Si4827-A10

Rev. 1.0

11

2. Typical Application Schematic

Notes:

1.

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.

5

RFGND

Optional: AM air loop antenna

2.0 TO 3.6V

Optional

FM

AM

BAND

Optional

To host MCU

To host MCU

SW

Y1

32.768KHz

C2

22p

C3

22p

C5

0.47u

ANT2

T1

C

0.47u

C4

0.1u

C1

0.1u

VR1

100k

12

3

4

S1

R2

50k 1%

R3

180k 1%

R4

67k 1%

R1

203k 1%

IRQ

FMI

AOUT

AMI

VDD

TUNE1

SCLK

SDIO

RESET