3. TECHNICAL BRIEF
- 54 -
3.16 FM radio with RDS function
The FM receiver uses a digital low-IF architecture which allows for the elimination of external
components and factory adjustments. The receive (RX) section integrates a low noise amplifier (LNA)
supporting the worldwide FM broadcast band (87.5 to 108 MHz). An automatic gain control (AGC)
circuit controls the gain of the LNA to optimize sensitivity and rejection of strong interferers.
10K
R150
0
R176
2V72_IO
47K
R182
2V72_IO
0.1u
C147
2V85_IO2
NC2
23
PGND
25
RCLK
11
RF_GND
3
ROUT
15
SCLK
9
10
SDIO
18
VA
VD
13
12
VIO
_RST
7
8
_SEN
4
FMIN
2
FMIP
GND1
1
GND2
5
6
GND3
14
GND4
GND5
17
24
GND6
GPIO1
21
20
GPIO2
GPIO3
19
16
LOUT
22
NC1
U105
SI4701
C154
0.1u
GND
2
1
4
VCC
5
TC7SH04FS
U107
C157
1u
C152
NA
27p
C155
C144
100p
0.1u
C153
C148
1u
CLK32K
FM_INT
FM_SND_L
SCL
SDA
_FM_RESET
FM_ANT
FM_SND_R
Figure 28 FM Radio circuit
Содержание KE820
Страница 1: ...Service Manual Model KE820 Service Manual KE820 Date August 2006 Issue 1 0 ...
Страница 3: ... 4 ...
Страница 5: ... 6 ...
Страница 46: ...3 TECHNICAL BRIEF 47 Figure 18 EN SET port control method ...
Страница 69: ...4 PCB layout 70 Figure 45 Main PCB bottom Figure 46 Main PCB bottom placement ...
Страница 70: ...4 PCB layout 71 Figure 47 Sub PCB top Figure 48 Sub PCB top placement ...
Страница 71: ...4 PCB layout 72 Figure 49 Sub PCB bottom Figure 50 Sub PCB bottom placement ...
Страница 114: ...6 Download S W upgrade 115 6 2 Download program user guide ...
Страница 115: ... 116 6 Download S W upgrade ...
Страница 116: ... 117 6 Download S W upgrade ...
Страница 117: ... 118 6 Download S W upgrade ...
Страница 124: ... 125 8 PCB LAYOUT ...
Страница 125: ... 126 8 PCB LAYOUT ...
Страница 126: ... 127 8 PCB LAYOUT ...
Страница 127: ... 128 8 PCB LAYOUT ...
Страница 129: ...9 RF Calibration 130 9 2 3 Click SETTING Menu 9 2 4 Setup Ezlooks menu such as the following figure ...
Страница 131: ...9 RF Calibration 132 9 2 7 Select MODEL 9 2 8 Click START for RF calibration 9 2 9 RF Calibration finishes ...
Страница 132: ...9 RF Calibration 133 9 2 10 Calibration data will be saved to the following folder Saving format year month day_PASS ...
Страница 136: ... 137 11 STANDALONE TEST 4 Click Update Info for communicating Phone and Test Program Connected ...
Страница 141: ... 142 ...
Страница 161: ...Note ...
Страница 162: ...Note ...