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| SI4704-D50 Datasheet, PDF (15/34 Pages) Silicon Laboratories – BROADCAST FM RADIO RECEIVER FOR CONSUMER | |||
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2. Typical Application Schematic
Si4704/05-D50
FM Antenna
C2
Embedded Antenna
RSTB
Optional: Digital Audio Out
OPMODE: 0xB0, 0xB5
GPO1
GPO2/INT
1 NC
DOUT 15
2 FMI
LOUT 14
3 RFGND
ROUT 13
4 LPI Si4704/05 GND 12
5 RSTB
D50
VA 11
C9
R3
R2
R1
GPO3/DCLK
DFS
DOUT
LOUT
ROUT
2.7 to 5.5 V
VA
C1
1.62 to 3.6 V
VD
C4
RCLK
SDIO
SCLK
SENB
GPO3
X1
C5
RCLK
C6
Optional: For Crystal OSC
Notes:
1. Place C1 close to VA pin.
2. Pins 1 and 20 are no connects, leave floating.
3. Place C4 close to DFS pin.
4. To ensure proper operation and receiver performance, follow the guidelines in âAN383: Si47xx Antenna, Schematic,
Layout, and Design Guidelines.â Silicon Laboratories will evaluate schematics and layouts for qualified customers.
5. Pin 2 or Pin 4 connects to the FM antenna interface. Pin 2 is for a half-wave antenna. Pin 4 is for an embedded antenna.
6. Place Si4704/05 as close as possible to antenna jack and keep the FMI and LPI traces as short as possible.
Rev. 1.0
15
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