Rainbow Electronics MAX9758 - Manual (Page 25)

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 μF
C
BIAS
1 μF 0V TO
HPV DD
C
IN
1 μF
C IN
1 μF
0.47 μF
1 μF
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 μF
3V TO 5.5V
6
29
7
20
19
17
22
15
16
HPL
HPR
MAX9757
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
3
25
8, 18
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, HP GAIN = 3dB.
100 μF 180k Ω
C2
1 μF
GND PGND
DR 23
CT 30
PREF 27