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3. TECHNICAL BRIEF
3.15 FM Radio (Si4702, U202)
The Si4702 integrates the complete tuner function from antenna input to stereo audio output for FM
broadcast radio reception.
FM RADIO
C226
FM_ANT
nFM_RESET
R222
C231
100K
NA
2V8_RADIO
R226
4.7K
FM_SCLK
FM_SDATA
FM_32K
LGE Internal Use Only
2V8_VEXT
R213
2V8_RADIO
NA
TP200
TP201
C224
1u
1
15
NC1
GND3
100p
2
14
U202
FMIP
LOUT
3
13
RFGND
ROUT
SI4702-B16
4
12
GND1
GND2
5
11
_RST
VD
R225
10K
R227
4.7K
R228
47
FM_LDO_EN
Figure 3.15 FM Radio
2V8_RADIO
2V8_RADIO
C222
0.1uF
C227
0.1uF
R218
20K
R219
20K
C228
0.1uF
C232
RADIO_AMP_SHDN
22n
2V8_RADIO
R223
100K
C234
0.1uF
VBAT
2V8_RADIO
U204
1
5
STBY
NC
2
6
R229
GND
BGND
3
4
VIN
VOUT
R231
C236
0
BH28FB1WHFV
100K
NA
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 38 -
R216
39K
U203
7
8
VDD
VOUT1
RADIO_SPK_L
1
VIN1
6
VOUT2
RADIO_SPK_R
5
VIN2
2
3
BYPASS
GND
4
9
_SHDN
BGND
LM4809LD
C233
R224
0.1uF
39K
C237
1u
Only for training and service purposes
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