is designed for
domestic DAAs, while the CSP1037B is for interna-
tional DAAs.
2Lucent Technologies Inc.
Ad vance Product Note
January 2000
LU97—AC-Link Soft Modem Chip Set
Functional Description
Figure 1. Functional Block Diagram
The LU97 chip set is an integrated direct access arrangement (DAA) that provides a programmable line interface to
meet international telephone line requirements. The LU97 chip set is availab le in two 16-pin small outline packages
(AC‘97 interface on CSP1037 and telephone line interface on CSP1037A/B). The chip set eliminates the need for
an AFE, an isolation transformer, relays, optoisolators, and a 2-wire to 4-wire hybrid. The LU97 chip set dramati-
cally reduces the number of discrete components and cost required to achieve compliance with international regu-
latory requirements. The CSP1037 complies with AC‘97/MC‘97 Interface Specification Rev. 2.1.
The chip set is fully programmable to meet worldwide telephone line interface requirements, including those
described by CTR21, JATE, FCC, and v arious country-specific PTT specifications. The programmable parameters
of the LU97 chip set include ac termination, dc termination, ringer impedance, and ringer threshold. The LU97 chip
set has been designed to meet stringent worldwide requirements for out-of-band energy, billing-tone immunity,
lightning surges, and safety requirements.
The LU97 chip set achieves an isolation barrier through low-cost, high-voltage capacitors in conjunction with
Lucent’s proprietary signal processing techniques. These techniques eliminate any signal degradation due to
capacitor mismatches, common-mode interference, or noise coupling. All transmit, receive, control, and ring detect
data are communicated through this barrier.
5-8164 (F)
CLOCK
AC‘97
DIGITAL
INTERFACE
CONTROL
INTERFACE
ISOLATION
INTERFACE
HYBRID
AND
dc
RING DETECT
OFF-HOOK
ISOLATION
INTERFACE
TERMINATION
XOUT
MCLK/XIN
RESET
BIT_CLK
SYNC
SDATA_IN
SDATA_OUT
ID0
ID1
GPIO_A
GPIO_B
RX
FILT
FILT2
REF
DCT
VREG
VREG2
REXT
REXT2
RNG1
RNG2
QB
QE
QE2
CSP1037 CSP1037A/B
Lucent Technologies Inc. 3
Advance Product Note
January 2000 LU97—AC-Link Soft Modem Chip Set
Pin Information
CSP1037 Pin Informatio n
Figure 2. CSP1037 Pin Locations, 16-Pin SOIC
Table 1. CSP1037 Pin Locations, 16-Pin SOIC
CSP1037 Serial Interface Signals
Table 2. CSP1037 Serial Interface Signal Descriptions
Pin Name Type Pin Name Type Pin Name Type Pin Name Type
1 MCLK/XIN I 5 SDATA_IN O 9 AOUT O 13 VAP
2 XOUT O 6 SDATA_OUT I 10 ID0 I 14 ID1 I
3 BIT_CLK I/O 7 SYNC I 11 C1A —15GPIO_BI/O
4V
DP 8 RESET I 12 GND P 16 GPIO_A I/O
Signal Description
BIT_CLK Serial Port Bit Clock Output/Input. Controls the serial data on SDATA_IN and latches the
data on SDATA_OUT. Output when configured as primary device. Input when configured as
seco nda ry device.
SDATA_IN Serial Port Data Out. Serial communication and control data that is generated by the digital
A C‘97 controller and presented as an input to the CSP1037.
SDATA_OUT Serial Port Data In. Serial communication and status data that is provided by the CSP1037
to the digital AC‘97 controller.
SYNC Frame Sync Input. Data framing signal that is used to indicate the start and stop of a
communication data frame.
RESET Reset Input (Active-Low). An active-low input that is used to reset all control registers to a
defined, initialized state. Also used to bring the LU97 chip set out of sleep mode.
5-8163 (F)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MCLK/XIN
XOUT
BIT_CLK
VD
SDATA_IN
SDATA_OUT
SYNC
RESET
GPIO_A
GPIO_B
ID1
VA
GND
C1A
ID0
AOUT
CSP1037
4Lucent Technologies Inc.
Ad vance Product Note
January 2000
LU97—AC-Link Soft Modem Chip Set
Pin Information (continued)
CSP1037 Miscellaneous Signals
Table 3. CSP1037 Miscellaneous Signal Descriptions
CSP1037 Power Signals
Table 4. CSP1037 Power Signal Descriptions
CSP1037A/B Pin Information
Figure 3. CSP1037A/B Pin Locations, 16-Pin SOIC
Table 5. CSP1037A/B Pin Locations, 16-Pin SOIC
Signal Description
ID0 Device ID Bit 0. Bit 0 of the device configuration.
