LG KP500 Service Manual page 48

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
B _ B N S
B _ B N S
F _ M N S
F _ M N S
2 I _ C
I C 2 S _
E R A
E R A
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2 C 0 0 2 C 1 0
. 2 u 2 u 1
2 C 3 0
A4
C1N
u 1
A5
C1P
2 C 6 0 u 1
D1
D R _ INA2
2 C 7 0 u 1
D2
D L _ INA1
2 C 8 0 u 1
C1
D R _ INB2
2 C 9 0 u 1
C2
D L _ INB1
B2
BIAS
B3
D S A SDA
C3
L C SCL
2 R 0 0 8 2 .
D4
P _ RXIN+
2 R 1 0 8 2 .
B4
N _ RXIN-
2 C 1 1
u 1
Figure 17 Audio amplifier PMIC
3. TECHNICAL BRIEF
VBAT VBAT
2 C 2 0
. 2 u 2
A1
HPR
A2
HPL
U200
MAX9877AEWP_TG45
EUSY0360201
D5
OUT+
B5
OUT-
2 C
2 p 7
- 49 -
H S O R _
H S O L _
S K P R _ V C P _
2 C 0 1
D I N
S K P R _ V C N _
2 1 2 C 3 1
2 p 7
LGE Internal Use Only