Rainbow Electronics MAX9770 - Manual (Page 19)

MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
______________________________________________________________________________________ 19
Block Diagram
HPS
IN1_L
GAIN2 HPS
V DD
V
DD
GND
GND
V DD
GAIN1
SELM
SEL1
V DD
CPV
DD
C1P
C1N
CPV
SS
SV
SS
GND
OSC/2 C1
1 µF
C
IN
0.47 µF
C2
1
µF
1 µF
CPGND
SYNC
25
(28)
21
(24)
22
(25)
14
(17)
12
(15)
13
(16)
10
(13)
7
(10)
9
(12)
11
(14)
8
(11)
5
(8)
26
(1)
16
(19)
20
(23)
18
(21)
2
(5)
19
(22)
6
(9)
4
(7)
3
(6)
HPOUTL
HPOUTR
1 µF
0.1 µF
2.5V TO 5.5V
MIXER/
MUX/GAIN
CONTROL
LEFT-CHANNEL
AUDIO INPUT 1
IN1_R
C IN
0.47 µF
28
(3)
RIGHT-CHANNEL
AUDIO INPUT 1
MONO
C IN
0.47 µF
23
(26)
MONO
AUDIO INPUT
IN2_L
C
IN
0.47 µF
24
(27)
LEFT-CHANNEL
AUDIO INPUT 2
IN2_R
C IN
0.47 µF
27
(2)
RIGHT-CHANNEL
AUDIO INPUT 2
CHARGE
PUMP
MUX AND
GAIN CONTROL
HEADPHONE
DETECTION
SHUTDOWN
CONTROL
OSCILLATOR
H-BRIDGE
V DD
OUT+
PV DD
2.5V TO 5.5V
V DD
OUT-
17
(20) PGND
V DD
SEL2
15
(18)
SHDN
( ) TSSOP PIN.
C
BIAS
0.047 µF
CLASS D
MODULATOR
MAX9770
1
(4) BIAS