AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
1
高效率、低噪声、大音量、Multi-Level AGC 第八代 K类音乐功放
特性
Multi-Level AGC 算法，有效消除杂音，纯净音质
低噪声：40μV
超低失真度：0.008%
整体效率高达 83%
喇叭保护功率可配：0.6W、0.8W、1W 和1.2W
锂电池电压范围内，保持恒定大音量
支持 6欧姆喇叭
兼容 AW8736，AW8737
超强 TDD-Noise 抑制
优异的 pop-click 抑制
一线脉冲控制
高PSRR：-68dB（217Hz）
ESD 保护：±8kV (HBM)
纤小的 2mm×2mm FC-16 封装
应用
智能手机
概要
AW8738 是专门针对消除智能机音乐杂音，提升整
体音质而开发的高效率，低噪声，恒定大音量的第八代
K类音乐功放。AW8738 集成艾为专有的 Multi-Level
AGC 音效算法，有效消除音乐播放中的杂音，同时提
升 音 质 音 量 。 AW8738 采用效率高达 93% 的
K-Chargepump 电荷泵升压技术，使功放整体效率高达
83%；AW8738 的底噪低至 40μV，具有高达 99.6dB
的信噪比(SNR)，0.008%的超低失真度和独特的
Multi-Level AGC 技术，带来高品质的音乐享受。
AW8738 有0.6W，0.8W，1W 和1.2W 四个喇叭
保护功率等级，适合不同额定功率的喇叭，即大大提升
音质音量，又有效保护喇叭，同时配合 Multi-Level AGC
算法，使音乐纯粹自然，悦耳动听。AW8738 兼容
AW8736，AW8737，输出功率不会随着锂电池电压的
降低而下降，在手机的整个工作电压（3.3V-4.35V）内，
功率保持恒定，防止手机使用过程中，声音越来越小。
AW8738 采用艾为专有的 TDD-Noise 抑制和 EMI
抑制技术，有效抑制 TDD-Noise 和EMI 干扰。
AW8738 内置过流保护、过热保护和短路保护功
能，有效地保护芯片。AW8738采用纤小的 2mm×2mm
FC-16 封装。
典型应用图
C1P
AW8738
C1N
COUT
4.7uF
10V
PVDD
INP
INN
3KΩ
33nF
3KΩ
33nF
Cin
Cin Rin
Rin
VOP
VON
GND
VDD
SHDN
Pulse Input
1 2
CF1
2.2uF
CS1
4.7uF
VBAT
34
Cd
220pF
A4
A2
A1
C2,C3,C4
B4
D4
B1
B2
C2
1nF
C3
1nF
D3
A3,B3 D2 C1 C2P C2N
CF2
2.2uF
B1,B2D1
CS2
0.1uF
单端输入
56 7
图 1 AW8738 单端输入方式应用图
手册中提到的全部商标所有权归各自拥有者所有。
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
2
High efficiency、Low noise、Constant large volume、Multi-level AGC
Eighth generation Class K Audio Amplifier
FEATURES
Multi-Level AGC audio algorithm ，effectively
eliminate noise, make sound pure natural
Low noise：40μV
Ultra-low distortion：0.008%
Power amplifier overall efficiency is up to 83%
Selectable speaker-guard power level：0.6W、0.8W、
1W、1.2W
Within Lithium battery voltage range, maintained
constant large volume
Support 6ohm speaker
Compatible with AW8736，AW8737
Super TDD-Noise suppression
Excellent pop-click suppression
One wire pulse control
High PSRR：-68dB（217Hz）
ESD protection：±8kV (HBM)
Small 2mm×2mm FC-16package
APPLICATIONS
Smart phone
DESCRIPTION
AW8738 is specifically designed to eliminate smart
mobile phone music noise, to enhance overall sound
quality, which is a new high efficiency, low noise,
ultra-low distortion, constant large volume, eighth
generation class K audio amplifiers. AW8738 integrated
Awinic proprietary multi-level AGC audio algorithm,
effectively eliminate music noise, improve sound
quality and volume. Using a new generation 93%
efficiency K-Chargepump, power amplifier‟s overall
efficiency reaches 83%, greatly prolong the mobile
phone usage time. AW8738 noise floor is as low as to
40uV, with 99.6dB high signal-to-noise-ratio(SNR). The
ultra-low distortion 0.008% and unique multi-level AGC
technology brings high quality music enjoyment.
AW8738 has 0.6W, 0.8W, 1W and 1.2W four selectable
speaker-guard output power levels, which is suitable for
different rated power speakers, greatly improve the
volume, effectively protect speakers. With multi-level
AGC audio algorithms, the music is pure natural and
melodious. AW8738 is compatible with AW8736,
AW8737, output power cannot drop along with lithium
battery voltage lower down. Within lithium battery
voltage range(3.3V-4.35V), output power is constant.
The AW8738 uses Awinic proprietary TDD-Noise
suppression technology and EMI suppression
technology, effectively restrain TDD-Noise and EMI
interference.
AW8738 built-in over current protection,
over-temperature protection and short circuit protection
function, effectively protect the chip. The AW8736 uses
small 2mmx2mm FC-16 package.
APPLICATION DIAGRAM
C1P
AW8738
C1N
COUT
4.7uF
10V
PVDD
INP
INN
3KΩ
33nF
3KΩ
33nF
Cin
Cin Rin
Rin
VOP
VON
GND
VDD
SHDN
Pulse Input
1 2
CF1
2.2uF
CS1
4.7uF
VBAT
34
Cd
220pF
A4
A2
A1
C2,C3,C4
B4
D4
B1
B2
C2
1nF
C3
1nF
D3
A3,B3 D2 C1 C2P C2N
CF2
2.2uF
B1,B2D1
CS2
0.1uF
Single-Ended
Input
56 7
Figure1 AW8738 application diagram
All trademarks are the property of their respective owners.
