Max9756 block diagram – Rainbow Electronics MAX9758 User Manual
Page 24
MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
24
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MAX9756 Block Diagram
HPV
DD
HPS
INR
BIAS
VOL
GAIN1
GAIN2
BEEP
3V TO 5.5V
CPV
DD
C1P
C1N
C1
1
μF
C
BIAS
1
μF
0V TO
HPV
DD
C
IN
1
μF
C
IN
1
μF
0.47
μF
1
μF
CPGND
INL
36
26
28
2
3
5
10
11
13
12
CPV
SS
14
V
SS
V
DD
V
DD
15
REGEN 24
IN 33
31
6, 22
34 OUT
4.65V OUTPUT TO CODEC
30 SET
1
DR 25
CT 35
PREF 29
1
μF
3V TO 5.5V
7
32
8
21
20
18
23
17
16
HPL
HPR
MAX9756
0.1
μF
0.1
μF
GAIN/
VOLUME
CONTROL
BTL
AMPLIFIER
RIGHT-
CHANNEL
AUDIO INPUT
OUTR+
OUTR-
CHARGE
PUMP
VOLUME
AND GAIN
CONTROL
HEADPHONE
DETECTION
SHUTDOWN
CONTROL
BEEP
DETECTION
GAIN/
VOLUME
BTL
AMPLIFIER
LEFT-CHANNEL
AUDIO INPUT
OUTL+
4.5V TO 5.5V
V
DD
OUTL-
PEAK
DETECT
GAIN3
SHDN
4
27
9, 19
100
μF
4.5V TO 5.5V
PV
DD
R
B
47k
Ω
FIGURE SHOWN WITH AN ATTACK TIME = 495
μs, RELEASE TIME = 990ms AND AN OUTPUT POWER LIMIT SET TO 1.2W, SPKR GAIN = 25.5dB, LDO SHOWN IN FIXED OUTPUT MODE, HPGAIN = 3dB.
0.033
μF
C1
1
μF
GND
PGND
LDO
C3, C4
1
μF
1
μF
1
μF
180k
Ω