SI4831-B30 Datasheet, PDF (8/20 Pages) Silicon Laboratories – BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER

Si4831/35-B30
2. Typical Application Schematic
FMI
(Si4835 only)
C5
AMI
0.47u
ANT2
C5
AMI
0.47u
RFGND
T1
Optional: AM air loop antenna
R1
100k
C1
0.1u
VR1
100k
R2
10k
TUNE1
S2
BAND 1
2 ^AM
3
STATION_LED
FM
STEREO_LED
R3
253k
R4
180k
R5
67k
U1
C4
0.1u
Y1
32.768KHz
C3
C2
22p
22p
LOUT
ROUT
VDD
2.0 TO 3.6V
VDD
2.0 TO 3.6V
Optional
Notes:
1. Place C₄ close to V_DD2 and DBYP pins.
2. All grounds connect directly to GND plane on PCB.
3. Pin 6 and 7 leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in "AN555: Si483x-B Antenna, Schematic,
Layout, and Design Guidelines." Silicon Labs will evaluate the schematics and layouts for qualified customers.
5. Pin 8 connects to the FM antenna interface and pin 12 connects to the AM antenna interface.
6. Place Si483x as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.
8
Rev. 1.0