MAX9758 Maxim Integrated Products, MAX9758 Datasheet - Page 25

• Manufacturer Part Number: MAX9758
• Description: 2.3W Stereo Speaker Amplifiers and DirectDrive Headphone Amplifiers
• Manufacturer: Maxim Integrated Products

Headphone Amplifiers with Automatic Level Control
2.3W Stereo Speaker Amplifiers and DirectDrive
100μF
3V TO 5.5V
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.
______________________________________________________________________________________
C
LEFT-CHANNEL
BIAS
1μF
1μF
AUDIO INPUT
0.47μF
AUDIO INPUT
V
DD
CHANNEL
180kΩ
RIGHT-
1μF
1μF
C1
47kΩ
C2
HPV
R
0V TO
B
DD
1μF
C
1μF
C
IN
CPGND
CPV
CPV
IN
GAIN1
GAIN2
GAIN3
SHDN
BEEP
PREF 27
BIAS
C1N
VOL
C1P
V
INR
INL
DR 23
CT 30
DD
SS
SS
26
4
12
11
13
14
32
31
28
1
2
3
25
9
10
MAX9757
HEADPHONE
SHUTDOWN
DETECTION
DETECTION
AND GAIN
CONTROL
CONTROL
VOLUME
0.1μF
CONTROL
VOLUME
VOLUME
BEEP
CHARGE
DETECT
GAIN/
GAIN/
PUMP
PEAK
4.5V TO 5.5V
29
V
28
DD
GND
100μF
5, 21
PGND
4.5V TO 5.5V
8, 18
AMPLIFIER
AMPLIFIER
PV
BTL
BTL
DD
0.1μF
MAX9757 Block Diagram
22
20
19
17
15
16
6
7
OUTL+
OUTL-
OUTR+
OUTR-
HPV
HPS
HPL
HPR
DD
1μF
3V TO 5.5V
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