Instruction Manual

MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
______________________________________________________________________________________ 25
MAX9757 Block Diagram
HPV
DD
HPS
INR
BIAS
VOL
GAIN1
GAIN2
BEEP
3V TO 5.5V
CPV
DD
C1P
C1N
C1
1
μ
F
C
BIAS
1
μ
F
0V TO
HPV
DD
C
IN
1
μ
F
C
IN
1
μ
F
0.47
μ
F
1
μ
F
CPGND
INL
31
26
28
1
2
4
9
10
12
11
CPV
SS
13
V
SS
V
DD
14
28 5, 21
32
1
μ
F
3V TO 5.5V
6
29
7
20
19
17
22
15
16
HPL
HPR
MAX9757
0.1
μ
F 0.1
μ
F
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
3
25
8, 18
100
μ
F
4.5V TO 5.5V
PV
DD
R
B
47k
Ω
FIGURE SHOWN WITH AN ATTACK TIME = 495μs, RELEASE TIME = 990ms AND AN OUTPUT POWER LIMIT SET TO 1.2W, SPKR GAIN = 25.5dB, HP GAIN = 3dB.
100
μ
F
180k
Ω
C2
1
μ
F
GND PGND
DR
23
CT
30
PREF
27