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
3
PIN CONFIGURATION ANG TOP MARK
AW8738FCR TOP VIEW
INP INN SHDN
GND
PVDD
C2N C2N
C2P C1P
C1N
VDD
VDD
VOP
VON
GND
12 3 4
A
B
C
D
GND
12 3 4
A
B
C
D8738
XXXX
AW8738FCR MARKING
8738 – AW8738FCR
XXXX–Production tracking code
Please notice the pin number
Figure 2 AW8738FCR pin diagram top view and device marking
PIN DESCRIPTION
Number
Symbol
Description
A1
INP
Positive audio input terminal
A2
INN
Negative audio input terminal
A3，B3
VDD
Power supply
A4
SHDN
Chip power down pin，active low；one wire pulse control；
B1
C2N
Negative side of the external charge pump flying capacitor C2
B2
B4
VOP
Positive audio output terminal
C1
C1N
Negative side of the external charge pump flying capacitor C1
C2
GND
Ground
C3
C4
D1
C2P
Positive side of the external charge pump flying capacitor C2
D2
C1P
Positive side of the external charge pump flying capacitor C1
D3
PVDD
Boost charge pump output voltage
D4
VON
Negative audio output terminal
AWINIC CLASS K FAMILY
ITEM
TEST CONDITION
AW8736
AW8737
AW8738
PVDD(V)
VDD>3.8V(AW8736)，VDD>4V(AW8737/8738)
5.8
6.05
6.05
Ouput noise(μV)
VDD=4.2V，f=20Hz to 20kHz，input ac grounded，
8V/V,A-weighting
125
52
40
Efficiency(%)
VDD=3.6V，Po=1.0W，RL=8Ω+33μH
75
80
83
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
4
FUNCTIONAL DIAGRAM
INN
INP
Class-K
Modulator
Ultra Low
EMI
output
stage
SHDN
NCN
GND
OSC
VOP
VON
K-Chargepump
SHDN&BIAS
C1P C2P
PVDD
VDD
INPUT
BUFFER
SEGMENTED
OTP
Noise
Cancellor
C1N C2N
OCP
OVP
Current
Limit
AW8738
Multi-level
AGC
Figure 3 AW8738 functional diagram
APPLICATION DIAGRAM
C1P
AW8738
C1N
COUT
4.7uF
10V
PVDD
INP
INN
3KΩ
33nF
3KΩ
33nF
Cin
Cin Rin
Rin
VOP
VON
GND
VDD
SHDN
Pulse Input
1 2
CF1
2.2uF
CS1
4.7uF
VBAT
34
Cd
220pF
A4
A2
A1
C2,C3,C4
B4
D4
B1
B2
C2
1nF
C3
1nF
D3
A3,B3 D2 C1 C2P C2N
CF2
2.2uF
B1,B2D1
CS2
0.1uF
Single-Ended
Input
56 7
Figure 4 AW8738 single-ended input application diagram (Note 1)
Note1
：
when single-ended input
，
input audio signal can arbitrarily connect to one of INN
，
INP input terminal
，
the other
terminal connects to ground through input capacitor and resistance.
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
5
C1P
AW8738
C1N
COUT
4.7uF
10V
PVDD
INP
INN
3KΩ
33nF
3KΩ
33nF
Cin
Cin Rin
Rin
VOP
VON
GND
VDD
SHDN
CF1
2.2uF
CS1
4.7uF
VBAT
Cd
220pF
A4
A2
A1
C2,C3,C4
B4
D4
B1
B2
C2
1nF
C3
1nF
D3
A3,B3 D2 C1 C2P C2N
CF2
2.2uF
B1,B2D1
CS2
0.1uF
Differential
Input
Pulse Input
1234 5 6 7
Figure 5 AW8738 differential input application diagram
ORDERING INFORMATION
Product Type
Operation temperature range
Package
Device Marking
Delivery Form
AW8738FCR
-40℃～85℃
FC-16
8738
Tape and Reel
3000 pcs
AW8738
Shipment
R: Tape & Reel
Package type
FC: FC16
ABSOLUTE MAXIMUM RATING(Note2)
Parameter
Range
Supply Voltage VDD
-0.3V to 6V
INP，INN Input Pin Voltage
-0.3V to VDD+0.3V
Package Thermal Resistance θJA
69℃/W
Ambient Temperature Range
-40℃ to 85℃
Maximum Junction Temperature TJMAX
125℃
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
6
Storage Temperature Range TSTG
-65℃ to 150℃
Lead Temperature（Soldering 10 Seconds）
260℃
ESD Rating（Note 3）
HBM（human body model）
±8KV
Latch-up
Test Condition：JEDEC STANDARD NO.78B DECEMBER 2008
+IT：450mA
-IT：-450mA
Note 2
：
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damageto the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated
under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended
periods may affect device reliability.
