Maxim MAX9777 Manual page 24

Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
µ
0.68 F
AUDIO
INPUT
AUDIO
INPUT
µ
0.68 F
0.68 µ F
AUDIO
INPUT
AUDIO
INPUT
µ
0.68 F
4.5V TO 5.5V
1kΩ 1kΩ
10kΩ
TO
µCONTROLLER
24 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
4.5V TO 5.5V
µ
100 F
11, 25 3, 4
PV V
DD
15kΩ
5 INL1
2:1
INPUT
6
INL2
MUX
15kΩ
17 BIAS
BIAS
µ
1 F
15kΩ
19 INR1
2:1
INPUT
20 INR2
MUX
15kΩ
14
SHDN
28
IN1/2
1
MUTE
LOGIC
15
GAINA/B
2 HPS_EN
MAX9778
GND
18
Functional Diagrams (continued)
µ
0.1 F
DD
GAINLB
GAIN
Ω
10k
SET
GAINLA
MUX
Ω
10k
OUTL+
10k Ω
Ω
10k
OUTL-
GAINRB
GAIN
Ω
10k
SET
GAINRA
MUX
Ω
10k
OUTR+
10k Ω
Ω
10k
OUTR-
HPS
HPS
PGND
9, 13, 23, 27
8
0.047µF
7
Ω
33.2k
Ω
27.4k
15k Ω
10
220µF
12
22
0.047µF
21
Ω
33.2k
Ω
27.4k
Ω
15k
24
220µF
26
16
Ω
10k
Ω
10k