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SI4743 Folha de dados(PDF) 11 Page - Silicon Laboratories

Nome de Peças SI4743
Descrição Electrónicos  Si474X ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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Fabricante Electrônico  SILABS [Silicon Laboratories]
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AN400
Rev. 0.5
11
C2 (18 pF) is the ac coupling capacitor going to the FMI pin.
L2 (100 nH), L1 (120 nH), and L5 (150 nH) are the tuning inductors that provide dual peaking for FM and Weather
band. These inductors, together with the whip antenna capacitance (~22 pF at the center of FM band), 18 pF ac
coupling cap (C2), and 5 pF typical FMI pin input capacitance (C_FMI), resonate in the FM band as well as
Weather band. If either of the capacitance values changes, the inductor values have to be adjusted to achieve
peaking in both bands (desired peaking at 100 MHz and 162 MHz). The equivalent schematic model is shown
below. Si4740/41/44/45 do not support weather band. L5 can be replaced by a 0
 resistor, and the value of L2 can
be changed to 33 nH to support FM band only for Si4740/41/44/45.
U1 is a required ESD diode since the antenna is exposed. The diode should be chosen with no more than 1 pF
parasitic capacitance, such as the California Micro Device CM1213.
Figure 7. FM/WB Whip Antenna Schematic Model
3.3. FM/WB Whip Antenna Bill of Materials
Table 5. FM/WB Whip Antenna Bill of Materials
Designator
Description
WIP_ANTENNA Whip antenna
C2
Capacitor, 18 pF, 5%, COG
L1
Inductor, 0603, SM, 120 nH,
MURATA, LQW18ANR12J00D
L2
Inductor, 0603, SM, 100 nH,
MURATA, LQW18ANR10J00D
L5
Inductor, 0603, SM, 150 nH,
MURATA, LQW18ANR15J00D
U2
IC, SM, ESD DIODE, SOT23-3, California
Micro Devices, CM1213-01ST


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