LG GT350 Service Manual page 45

3. TECHNICAL BRIEF
3.12.1 Audio amplifier
Audio amplifier sub system IC is an audio power amplifier capable of delivering 1.25W of continuous average
power into a mono 8Ω load, 42mW per channel of continuous average power into stereo 32Ω single-ended
(SE) loads. The LM49151 features 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.
RCV_P
RCV_N
FM_SND_L
BB_SND_L
BB_SND_R
FM_SND_R
I2C2_SDA
I2C2_SCL
LGE Internal Use Only
AUDIO AMP SUB SYSTEM & SIGNAL DISTRIBUTOR
VBAT
2V62_VIO
C329
0.1u
C313 220n
E1
INM+
C314 220n D1
INM-
C321 220n
C318 220n C1
INL
C319 220n C2
LM49151TLX
INR
C320 220n
C3
BYPASS
A1
I2CVDD
B2
SDA
B3
SCL
C322 C323
0.1u
2.2u
Figure 15 Audio amplifier
C328
0.1u
R324
EAR_GND
0
R309
A4
LSOUT+
A3 R303
LSOUT-
C326 0.1u
D2
SET
R320 100K
U303
E3
HPL
EUSY0390501
E2
HPR
C324 C325
2.2u
2.2u
R319
EAR_GND
0
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Copyright © 2010 LG Electronics. Inc. All right reserved.
0
RCV_SPK_P
0
RCV_SPK_N
HSO_L
HSO_R
Only for training and service purposes