SI4827-A10 Datasheet, PDF (11/25 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

2. Typical Application Schematic
Si4827-A10
FMI
C5
0.47u
C5
ANT2
AMI
0.47u
RFGND
T1
C1
0.1u
Optional: AM air loop antenna
RESET
To host MCU ^SDIO
SCLK
VR1
100k
BAND
IRQ To host MCU
TUNE1
R1
203k 1%
SW
S1
1
2
3
4
R2
50k 1%
AM
R3
180k 1%
FM
R4
67k 1%
C4
0.1u
Y1
32.768KHz
C3 C2
22p 22p
Optional
Optional
AOUT
VDD
2.0 TO 3.6V
Notes:
1. Place C4 close to VDD and GND pins.
2. All grounds connect directly to GND plane on PCB.
3. Pin 5 leave floating.
4. To ensure proper operation and receiver performance, follow the guidelines in “AN602: Si4822/26/27/40/44 Antenna,
Schematic, Layout, and Design Guidelines.” Silicon Labs will evaluate the schematics and layouts for qualified
customers.
5. Pin 6 connects to the FM antenna interface and pin 8 connects to the AM antenna interface.
6. Place Si4827 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 Si4827.
8. Keep the AM ferrite loop antenna 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 Si4827.
Rev. 1.0
11