Si4736/37/38/39-C40
2. Typical Application Schematic (QFN)
GPO1
GPO2/INT
R1
R2
GPO3/DCLK
DFS
DOUT
15
R3
DOUT
1
5
C1
FMIP
L1
AM antenna
Si4736/37 only C5
NC
2 FMI
3 RFGND
4 AMI
RST
LOUT/DFS
U1
Si4736/37/38/39-GM ROUT/DOUT
GND
VDD
14
13
12
11
Optional: Digital Audio Output
LOUT
ROUT
VBATTERY
2.7 to 5.5 V
RST
SEN
SCLK
SDIO
GPO3
C2
X1
C3
RCLK
RCLK
VIO
Optional: for crystal oscillator option
1.85 to 3.6 V
L2
RFGND
AMI
T1
C5
Optional: AM air loop antenna
Notes:
1. Place C1 close to V DD pin.
2. All grounds connect directly to GND plane on PCB.
3. Pins 1 and 20 are no connects, leave floating.
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 connects to the FM antenna interface, and pin 4 connects to the AM antenna interface.
6. Place Si4736/37/38/39 as close as possible to antenna and keep the FMI and AMI traces as short as possible.
Rev. 1.0
17
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