Note 3
：
The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Test method:
MIL-STD-883G Method 3015.7
MODE DESCRIPTION(TA=25℃,VDD=4.2V)
AW8738 audio amplifier outer input capacitor is Cin，outer input resist is Rin，inner input resist is 6.6KΩ，gain
Av is 159.5K/(Rin+6.6K). Recommended typical application is：
1、 Cin=33nF，Rin=3KΩ，Av=16.6V/V；
MODE
Enable Signal
Gain
（V/V）
NCN Power（W）
NCN
function
Multi-Level
AGC
function
RL=8Ω+
33μH
RL=6Ω+
33μH
RL=4Ω+
15μH
RL=3Ω+
15μH
MODE1
16.6
1.2
—
2.4
—
√
MODE 2
16.6
1
—
2
—
√
MODE 3
16.6
0.8
1
1.6
2
√
MODE 4
16.6
0.6
0.8
1.2
1.6
√
MODE 5
16.6
0.8
1
1.6
2
√
MODE 6
16.6
0.6
0.8
1.2
1.6
√
MODE 7
16.6
1.83W@
THD=1%
2.25W@
THD=1%
2.6W@
THD=1%
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
7
ELECTRICAL CHARACTERISTICS
Test condition：TA=25℃, VDD=3.6V，RL=8Ω+33μH，f=1kHz（unless otherwise noted）
Parameter
Test conditions
Min
Typ
Max
Units
VDD
Power supply voltage
3.0
5.5
V
VIH
SHDN
high input voltage
1.3
VDD
V
VIL
SHDN
low input voltage
0
0.35
V
|VOS|
Output offset voltage
Vin=0V，VDD=3.0V to 5.5V
-30
0
30
mV
ISD
Shutdown current
VDD=3.6V，
SHDN
=0V
1
μA
TTG
Thermal AGC start temperature
threshold
150
℃
TTGR
Thermal AGC exit temperature
threshold
130
℃
TSD
Over temperature protection
threshold
160
℃
TSDR
Over temperature protection
recovery threshold
120
℃
TON
Start-up time
40
ms
K-Chargepump
PVDD
Output voltage
VDD =3.0V to 4.0V
1.5*
VDD
V
VDD >4V
6.05
V
Vhys
OVP hysteresis
VDD >4V
50
mV
FCP
Charge Pump frequency
VDD=3.0V to 5.5V
0.8
1.06
1.33
MHz
ηCP
Charge pump efficiency
VDD=4.2V, Iload=200mA
93
%
TST
Soft-start time
No load，COUT=4.7μF
1
1.2
1.4
ms
IL
Current limit when PVDD short
to ground
350
mA
Class K power amplifier（mode1-mode4）
Iq
Quiescent current
VDD=3.6V，Vin=0，no load
12
mA
η
Efficiency
VDD=3.6V，Po=1.0W，RL=8Ω+33μH
83
%
VDD=3.6V，Po=1.0W，RL=6Ω+33μH
84
%
Fosc
Modulation frequency
VDD=3.0V to 5.5V
600
800
1000
kHz
Av
gain
Outside input resistance=3kΩ
16.6
V/V
Vin
Recommend input voltage
VDD=3.0V to 5.5V
1
Vp
Rini
Inner input resistance
6.6
kΩ
Pncn
Mode1 NCN output power
VDD=4.2V，RL=8Ω+33μH
1.2
W
VDD=4.2V，RL=4Ω+15μH
2.4
W
Mode2 NCN output power
VDD=4.2V，RL=8Ω+33μH
1
W
VDD=4.2V，RL=4Ω+15μH
2
W
Mode3 NCN output power
VDD=4.2V，RL=8Ω+33μH
0.8
W
VDD=4.2V，RL=6Ω+33μH
1
W
VDD=4.2V，RL=4Ω+15μH
1.6
W
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
8
Parameter
Test conditions
Min
Typ
Max
Units
Pncn
Mode4 NCN output power
VDD=4.2V，RL=8Ω+33μH
0.6
W
VDD=4.2V，RL=6Ω+33μH
0.8
W
VDD=4.2V，RL=4Ω+15μH
1.2
W
Mode5 Multi-level AGC output
power
VDD=4.2V，RL=8Ω+33μH
0.8
W
VDD=4.2V，RL=6Ω+33μH
1
W
VDD=4.2V，RL=4Ω+15μH
1.6
W
Mode6 Multi-level AGC output
power
VDD=4.2V，RL=8Ω+33μH
0.6
W
VDD=4.2V，RL=6Ω+33μH
0.8
W
VDD=4.2V，RL=4Ω+15μH
1.2
W
PSRR
Power supply rejection ratio
VDD=4.2V，Vp-p_sin=200mV
217Hz
-68
-58
dB
1kHz
-68
-58
dB
SNR
Signal-to-noise ratio
VDD=4.2V，Po=1.83W，THD=1%，RL=8Ω+33μH,
Av=8V/V
99.6
dB
VDD=4.2V，Po=2.25W，THD=1%，RL=8Ω+33μH，
Av=8V/V
99.3
dB
Vn
Output noise voltage
VDD=4.2V，f=20Hz to 20kHz，input
ac grounded，Av=8V/V
A-weighting
40
μVrms
VDD=4.2V，f=20Hz to 20kHz，input
ac grounded，Av=12V/V
45
μVrms
VDD=4.2V，f=20Hz to 20kHz，input
ac grounded，Av=16V/V
56
μVrms
THD+N
Total harmonic distortion+noise
VDD=4.2V,Po=1W,RL=8Ω+33μH,f=1kHz,Mode7
0.008
%
VDD=4.2V,Po=1.2W,RL=8Ω+33μH,f=1kHz,Mode7
0.009
%
PO
Mode4 output power
THD+N=10%，f=1kHz，RL=8Ω+33μH，VDD=4.2V
2.3
W
THD+N=1%，f=1kHz，RL=8Ω+33μH，VDD=4.2V
1.83
W
THD+N=10%，f=1kHz，RL=8Ω+33μH，VDD=3.6V
1.6
W
THD+N=1%，f=1kHz，RL=8Ω+33μH，VDD=3.6V
1.35
W
THD+N=10%，f=1kHz，RL=6Ω+33μH，VDD=4.2V
2.77
W
THD+N=1%，f=1kHz，RL=6Ω+33μH，VDD=4.2V
2.25
W
THD+N=10%，f=1kHz，RL=6Ω+33μH，VDD=3.6V
2.05
W
THD+N=1%，f=1kHz，RL=6Ω+33μH，VDD=3.6V
1.63
W
THD+N=10%，f=1kHz，RL=4Ω+15μH，VDD=4.2V
3.2
W
THD+N=1%，f=1kHz，RL=4Ω+15μH，VDD=4.2V
2.6
W
THD+N=10%，f=1kHz，RL=4Ω+15μH，VDD=3.6V
2.35
W
THD+N=1%，f=1kHz，RL=4Ω+15μH，VDD=3.6V
1.92
W
One wire pulse control
TH
SHDN
high level duration time
VDD=3.0V to 5.0V
0.75
2
10
μs
TL
SHDN
low level duration time
VDD=3.0V to 5.0V
0.75
2
10
μs
TLATCH
SHDN
turn on delay time
VDD=3.0V to 5.0V
150
500
μs
TOFF
SHDN
turn off delay time
VDD=3.0V to 5.0V
150
500
μs
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
9
Parameter
Test conditions
Min
Typ
Max
Units
NCN（Note 4）
TAT
Attack time
-13.5dB gain attenuation completed
40
ms
TRL
Release time
13.5dB gain release completed
1.2
s
AMAX
Maximum attenuation
-13.5
dB
Dual Level Dual Rate AGC（Note 5）
TATF
Fast attack time
-13.5dB gain attenuation completed
1.5
ms
TATS
Slow attack time
-13.5dB gain attenuation completed
6
ms
TATT
Total attack time
-13.5dB gain attenuation completed
7.5
ms
TRL
Release time
13.5dB gain release completed
280
ms
AMAX
Maximum attenuation
-13.5
dB
Note 4, Note 5
：
Attack time points to 13.5dB gain attenuation time
；
Release time points to 13.5dB gain recovery time.
