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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.12.1 Audio amplifier
Audio amplifier sub system IC is an audio power amplifier capable of delivering 1.2 W of continuous
average power into a mono 8Ω load, 50mW per channel of continuous average power into stereo 32Ω
single-ended (SE) loads. The MAX9877 features a 32-step digital volume control and ten distinct
output modes. The digital volume control, output modes (mono/SE/OCL) are programmed through a
two-wire I2C interface that allows flexibility in routing and mixing audio channels.
AUDIO AMP SUB SYSTEM & SIGNAL DISTRIBUTOR
D2
INA1
D1
INA2
INB1
C2
INB2
C1
D5
OUT+
OUT-
B5
P
G
N
D
C
4
P
V
D
D
C
5
D4
RXIN+
RXIN-
B4
C3
SCL
B3
SDA
V
D
D
B
1
V
S
S
A
3
U200
MAX9877AEWP_TG45
EUSY0360201
BIAS
B2
A4
C1N
A5
C1P
G
N
D
D
3
A2
HPL
A1
HPR
I
N
D
0
1
2
C
u
1
1
0
2
C
u
1
8
0
2
C
u
1
7
0
2
C
2
.
8
0
0
2
R
u
1
3
0
2
C
2
1
2
C
p
7
2
u
1
6
0
2
C
u
1
9
0
2
C
VBAT
u
1
1
1
2
C
u
2
.
2
0
0
2
C
2
0
2
C
u
2
.
2
VBAT
2
.
8
1
0
2
R
p
7
2
3
1
2
C
R
_
D
N
S
_
B
B
P
_
V
C
R
_
K
P
S
N
_
V
C
R
_
K
P
S
L
_
D
N
S
_
M
F
P
_
R
A
E
N
_
R
A
E
L
_
O
S
H
R
_
O
S
H
L
_
D
N
S
_
B
B
R
_
D
N
S
_
M
F
L
C
S
_
C
2
I
A
D
S
_
C
2
I
Figure 17 Audio amplifier PMIC
