SI4706-C31 Datasheet, PDF (15/36 Pages) Silicon Laboratories – HIGH-PERFORMANCE FM RDS/RBDS RECEIVER

2. Typical Application Schematic
1 _NC
FMI
2 _FMI
3 _RFGND
U1
Si4706
LPI
4 _LPI
5 _RST
Si4706-C31
GPO1
GPO2/INT
R1
GPO3/DCLK
R2
DFS
DOUT ^{15 R3}
DOUT
Optional: Digital Audio Output
LOUT ¹⁴
ROUT ¹³
GND ¹²
VDD ¹¹
LOUT
ROUT
C1
VBATTERY
2.7 to 5.5 V
RST
SEN
SCLK
SDIO
RCLK
VIO
1.62 to 3.6 V
GPO3
X1
RCLK
C2
C3
Optional: for crystal oscillator option
Notes:
1. Place C1 close to V_DD pin.
2. Pins 1 and 20 are no connects, leave floating.
3. 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.
4. 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.
5. Place Si4706 as close as possible to antenna jack and keep the FMI and LPI traces as short as possible.
Rev. 1.0
15