LG GT350 - Page 45

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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
LG Electronics 42/115 LGE Property
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.
Figure 15 Audio amplifier
0
R303
0
R309
LM49151TLX
EUSY0390501
U303
4E
4D 3
D
4C
2
A
E2B3
B2
A1
C3
E3
C2
D2C1
A3D1
A4E1
4B
1B
DDV
D
DVS
L
INM+ LSOUT+
INM- LSOUT-
INL SET
INR
HPL
BYPASS
I2CVDD
SDA
SCL HPR
DNG
S
S
V
PC
N
1
C
P
1
C
DNGPC
220nC313
220nC314
220nC318
220nC319
220nC320
220nC321
2.2u
C322
0.1u
C323
0
R319
2.2u
C324 C325
2.2u
0.1uC326
100KR320
C328
0.1u
0.1u
C329
R324
0
VBAT
RCV_P
RCV_N
I2C2_SCL
I2C2_SDA
BB_SND_R
BB_SND_L
2V62_VIO
HSO_R
HSO_L
RCV_SPK_
N
FM_SND_L
FM_SND_R
RCV_SPK_P
EAR_GND
EAR_GND
AUDIO AMP SUB SYSTEM & SIGNAL DISTRIBUTOR