LG GX500 - The Web; Accessing the Web

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Only for training and service purposes
3. TECHNICAL BRIEF
GX500 Operational Description Revision A
LG Electronics 58/143 LGE Property
3.11.1 Audio amplifier
The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as
cellular phones.
The LM49151 combines a 1.25W mono E2S class D amplifier, 125mW Class AB earpiece driver, 42mW/channel
stereo ground referenced headphone drivers, volume control, input mixer/multiplexer, and speaker
protection into a single device..
Figure 3-21 Audio amplifier
3.11.2. Microphone circuit
Figure 3-22 Microphone circuit
C712
0.1u
VBAT
C702
0.1uF
10u
C701
C704
2.2uF
1uC705
1uC706
1
07L
Hu1.0
207L
H
u
1.0
C708
0.1uF
C709
2.2uF
U701
LM49151TL
4E
4D 3D
4C 2A
E2B3
B2
A1
C3
E3
C2
D2C1
A3D1
A4E1
4B
1B
DDV D
D
V
S
L
INM+ LSOUT+
INM- LSOUT-
INL SET
INR
HPL
BYPASS
I2CVDD
SDA
SCL HPR
DNG
SSVPC
N
1
C
P1C
DN
GP
C
27pF
C710C711
27pF
FB701
2V62_VIO
2.2u
C713
smh
oK0
0
1
20
7
R
220nC703
220nC707
SPK_N
SPK_P
RCV_N
RCV_P
HSO_L
HSO_RI2C1_SCL
I2C1_SDA
AMP_IN_L
A
MP_IN_R
AUDIO AMP SUB SYSTEM
VA301
VA302
MIC301
SPU0410HR5H-PB
4
3
2
1
P
G1
G2
O
0
623R
47p
C307
47P
C311
1V8_MIC_BIAS
100NH
L303
403L
HN001
2.2u
C318
47p
C316
MAIN_MIC_P
MAIN_MIC_N
MAIN MIC