ID1 Device ID Bit 1. Bit 1 of the device configuration.
AOUT Analog Speaker Output. Provides an analog output signal for driving a call progress speaker.
C1A Isolation Capacitor 1A. Connects to one side of the isolation capacitor C1.
MCLK/XIN Master Clock Input/Crystal Input.
XOUT Crystal Output.
GPIO_A General- Purpose I/O A. Programmable via registers 4Ch—54h. Default input.
GPIO_B General- Purpose I/O B. Programmable via registers 4Ch—54h. Def ault input.
Signal Description
VDDigital Supply Voltage. Provides the digital supply voltage to the CSP1037. Nominally either
3.3 V or 5 V.
VAAnalog Supply Voltage. Provides analog supply voltage for the CSP1037. Nominally 5 V.
GND Ground. Connects to the system digital ground. Also connects to capacitor C2.
Pin Name Pin Name Pin Name Pin Name
1 QE2 5 RNG1 9 VREG 13 REXT
2 DCT 6 RNG2 10 VREG2 14 RX
3 IGND 7 QB 11 REF 15 FILT
4 C1B 8 QE 12 REXT2 16 FILT2
5-8165
(
F
)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
QE
FILT2
FILT
RX
REXT
REXT2
REF
VREG2
VREG
CSP1037A/B
Lucent Technologies Inc. 5
Advance Product Note
January 2000 LU97—AC-Link Soft Modem Chip Set
Pin Information (continued)
CSP1037A/B Line Interface Signals
Table 6. CSP1037A/B Line Interface Signal Descriptions
CSP1037A/B Isolation Signals
Table 7. CSP1037A/B Isolation Signal Descriptions
CSP1037A/B Miscellaneous Signals
Table 8. CSP1037A/B Miscellaneous Signal Descriptions
Signal Description
FILT Filter. Sets the time constant for the dc termination circuit.
FILT2 Filter 2. Sets the time constant for the dc termination circuit.
RX Receive Input. Serves as the receive side input from the telephone network.
DCT dc Termination. Provides dc termination to the telephone network.
REXT External Resistor. Sets the real ac termination impedance.
REXT2 External Resistor 2. Sets the complex ac termination impedance.
RNG1 Ring 1. Connects through a 2200 pF capacitor to the tip lead of the telephone line. Provides
the ring and signals to the CSP1037A/B.
RNG2 Ring 2. Connects through a 2200 pF capacitor to the ring lead of the telephone line. Provides
the ring and signals to the CSP1037A/B.
QB Transistor Base. Connects to the base of transistor Q3.
QE Transistor Emitter. Connects to the emitter of transistor Q3.
QE2 Transistor Emitter 2. Connects to the emitter of transistor Q4.
REF Reference. Connects to an external resistor to provide a high-accuracy reference current.
Signal Description
C1B Isolation Capacitor 1B. Connects to one side of isolation capacitor C1.
IGND Isolated Gro und. Connects to ground on the line-side interface. Also connects to capacitor C2.
Signal Description
VREG Voltage Regulator . Connects to an external capacitor to provide bypassing for an internal voltage.
VREG2 Voltage Regulator 2. Connects to an external capacitor to provide bypassing fo r an internal
power supply.
6Lucent Technologies Inc.
Ad vance Product Note
January 2000
LU97—AC-Link Soft Modem Chip Set
Package Outline Diagram
LU97 16-Pin Small-Outline Pac kage
Dimensions are in millimeters.
Ordering Information
Table 9. LU97 Ordering Information
Device Package Comcode
CSP1037 16-pin, small-outline 108500117
CSP1037A 16-pin, small-outline 108500091
CSP1037B 16-pin, small-outline 108500109
0.10
SEATING PLANE
16 9
9.80/10.01
3.90 ± 0.10
DETAIL A
0.40/1.27
GAGE PLANE
SEATI NG PLANE
1.07 REF
0.010 0.19/0.25
SEE DETAIL A
18
6.00 ± 0.20
1.35/1.75
1.27
1.40 ± 0.10
0.10/0.25
0.33/0.51
5-8994 (F)
Lucent Technologies Inc. 7
Advance Product Note
January 2000 LU97—AC-Link Soft Modem Chip Set
Notes
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. N o liability is assumed as a result of thei r use or application. No
rights under any patent accompany the sale of any such product(s) or inform ation.
Copyright © 2000 Lucent Technologies Inc.
All Rights Reserved
Printed in U.S.A.
Jan uary 2000
PN99-096DMOD
For additional information, contact your Microelectronics Group Account Manager or the following:
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