MEASUREMENT SETUP
AW8738 features switching digital output, as shown in Figure 6. Need to connect a low pass filter to
VOP/VON output respectively to filter out switch modulation frequency, then measure the differential
output of filter to obtain analog output signal.
VOP
VON
INP
INN
Rin
Cin
AW8738
Rin
Cin 30kHz
Low-Pass Fliter
500Ω
500Ω
10nF
10nF
Figure 6 AW8738 test setup
Low pass filter uses resistance and capacitor values listed in Table 1.
Rfilter
Cfilter
Low-pass cutoff frequency
500Ω
10nF
32kHz
1kΩ
4.7nF
34kHz
Table 1 AW8738 recommended values for low pass filter
Output Power Calculation
According to the above test methods, the differential analog output signal is obtained at the output of the
low pass filter. The valid values Vo_rms of the differential signal as shown below:
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
10
Vo_rms
The power calculation of Speaker is as follows：
）speaker the of impedance load：（
)_(
P
2
L
L
L
R
R
rmsVo
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
11
TYPICAL CHARACTERISTICS
0
10
20
30
40
50
60
70
80
90
100
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
PO ( W )
Efficiency( % )
Efficiency vs PO
RL=8Ω+33μH
VDD=4.2V
VDD=3.6V
0
10
20
30
40
50
60
70
80
90
100
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
Efficiency( % )
Efficiency vs PO
RL=6Ω+33μH
VDD=4.2V
VDD=3.6V
16
24
2
4
6
8
10
12
14
18
20
22
50 100 20K
1K 10K
GAIN vs FREQUENCY
Frequency ( Hz )
Gain( V/V )
Rine=3kΩ
Cin=1μF
RL=8Ω+33μH
0
0.2
0.4
0.6
0.8
1.0
1.2
3.3 3.5 3.9 4.3
VDD ( V )
NCN Output Power( W )
OUTPUT POWER vs VDD
3.7 4.1
1.4
RL=8Ω+33μH
MODE1
MODE2
MODE3，MODE5
AW8738 PO keep constant
MODE4，MODE6
0
0.2
0.4
0.6
0.8
1.0
1.2
3.3 3.5 3.9 4.3
VDD ( V )
OUTPUT POWER vs VDD
3.7 4.1
1.4
RL=6Ω+33μH
MODE3，MODE5
MODE4，MODE6
16
24
2
4
6
8
10
12
14
18
20
22
50 100 20K
1K 10K
GAIN vs FREQUENCY
Frequency ( Hz )
Gain( V/V )
Rine=3kΩ
Cin=1μF
RL=6Ω+33μH
PO ( W )
AW8738 PO keep constant
NCN Output Power( W )
AW8738 Data Sheet
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12
2
PO vs VIN
PO (W)
Vp
0.1 1
0.5
1
0.5
2
2PO vs VIN
PO (W)
Vp
0.1 1
0.5
1
0.5
2
Mode2
VDD=4.2V
f=1kHz
RL=8Ω+33μH
NCN
Mode1
VDD=4.2V
f=1kHz
RL=8Ω+33μH
0.28 1.30
NCN
0.25 1.20
0.1 0.1
PO( W )
0.1 1 2
0.5
0.1
10
0.01
THD+N (%)
1
THD+N vs PO
VDD=3.6V
VDD=4.2V
Mode7
f=1kHz
Cin=1μF
RL=6Ω+33μH
0.001 3
THD+N vs FREQUENCY
Frequency ( Hz )
50 100 20K1K 10K
MODE7 Po=0.8W
VDD=4.2V
Rine=3kΩ
Cin=1μF
RL=6Ω+33μH
0.1
0.01
0.001
THD+N (%)
10
1
THD+N vs FREQUENCY
Frequency ( Hz )
50 100 20K1K 10K
MODE7 Po=0.8W
VDD=4.2V
Rine=3kΩ
Cin=1μF
RL=8Ω+33μH
0.1
0.01
0.001
THD+N (%)
10
1
PO( W )
0.1 1 3
0.5
0.1
10
0.01
THD+N (%)
1
THD+N vs PO
VDD=3.6V
VDD=4.2V
Mode7
f=1kHz
Cin=1μF
RL=8Ω+33μH
0.001 2
AW8738 Data Sheet
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20 100 20K
1K 10K
-90
-80
-70
-60
-50
-40
-30
PSRR (dB)
PSRR vs FREQUENCY
Frequency ( Hz )
VDD=3.6V
VDD=4.2V
-20
-10
0
Mode1
Rine=3kΩ
Cin=1μF
RL=8Ω+33μH
20 100 20K
1K 10K
-90
-80
-70
-60
-50
-40
-30
PSRR (dB)
PSRR vs FREQUENCY
Frequency ( Hz )
VDD=3.6V
VDD=4.2V
-20
-10
0
Mode7
Rine=3kΩ
Cin=1μF
RL=8Ω+33μH
Vp
0.1
2PO vs VIN
PO (W)
Vp
0.1 1
0.5
1
0.5
2
NCN
Mode3,Mode5
VDD=4.2V
f=1kHz
RL=8Ω+33μH
0.23 1.07
PO vs VIN
0.1 1
0.5 2
0.1
0.5
2
1
Mode4,Mode6
VDD=4.2V
f=1kHz
RL=8Ω+33μH
NCN
0.20 0.93
PO (W)
Vp
0.1
2
PO (W)
Vp
0.1 1
0.5
1
0.5
2
NCN
Mode3,Mode5
VDD=4.2V
f=1kHz
RL=6Ω+33μH
0.23 1.07
0.1 1
0.5 2
0.1
0.5
2
1
Mode4,Mode6
VDD=4.2V
f=1kHz
RL=6Ω+33μH
NCN
0.20 0.93
PO (W)
PO vs VIN PO vs VIN
AW8738 Data Sheet
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14
SINGLE-LEVEL-AGC
10ms/div
Vin
VOP-VON
SINGLE-LEVEL-AGC
Vin
VOP-VON
200ms/div
MULTI-LEVEL-AGC
5ms/div
Vin
VOP-VON
MULTI-LEVEL-AGC
Vin
VOP-VON
100ms/div
START-UP SEQUENCE
SHDN
VOP&VON
10ms/div
SHUTDOWN SEQUENCE
SHDN
VOP&VON 100μs/div
AW8738 Data Sheet
June 2015 V1.1
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DETAILED FUNCTIONAL DESCRIPTION
AW8738 is specifically designed to eliminate smart mobile phone music noise, to enhance overall sound
quality, which is a new high efficiency, low noise, ultra-low distortion, constant large volume, eighth
generation class K audio amplifiers. AW8738 integrated Awinic proprietary multi-level AGC audio
algorithm, effectively eliminate music noise, improve sound quality and volume. Using a new generation
93% efficiency K-Chargepump, power amplifier‟s overall efficiency reaches 83%, greatly prolong the
