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MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
24
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MAX9778
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
IN1/2
MUTE
GAINA/B
HPS_EN
LOGIC
HPS
HPS
GAIN
SET
MUX
SHDN
1kΩ
10kΩ
15kΩ
15kΩ
TO
µCONTROLLER
GND
18
9, 13, 23, 27
PGND
Functional Diagrams (continued)