Maxim Integrated MAX9778 - Manual (Page 24)

MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
24 _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _
MAX9778
2:1
INPUT
MUX
INL1
10k Ω
0.1 µ F
1 µ F
100 µ F
0.68 µ F 15k Ω
1k Ω
15k Ω 0.68 µ F
0.68 µ F
0.68 µ F
4.5V TO 5.5V
PV DD V DD
3, 4
8
7
10
12
15k Ω
15k Ω
33.2k Ω
27.4k Ω
10k Ω
10k Ω
0.047 µF
220 µF
220 µF
33.2k Ω
27.4k Ω
0.047 µF
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
10k Ω
10k Ω
AUDIO
INPUT
AUDIO
INPUT
INL2
BIAS
BIAS
GAIN
SET
MUX
2:1
INPUT
MUX
INR1
10k Ω
GAINRB
GAINRA
OUTR+
OUTR-
10k Ω
10k Ω
10k Ω
AUDIO
INPUT
AUDIO
INPUT
INR2
IN1/2
MUTE
GAINA/B
HPS_EN LOGIC
HPS
HPS
GAIN
SET
MUX
SHDN
1k Ω 10k Ω
15k Ω
15k Ω
TO
µCONTROLLER
GND
18 9, 13, 23, 27
PGND
Functional Diagrams (continued)