SI4730-C40-GM Datasheet, PDF (18/42 Pages) Silicon Laboratories – BROADCAST AM/FM RADIO RECEIVER

Si4730/31-C40
3. Typical Application Schematic (SSOP)
Optional: Digital Audio Output
DOUT
DFS ^C4
R3
R2
1
2
GPO3/DCLK
R1 ₃
GPO2/INT
4
GPO1
5
NC 6
NC ₇
FMI
8
RFGND ₉
L1
AM antenna
NC 10
NC 11
AMI ₁₂
C5
24
LOUT
23
22 ^DBYP
21 ^VDD
20 ^VIO
ROUT
C1 _{2.0 to 5.5 V}
1.85 to 3.6 V
19
RCLK
18
SDIO
17
SCLK
16
SEN
15
RST
14
13
GND
GPIO3
X1
RCLK
F2
RFGND
C2
C3
Optional: for crystal oscillator option
AMI
T1
C5
Optional: AM air loop antenna
Notes:
1. Place C1 close to V_DD and DBYP pins.
2. All grounds connect directly to GND plane on PCB.
3. Pins 6 and 7 are no connects, leave floating.
4. Pins 10 and 11 are unused. Tie these pins to GND.
5. 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.
6. Pin 8 connects to the FM antenna interface, and pin 12 connects to the AM antenna interface.
7. Place Si4730/31 as close as possible to antenna and keep the FMI and AMI traces as short as possible.
18
Rev. 1.0