AN383 Datasheet, PDF (48/69 Pages) Silicon Laboratories – Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES

AN383
10.3. SW Whip Antenna Bill of Materials
Designator
WIP_ANTENNA
L1
SW1
C3
C8
FERRITE_ANTENNA
U2, U3
C1
L2
Description
Notes
Whip Antenna
Low Pass Filter Inductor, 1008, Q of 20 or greater at 25 MHz and minimal DC
SM, 4.7 µH, COILCRAFT, resistance.
1008CS-472GLB
SPDT Switch
Optional, only needed if the design requires
switching between AM and SW.
Not required for SW only applications.
Capacitor, 33 pF, 5%, COG
AC coupling capacitor, 0.47 µF,
10%, Z5U/X7R
AM Antenna
Optional, can be replaced with a 220 µH shunt
inductor for SW only applications
IC, SM, ESD DIODE, SOT23-3,
California Micro Devices,
CM1213-01ST
Capacitor, 18 pF, 5%, COG Optional, only for FM
Ind, 0603, SM, 180 nH,
Optional, only for FM
MURATA, LQW18ANR18J00D
48
Rev. 0.8