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SI4820-A10 Datasheet(PDF) 9 Page - Silicon Laboratories

No. de pieza SI4820-A10
Descripción Electrónicos  BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER
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Fabricante Electrónico  SILABS [Silicon Laboratories]
Página de inicio  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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Si4820/24-A10
Rev. 1.0
9
2. Typical Application Schematic
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 "AN555: Si483x-B/Si4820/24 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 Si4820/24 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 tuner chip.
8.
Keep the AM ferrite loop antenna at least 5 cm away from MCU, audio AMP, 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 Si4820/24.
5
RFGND
Optional: AM air loop antenna
2.0 TO 3.6V
2.0 TO 3.6V
Optional
FM
AM
BAND
SW
Y1
32.768KHz
C2
22p
C3
22p
U1
C5
0.47u
ANT2
T1
C
0.47u
C4
0.1u
C1
0.1u
R1
100k
VR1
100k
12
3
4
S2
R3
143k
R4
180k
R5
67k
R6
110k
FMI
AOUT
AMI
AMI
VDD
VDD
TUNE1


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