Specifications
Si4730/31/34/35-D60
20 Rev. 1.1
2. Typical Application Schematic
2.1. QFN Typical Application Schematic
Notes:
1. Place C1 close to VA pin and C4 close to VD 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 Si473x-D60 as close as possible to antenna and keep the FMI and AMI traces as short as possible.
C2
L2
C1
C5
X1
2
1
L1
C3T1
3
1
C9
C6
R3
R1
R2
C3
R3
C8
C7
R1
C9
R2
C4
16
17
18
19
20
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
NC
FMI
RFGND
AMI
RSTB
SENB
SCLK
SDIO
RCLK
VD
VA
GND
ROUT
LOUT
DOUT
NC
GPO1
GPO2/INT
GPO3/DCLK
DFS
Si473x
RFGND
AMI
GPO3 RCLK
RIN
DOUT
DOUT
DCLK
DFS
DFS
GP03/DCLK
LOUT
ROUT
LIN
Optional: For Crystal OSC
1.62 to 3.6 V
FM Antenna
Optional: Digital Audio Out
OPMODE: 0x5B, 0x0B
Optional: AM Air Loop Antenna
2.7 to 5.5 V
Optional: AUXIN/Digital Audio Out
D60
13
Si473x
14
17
15
16
OPMODE: 0xB0, 0xB5
SENB
SCLK
SDIO
RCLK
VD
VA
ROUT
LOUT
DOUT
DFS
GPO3/DCLK
GPO1
GPO2/INT
RSTB