
Si4704/05-D50
2. Typical Application Schematic
Optional: Digital Audio Out
OPMODE: 0xB0, 0xB5
GPO1
C9
GPO2/INT
R 3
R 2
R 1
GPO3/DCLK
DFS
DOUT
1
NC
DOUT
15
FM Antenna
Embedded Antenna
C2
2
3
4
FMI
RFGND
Si4704/05
LPI
LOUT
ROUT
GND
14
13
12
LOUT
ROUT
5
RSTB
D50
VA
11
2.7 to 5.5 V
C1
VA
1.62 to 3.6 V
RSTB
GPO3
C5
X1
C6
RCLK
SDIO
SCLK
SENB
RCLK
C4
VD
Optional: For Crystal OSC
Notes:
1. Place C1 close to V A 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 “AN383: Si47xx Antenna, Schematic,
Layout, and Design Guidelines.” 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