mobile phone usage time. AW8738 noise floor is as low as to 40μV, with 99.6dB high
signal-to-noise-ratio(SNR). The ultra-low distortion 0.008% and unique multi-level AGC technology brings
high quality music enjoyment.
AW8738 has 0.6W, 0.8W, 1W and 1.2W four selectable speaker-guard output power levels, which is
suitable for different rated power speakers, greatly improve the volume, effectively protect speakers. With
multi-level AGC audio algorithms, the music is pure natural and melodious. AW8738 is compatible with
AW8736, AW8737, output power cannot drop along with lithium battery voltage lower down. Within
lithium battery voltage range(3.3V-4.35V), output power is constant.
The AW8738 built in excellent pop-click noise suppression circuit, effectively avoids pop-click noise
during shutdown, wakeup, and power-up/down operation of AW8738.
The AW8738 uses Awinic proprietary TDD-Noise suppression technology and EMI suppression
technology, effectively restrain TDD-Noise and EMI interference.
AW8738 built-in over current protection, over-temperature protection and short circuit protection function,
effectively protect the chip. The AW8736 uses small 2mmx2mm FC-16 package.
CONSTANT OUTPUT POWER
In the mobile phone audio applications, the NCN function to promote music volume and quality is very
attractive, but as the lithium battery voltage drops, general power amplifier output power will reduce
gradually, leads to smaller and smaller music volume. So, it is hard to provide high quality music within
the battery voltage range. The AW8738 uses unique second generation NCN technology, within lithium
battery voltage range(3.3V-4.35V), output power is constant, the output power cannot drop along with
lithium battery voltage lower down. Even if the battery voltage drops, AW8738 can still provide high
quality large volume music enjoyment. There are seven AW8738 operation modes, first four modes have
NCN function, the output power level is 1.2W,1W,0.8W, 0.6W,respectively. The five and six modes have
Multi-level AGC function, the output power level is 0.8W, 0.6W,respectively.
Second Generation NCN technology
In audio application, output signal will be undesirable distortion caused by too large input and power
supply voltage down with battery, and clipped output signal may cause permanent damage to the speaker.
The traditional NCN function adjusts system gain automatically to generate desired output by detecting
the “Crack” distortion of output signal, makes the output audio signal maintain smooth, not only can
effectively avoid overloading output power to the damage of speaker, at the same time bring the constant
shock of high quality music enjoyment. The traditional NCN function is shown below in figure 7.
AW8738 Data Sheet
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NCNOFF NCNON
Battery
Voltage
NCNOFF NCNON
Battery
Voltage
Crack Noise
Crack Noise
Figure 7 Traditional NCN Operation Principle
AW8738 adopts Awinic unique second generation NCN technology, the output signal is free from
limitation of power rail. When battery voltage drops, NCN output signal will not distort, output amplitude
remains unchanged, keeping constant output power, as shown in figure 8. Even if the battery voltage
drops, AW8738 can still provide high quality large volume music enjoyment.
Traditional NCN function
Supply
Rail Constant
output power
Second Generation NCN funciton
Battery
Voltage
Figure 8 Second generation NCN Operation Principle
Attack time
Attack time is the time it takes for the gain to be attenuated -13.5dB once the audio signal exceeds the
NCN threshold. Fast attack times allow the NCN to react quickly and prevent transients such as symbol
crashes from being distorted. However, fast attack times can lead to volume pumping, where the gain
reduction and release becomes noticeable, as the NCN cycles quickly. Slower attack times cause the
NCN to ignore the fast transients, and instead act upon longer, louder passages. Selecting an attack time
that is too slow can lead to increased distortion in the case of the No Clip function. According to mobile
phone and portable equipment audio features, attack time of AW8738 is set to be 40ms, effectively
keeping the music rhythm, and at the same time eliminating the crack distortion, protecting the speaker.
