Only For Training And Service Purposes - LG KF510C Service Manual

3. TECHNICAL BRIEF
3.14.1 Audio amplifier
Audio amplifier sub system IC is an audio power amplifier capable of delivering 1.2 W of continuous
average power into a mono 8Ω load, 50mW per channel of continuous average power into stereo 32Ω
single-ended (SE) loads. The LM49100 features a 32-step 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.
AUDIO AMP
BB_SND_R
BB_SND_L
FM_SND_R
FM_SND_L
SDA
SCL
3.14.2 Microphone circuit
LGE Internal Use Only
A3
MINP
B3
MINN
A5
RIN
220n C213
B4
LIN
220n C214
LM49100GR
A4
BYPASS
D3
VDDI2C
D4
SDA
E5
SCL
2V62_VIO
R214 100K
C220
C223
C224
2.2u
4.7u
0.1u
Figure 21 Audio amplifier Sub-system IC
VMIC_P
MAIN_MIC_N
MAIN_MIC_P
Figure 22 Microphone circuit
VBAT
C202
C203
2.2u
0.1u
D5
LS+
B5
LS-
D1
HPL
U200
E1
HPR
C217
E3
GNDS 47p
D2
VDDHP
A1
VDDCP
C221 C222
4.7u 0.1u
MIC700 SPU0409HE5H-PB
1
P
2
G1
3
G2
4
O
Copyright © 2008 LG Electronics. Inc. All right reserved.
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SPK_OUTP
SPK_OUTN
L216 100nH
HSO_L
L210 100nH
HSO_R
C218
47p
2V85_VFM
L215
100nH

Only for training and service purposes