LG GS290 Service Manual page 44

GS290 Operational Description
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.
EAR_P
EAR_N
FM_AUDIO_L
BB_SND_L
BB_SND_R
FM_AUDIO_R
Figure 15 Audio amplifier PMIC
3.12.2. Microphone circuit
Figure 16 Microphone circuit
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Only for training and service purposes
LG Electronics
C311 C320
VIO_2V62
0.1u 2.2u
C364 220n E1
INM+
C365 220n D1
INM-
C347
220n
C350 1u
C1
INL
C351 1u
C2
INR
C321
220n
C3
BYPASS
A1
I2CVDD
B2
I2C_SDA SDA
B3
I2C_SCL SCL
C361 C313
4.7u
0.1u
R348
0
EAR_GND
MIC
FB305
MAIN_MIC_P
BLM15AG121PN1
FB306
MAIN_MIC_N
BLM15AG121PN1
L303
VMIC_P
100n
C322 C318
C307
47p
27p
27p
VMIC_N
46/136
VBAT
A4
LSOUT+
A3
LSOUT-
D2
SET
U304
LM49151TLX
E3
HPL
E2
HPR
C363 R330
C362
C319
100K
0.1u
2.2u
2.2u
C373 22n
MIC300
1
OUT
C374 22n
2
G1
3
G2
4
G3
5
PWR
6
G4
SPM0410LR5H-QB
C314
VA300
VA302
1u
- 45 -
3. TECHNICAL BRIEF
Revision B
SPK_RCV_P
SPK_RCV_N
HSO_L
HSO_R
C343 C342
27p 27p
LGE Internal Use Only
LGE Property