Release time
Release time is the time it takes for the gain to return to its normal level once the audio signal returns
below the NCN threshold. A fast release time allows the NCN to react quickly to transients, preserving the
original dynamics of the audio source. However, similar to a fast attack time, a fast release time
contributes to volume pumping. A slow release time makes the music smooth and soft, it is better to
suppress the crack distortion, but longer release time will make music sounds “boring” ,lack of impact.
According to mobile phone and portable equipment audio features, release time of AW8738 is set to be
1.2s.
AW8738 Data Sheet
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Multi-level AGC technology
In the actual audio application, system output power tends to be more than rated power of speaker, such
as in the 5V power supply, as for 8ohms speaker, the maximum undistorted power is about
1.56W, but many speakers‟ rated power is about 0.5W, if there is no output power control,
the overload signal can cause damage to the speaker. The audio power amplifier with NCN function (that
is single-level AGC) can protect the speaker effectively, with the increase of input signal, the output
power increases. When output power exceeds the setting threshold, the NCN function reduces the
internal gain of amplifier and restricts the output power under the set threshold.
But the NCN function has the attack time setting, which is the tradeoff between auditory
effect and crack distortion noise, if the attack time is longer, the audio volume will be
greater, but crack distortion will also increase; if the attack time is shorter, the crack distortion
will decrease, but the audio volume will be reduced. General music has large peak factor, which is in
the range of about 40~60dB, when playing music, the big peak signal output exceeds the
maximum output amplitude, there will be more crack distortion, and obvious noise will be heard in some
music, so it is need to use multi-level AGC technology to dynamically adjust the audio power amplifier,
to increase music volume, at the same time, eliminate the emergence of obvious noise in large volume
music and improve sound quality.
AW8738 integrated Awinic proprietary multi-Level AGC algorithm technology, effectively eliminating
the noise in the music, make sound pure natural, and greatly enhancing the sound volume. The
single-level AGC function and multi-level AGC function is shown in figure 9.
More Crack Distortion Few Of Crack Distortion
Crack distortion voltage
Constant output power
threshold voltage
Single-level AGC function: detect constant
output voltage，within attack time，output
has more crack distortion, and more noise
Multi-level AGC function: simultaneously detect crack distortion
voltage and constant output voltage, within attack time, output
has few of crack distortion, effectively eliminate noise
Constant output power
threshold voltage
Single-level AGC Multi-level AGC
Figure 9 Single-level AGC/Multi-level AGC Operation Principle
Attack time
Attack time is the time multi-level AGC takes for the gain to be attenuated -13.5dB once the audio signal
exceeds the constant output power threshold voltage. When the output signal crack noise occurred, the
Fast AGC of Multi-level AGC launched, attenuated the gain with 10dB within 1.5ms. When the crack
noise eliminated, the Slow AGC of Multi-level AGC launched, attenuated the gain slowly, with 3.5dB
within 6ms. According to smart mobile phone music noise features and demands for improve music
quality and volume, adoption of the Awinic proprietary technology „Multi-level AGC‟ inside AW8738, which
keeping the music rhythm effectively, and at the same time eliminating the crack distortion, protecting the
speaker.
Release time
Release time is the time multi-level AGC takes for the gain to return to its normal level once the audio
signal is smaller than crack distortion voltage or constant output power threshold voltage. According to
smart mobile phone music noise features and demands for improve music quality and volume, release
time of AW8738 is set to be 280ms, which can effectively eliminate the noise, make music sound pure
natural.
AW8738 Data Sheet
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K-Chargepump
AW8738 adopts a new generation of charge pump technology：K -Chargepump structure, it has high
efficiency and large driving ability, working frequency is 1.1MHz，built in soft start circuit, current limiting
control loop and over-voltage-protection(OVP) loop, guaranteeing system stable and reliable operation.
High Efficiency
AW8738 uses K-chargepump structure，booster output voltage PVDD is 1.5 times of supply voltage VDD,
the ideal efficiency can reach 100%. K-chargepump efficiency is the ratio of output power to input power,
that is
%100*
IN
OUT
P
P
For example, in an ideal M times charge pump, the input current IIN is M times of output current IOUT，the
efficiency formula can be written as：
%100*
*
%100*
** *
%100*
IN
OUT
OUTIN
OUTOUT
IN
OUT VM
V
IMV IV
P
P
M is charge pump work mode variable (1.5 times), VOUT is charge pump output voltage, VIN is power
supply voltage, IOUT is load current. For K-chargepump, the output voltage is 1.5 times of the input
voltage, due to the charge pump internal switch loss and IC static current loss, the actual efficiency will be
up to 93%. Therefore, K-chargepump booster technology can greatly improve the power efficiency.
Charge Pump Structure
Figure 10 is charge pump basic principle diagram, the charge pump used in AW8738 has seven switches,
the output voltage PVDD is 1.5 times as input voltage VDD through seven switches timing control.
+
+
CF1
2.2uF
CF2
2.2uF
VDD PVDD
C1P
C1N
C2P
C2N
S1
S2
S3
S4
S5
S6
S7
COUT
4.7uF
CIN
4.7uF
Figure 10 Charge Pump Principle Diagram
The operation of the charge pump has two phases. In Φ 1, as shown in figure 11, swtiches S1, S2 and S3
are closed, VDD charges to the flying capacitor CF1 CF2.
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+
+
CF1
2.2uF
CF2
2.2uF
VDD PVDD
C1P
C1N
C2P
C2N
S1
S2
S3
S4
S5
S6
S7
COUT
4.7uF
CIN
4.7uF
Charging Phase
Figure 11 Φ1: Flying Capacitor Charging
In Φ 2, as shown in figure 12: switches S1, S2 and S3 are disconnected, switches S4, S5, S6 and S7 are
closed. Because the voltage across the capacitor can't mutation, so the voltage on flying capacitor CF1
CF2, is added to the VDD, which make PVDD risen to a higher voltage.
