SI4822-A10 Datasheet, PDF (11/24 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

2. Typical Application Schematic
Si4822/26-A10
FMI
(Si4826 only)
C5
AMI
0.47u
ANT2
C5
AMI
0.47u
RFGND
T1
Optional: AM air loop antenna
C1
0.1u
RESET
To host MCU ^SDIO
SCLK
VR1
100k
TUNE1
BAND
S1
1
2 ^AM
3
IRQ To host MCU
FM
LNA_EN
R2
253k
R3
180k
R4
67k
Optional
C4
0.1u
Y1
32.768KHz
C3 C2
22p 22p
Optional
AOUT
VDD
2.0 TO 3.6V
VDD
2.0 TO 3.6V
Notes:
1. Place C4 close to VDD2 and DBYP pins.
2. All grounds connect directly to GND plane on PCB.
3. Pin 6, Pin 7, and Pin 23 leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in “AN602: Si4822/26/40/44 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 Si4822/26 as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.
7. Recommend keeping the AM ferrite loop antenna at least 5 cm away from the Si4822/26.
8. Keep the AM ferrite loop antenna at least 5 cm away from MCU, audio amplifier, and other circuits which have AM
interference.
9. Place the transformer T1 away from any sources of interference and even away from the I/O signals of the Si4822/26.
Rev.1.0
11