LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.5.9 FM Radio (U103 : SI4702-C19-GM)
The Si4702’s patented digital low-IF architecture reduces external components and eliminates the
need for factory adjustments. The receive (RX) section integrates a low noise amplifier (LNA)
supporting the worldwide FM broadcast band (76 to 108 MHz). An automatic gain control (AGC) circuit
controls the gain of the LNA to optimize sensitivity and rejection of strong interferers.
[Fig. 3.9] FM Radio system architecture in the KF700
VREG_MSMP_2.7V
VREG_MSMP_2.7V
TP101
TP100
SCLK
8
SDIO
VA
16
VD
11
10
VIO
_RST
5
_SEN
6
FMIP
2
GND1
4
1
2
GND2
15
GND3
19
GPIO1
GPIO2
18 17
GPIO3
LOUT
14
1
NC1
NC2
20
21
PGND
RCLK
9
RFGND
3
ROUT
13
7
SI4702-C19-GM
U103
1u
C156
TP102
C157
10n
0.1u
C169
100p
C158
FM_I2C_SCL
FM_I2C_SDA
FM_CONTROL
FM_BUSEN
SLEEP_CLK
FM_ANT
FM_AUDIO_R
FM_AUDIO_L
Содержание KF700
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