+
+
CF1
2.2uF
CF2
2.2uF
VDD PVDD
C1P
C1N
C2P
C2N
S1
S2
S3
S4
S5
S6
S7
COUT
4.7uF
CIN
4.7uF
Discharging Phase
Figure 12 Φ2： Flying capacitor charge transfer to the output capacitance COUT
Soft start
K-chargepump has integrated soft start function in order to limit supply power inrush current during
start-up. The supply current is limited to be 350 mA, and the soft start time is 1.2 ms.
Current Limitation Control
K-chargepump has integrated the current limitation control loop. In normal operation, when the heavy
load or a situation that make charge pump flow through very large current, the current limitation control
loop will control charge pump maximum output current capacity, that is 2A.
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Over Voltage Protection(OVP)Control
K-chargepump‟s output voltage PVDD is a multiple of the input voltage VDD, which provide a high voltage
rail for internal power amplifier circuits, allowing the amplifiers provide greater output dynamic range in
the lithium battery voltage range, so as to realize the large volume, high quality class K audio enjoyment.
K-chargepump has integrated the over voltage protection control loop, when the input voltage VDD is
greater than 4V, the output voltage PVDD is no longer a multiple of VDD, but is controlled by over voltage
protection(OVP) loop and is stable in 6.05V, and the hysteresis voltage is about 50mV.
One-wire pulse control
One wire pulse control technology only needs a single GPIO port to operate the chip, complete a variety
of functions, it is very popular in the area of the GPIO port shortage and portable systems.
When the control signal line is longer, because of the signal integrity or radio frequency interference
problem, it will produce the narrow glitch signal. Awinic one wire pulse control technology integrated the
Deglitch circuit in internal control pin, which can effectively eliminate the influence of the glitch signal, as
shown in figure 13.
Deglitch
Glitch is eleminated
Control signal with glitch
SHDN
AW8738
Figure 13 Awinic Deglitch function diagram
The traditional one wire pulse control technology still receives pulse signal from control port when chip is
startup, so when the master control chip (such as mobile phone BB) sends wrong pulse during normal
operation, the system will enter into error states. AW8738 uses one wire pulse latch technology, after the
master control chip has sent pulses, the state will be latched, no longer receive the latter mis-sending
pulse signals, as shown in figure 14.
STATE 4
Traditional One Wire
Pulse Control
TLATCH
Shielding abnormal
pulse signal
STATE 3
STATE 4 STATE 3
Anti-interference One
Wire Pulse Control
Figure 14 Anti-interference One Wire Pulse Control Function Diagram
One Wire Pulse Control
AW8738 select each mode through the detection of number of the pulse signal rising edge of SHDN pin,
as shown in figure 15: When SHDN pin pull high from shutdown mode, there is only a rising edge,
AW8738 enter into mode 1,NCN output power is 1.2W; When high-low-high signal set to SHDN pin, there
AW8738 Data Sheet
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are two rising edges, AW8738 enter into mode 2, NCN output power is 1W; When there are three rising
edges, AW8738 enter into mode 3,NCN output power is 0.8W; When there are four rising edges,
AW8738 enter into mode 4, NCN output power is 0.6W„; AW8738 has seven operation modes, the
number of the rising edges does not allow more than seven.
THTL0.75μs<TL,TH<10μs
MODE1
MODE2
MODE3
MODE4
TOFF
Figure 15 One Wire Pulse Control
When AW8738 needs to work in different mode, PIN SHDN should be pull low longer than TOFF
first(recommended 1ms) which make the AW8738 shut down, Then send series pulse make the AW8738
enter into right mode, as shown in figure 16.
MODE2 MODE3
1ms
SHDN
Figure 16 One Wire Pulse Control Switching Sequence
RNS(RF TDD Noise Suppression)
GSM radios transmit using time-division multiple access with 217Hz intervals. The result is an RF signal
with strong amplitude modulation at 217Hz and its harmonics that is easily demodulated by audio
amplifiers.
In RF applications, improvements to both layout and component selection decrease the AW8738‟s
susceptibility to RF noise and prevent RF signals from being demodulated into audible noise. Minimizing
the trace lengths prevents them from functioning as antennas and coupling RF signals into the AW8738.
Additional RF immunity can also be obtained from relying on the self-resonant frequency of capacitors as
it exhibits the frequency response similar to a notch filter. Depending on the manufacturer, 10pF to 20pF
capacitors typically exhibit self resonance at RF frequencies. These capacitors, when placed at the input
pins, can effectively shunt the RF noise at the inputs of the AW8738. For these capacitors to be effective,
they must have a low-impedance, low-inductance path to the ground plane.
Some RF energy will couple onto audio traces regardless of the effort to prevent this phenomenon from
occurring, form audible TDD Noise。The AW8738 features a unique RNS technology, which effectively
reduces RF energy, attenuate the RF TDD-noise, an acceptable audible level to the customer.
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VDD
GND
VOP
VON
INP
INN
Rin
Cin
AW8738
Figure 17 RF Radiation coupling schematic diagram
Filter-Free Modulation Scheme
The AW8738 features a filter-free PWM architecture that reduces the LC filter of the traditional Class-D
amplifier, increasing efficiency, reducing board area consumption and system cost.
EEE
The AW8738 features a unique Enhanced Emission Elimination (EEE) technology, that controls fast
transition on the output, greatly reduces EMI over the full bandwidth.
Pop-Click Suppression
The AW8738 features unique timing control circuit, that comprehensively suppresses pop-click noise,
eliminates audible transients on shutdown, wakeup, and power-up/down.
Protection Function
When a short-circuit occurs between VOP/VON pin and VDD/GND or VOP and VON, the over-current
circuit shutdown the device, preventing the device from being damaged. When the condition is removed,
the AW8738 reactivate itself. When the junction temperature is high, the over-temperature circuit
shutdown the device. The circuit switches back to normal operation when the temperature decreases to
safe levels.
