LG KE600 - Cell Phone Service Manual page 49

3. TECHNICAL BRIEF
3.13.1. Audio amplifier sub system IC with 3D effect
Audio amplifier sub system IC is an audio power amplifier capable of delivering 540mW of
continuous average power into a mono 8ߟ bridged-tied load(BTL) with 1% THD+N, 35mW per
channel of continuous average power into stereo 32ߟ single-ended (SE) loads with 1% THD+N
from a 3.3V Power supply. The LM4946 features a 32-step digital volume control and eight distinct
output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are
programmed through a two-wire I2C interface that allows flexibility in routing and mixing audio
channels.
TP304
SCL
TP303
SDA
VBAT
2V85_IO2
11
SCL
10
SDA
U301
13
ID_ENB
LM4946SQX
2
VOC
7
I2CSPI_VDD
14
I2CSPI_SEL
C369
0.1u
C320 C358
0.01u
2.2u
Figure 23 Audio amplifier Sub-system IC
U302
9
AMP_IN_L
8
FM_MAIN
7
6
AMP_IN_R
R331
100K
Figure 24 Audio signal distribute analog switch
FB309
FB310
C306 C357 4.7u
0.1u 1u C304
C310 C311
22p 22p
C361 220n
23
MONO_IN+ SNDOUT_L
C362 220n
22
MONO_IN- SNDOUT_R
15
C317 C316
MONO+
47p 47p
17
MONO-
0.068u
19
RHP3D1
C324
24
RHP3D2
8 C312 220n
RIN AMP_IN_R
5
ROUT
AMP_OUT_R
AMP_OUT_L
2V85_IO2
C329
0.01u
R327 0
1
1A 1B0
2
1S 1B1
R330 0
3
2S 2B0
4
2A 2B1
FSA2267L10X
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OUT301
OUT302
SNDOUT_L
FM_L
SNDOUT_R
FM_R