SI4735-B20GM Silicon Laboratories Inc, SI4735-B20GM Datasheet - Page 15

• Manufacturer Part Number: SI4735-B20GM
• Description: RECEIVER, RADIO, MULTIBAND, 20QFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4735-B20GM

• Frequency Range: 520kHz To 21.85MHz
• Rf Ic Case Style: QFN
• No. Of Pins: 20
• Supply Voltage Range: 2.7V To 5.5V
• Applications: Audio Video Receivers, CD/DVD Players, Cellular Handsets, Emergency Radios
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Typical AM/FM Application Schematic
Notes:
1. Place C1 close to V
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,
5. Pin 2 connects to the FM antenna interface and pin 4 connects to the AM antenna interface.
6. RFGND should be locally isolated from GND.
7. Place Si473x as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.
AM antenna
Layout and Design Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
RCLK
SCLK
1.5 to 3.6 V
SDIO
RST
SEN
FMIP
VIO
L1
C5
DD
pin.
1
2
3
4
5
FMI
RFGND
AMI
RST
NC
Si473x-GM
U1
Rev. 0.5
ROUT/DOUT
LOUT/DFS
DOUT
GND
VDD
GPO3
15
14
13
12
11
Optional: for crystal oscillator option
R1
R2
Optional: Digital Audio Output
R3
L2
Optional: AM air loop antenna
C1
LOUT
ROUT
C2
T1
Si473x-B20
C5
GPO1
GPO2/INT
GPO3/DCLK
DFS
X1
DOUT
VBATTERY
2.7 to 5.5 V
C3
RFGND
RCLK
AMI
15