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APPLICATION INFORMATION
External Input Resistor-Rine（Gain setting）
The AW8738 is a differential audio amplifier. The IC integrates two internal input resistors, which is
Rini=6.6kΩ. Take external input resistor Rine=3kΩ for an example, gain setting as follows：
Vine ini
159.5kΩ159.5kΩ
A 16.6V/V
R R 3kΩ6.6kΩ
Input Capacitor-Cin（input high-pass cutoff frequency）
The input coupling capacitor blocks the DC voltage at the amplifier input terminal. The input capacitors
and input resistors form a high-pass filter with the corner frequency:
(Hz)
CRπ21
3dB)(f inintotal
H
Setting the high-pass filter point high can block the 217Hz GSM noise coupled to inputs. Better matching
of the input capacitors improves performance of the circuit and also helps to suppress pop-click noise.
Take typical application in Figure 1 as an example:
Hintotal in
11
f ( 3dB) (Hz) (Hz) 502Hz
2πR C 2 π9.6kΩ33nF
Differential input filter capacitor Cd (input low-pass cutoff frequency)
Input differential input filter capacitor and input resistor together to form a low-pass filter, could be used to
attenuate high frequency components of the input signal. When the musical sounds screechy, this
low-pass filter can be appropriately attenuate the high frequency part of the input signal, so that the music
signal sounds soft and comfortable. -3dB cutoff frequency of the low-pass filter is as follows:
(Hz)
C2)//R(Rπ21
3dB)(f
dineini
L
With input resistance Rine = 3kΩ, differential capacitance 220pF,for example, the low-pass cutoff
frequency is as follows:
Lini ine d
11
f ( 3dB) (Hz) (Hz) 175.7kHz
2π(R //R ) 2 C 2 π2.06kΩ2 220 F
p
Supply Decoupling Capacitor（CS）
The AW8738 is a high-performance audio amplifier that requires adequate power supply decoupling.
Place a low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1μF. This choice of
capacitor and placement helps with higher frequency transients, spikes, or digital hash on the line.
Additionally, placing this decoupling capacitor close to the AW8738 is important, as any parasitic
resistance or inductance between the device and the capacitor causes efficiency loss. In addition to the
0.1μF ceramic capacitor, place a 10μF capacitor on the VBAT supply trace. This larger capacitor acts as
AW8738 Data Sheet
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a charge reservoir, providing energy faster than the board supply, thus helping to prevent any droop in the
supply voltage.
Flying Capacitor（CF）
The value of the flying capacitor (CF) affects the load regulation and output resistance of the charge pump.
A CF value that is too small degrades the device‟s ability to provide sufficient current drive. Increasing the
value of CF improves load regulation and reduces the charge pump output resistance to an extent. A
2.2μF@10V capacitor is recommended.
Output Capacitor（COUT）
The output capacitor value and ESR directly affect the ripple at PVDD. Increasing COUT reduces output
ripple. Likewise, decreasing the ESR of COUT reduces both ripple and output resistance. A 4.7μF@10V
capacitor is recommended.
Optional Ferrite Bead Filter
The AW8738 passed FCC and CE radiated emissions with no ferrite chip beads and capacitors. Use
ferrite chip beads and capacitors if device near the EMI sensitive circuits and/or there are long leads from
amplifier to speaker, placed as close as possible to the output pin.
In the K class mode, the output is a square wave signal, which causing switch current at the output
capacitor, increasing static power consumption, and therefore output capacitor should not be too large,
1nF ceramic capacitors is recommended.
Bead
1nF
1nF
VOP
VON Bead
Figure 18 Ferrite Chip Bead and capacitor
DEMO PCB
Top Layer Bottom Layer
AW8738 Data Sheet
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DEMO PCB SCHEMATIC
PCB AND DEVICE LAYOUT CONSIDERATION
In order to obtain excellent performance of AW8738, PCB layout must be carefully considered. The
design consideration should follow the following principles:
1. Try to provide a separate short and thick power line to AW8738, the copper width is recommended to
be larger than 0.75mm. The decoupling capacitors should be placed as close as possible to power
supply pin.
2. The flying capacitors CF1，CF2 should be placed as close as possible to C1N, C1P and C2N, C2P,
so the same to the output capacitor COUT, it should be close to PVDD pin. The connection from
capacitor to PVDD pin should be short and thick.
3. The input capacitors and resistors should be close to AW8738 INN and INP input pin, the input line
should be parallel to suppress noise coupling.
4. The beads and capacitor should be placed near to AW8738 VON and VOP pin. The output line from
AW8738 to speaker should be as short and thick as possible. The width is recommended to be larger
than 0.5mm.
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
26
PACKAGE DESCRIPTION
SIDE VIEW
BOTTOM VIEWTOP VIEW
PIN 1# DOT
BY MARKING 2.000±0.050
2.000±0.050 FC-16
(2mmX2mm)
PIN 1#
IDENTIFICATION
0.400 Bsc
0.400 Bsc
Ø0.240±0.050
1.200
Ref.
0.203 Ref.
0.000-0.050
0.750±0.050
FC-16
Unit: mm
Ø0.23mm
0.4mm 0.4mm 0.4mm 0.4mm 0.4mm
0.4mm 0.4mm 0.4mm 0.4mm 0.4mm
LAND PATTERN
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
C3
C4
D1
D2
D3
D4
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
27
TAPE&REEL DESCRIPTION
Carrier Tape
Reel
AW8738 Data Sheet
June 2015 V1.1
www.awinic.com.cn COPYRIGHT ©2015 SHANGHAI AWINIC TECHNOLOGY CO., LTD.
28
VERSION INFORMATION
Version
Date
Description
V1.0
2014-05-03
AW8738FCR datasheet V1.0
V1.1
2015-06-16
Add tape & reel description; change C1 to Cd in application diagram;
AWINIC Technology cannot assume responsibility for use of any circuitry other than circuitry entirely
embodied in an AWINIC Technologies product. No intellectual property or circuit patent licenses are
implied. AWINIC Technology reserves the right to change the circuitry and specifications without notice at
any time.
