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MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
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23
MAX9777
2:1
INPUT
MUX
INL1
10k
Ω
0.1µF
1
µF
100
µF
0.68
µF 15kΩ
1kΩ
15kΩ
0.68
µF
0.68
µF
0.68
µF
4.5V TO 5.5V
PV
DD
V
DD
3, 4
8
7
10
12
15k
Ω
15kΩ
33.2kΩ
27.4kΩ
10kΩ
10kΩ
0.047µF
220µF
220µF
33.2k
Ω
27.4kΩ
0.047µF
22
21
24
26
16
11, 25
5
6
17
19
20
14
28
1
15
2
4.5V TO 5.5V
GAINLB
GAINLA
OUTL+
OUTL-
10k
Ω
10kΩ
10kΩ
AUDIO
INPUT
AUDIO
INPUT
INL2
BIAS
BIAS
GAIN
SET
MUX
2:1
INPUT
MUX
INR1
10k
Ω
GAINRB
GAINRA
OUTR+
OUTR-
10k
Ω
10kΩ
10kΩ
AUDIO
INPUT
AUDIO
INPUT
INR2
SCL
SDA
ADD
INT
LOGIC
HPS
HPS
GAIN
SET
MUX
SHDN
1kΩ
10kΩ
15kΩ
15kΩ
TO
µCONTROLLER
GND
18
9, 13, 23, 27
PGND
Functional Diagrams