Audio - LG KE800 Service Manual

3.6 Audio

KE800 Audio signal flow diagram as following diagram
3.6.1. 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 8Ω bridged-tied load(BTL) with 1% THD+N, 35mW per channel of continuous
average power into stereo 32Ω 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.
AMP_IN_R
FM_BBP_SEL
Figure 3-8 Audio signal flow diagram
VBAT
2V85_IO2
C233
0.1u
11
SCL SCL
10
SDA SDA
U209
13
ID_ENB
LM4946SQX
2
VOC
7
I2CSPI_VDD
14
I2CSPI_SEL
Figure 3-9 Audio amplifier Sub-system IC
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3. TECHNICAL BRIEF
C230
C231 C232
4.7u
0.1u 1u
C235 1u
23
MONO_IN+ BBP_SND_L
C236 1u
22
MONO_IN- BBP_SND_R
15
C237 C238
MONO+ SPK_P
47p 47p
17
MONO- SPK_N
C239 0.068u
19
RHP3D1
R220 4.7K
24
RHP3D2
8 C244 220n
RIN AMP_IN_R
5
ROUT
HS_OUT_R
HS_OUT_L