Only For Training And Service Purposes - LG GD310 Service Manual

3. Technical Brief
3.13.1. 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.
BB_SND_R
BB_SND_L
FM_SND_R
FM_SND_L
LGE Internal Use Only
C249
2.2U
C258
1U
C247 1U
C238 1U
C255 1U
C231 1U
C200 SDA
1U SCL
R211 2.2
EAR_P
R218 2.2
EAR_N
Figure 18. Audio amplifier PMIC
VBAT VBAT
R240 R241
0 0
C225 C230
1U 2.2U
A4
C1N
A5
C1P HPR
HPL
D1
INA2
D2
U200
INA1
MAX9877AEWP_TG45
C1
INB2
C2
INB1 OUT+
B2
BIAS OUT-
B3
SDA
C3
SCL
D4
RXIN+
B4
RXIN-
R235
0
- 46 - Copyright © 2009 LG Electronics. Inc. All right reserved.
A1
HSO_R
A2
HSO_L
D5
SPK_RCV_P
B5
SPK_RCV_N
C259 C211
27P 27P

Only for training and service purposes