SI4712-B30 Datasheet, PDF (19/42 Pages) Silicon Laboratories – FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN

Si4712/13-B30
4.1. Universal AM/FM RX/FM TX Bill of Materials
The bill of materials for the expanded application schematic shown in Figure 12 is provided in Table 14. Refer to
the individual device layout guides and antenna interface guides for a discussion of the purpose of each
component.
Table 14. Universal AM/FM RX/FM TX Bill of Materials
Designator
Description
Note
C1
Supply bypass capacitor, 22 nF, 10%, Z5U/X7R, 0402
U1
Silicon Laboratories Si47xx, 3 mm x 3 mm, 20 pin, QFN
R12, R13, R19, 0  jumper, 0402
R20, R21
R12, R13, and R21 for
Si4702/03 Only
C16
AM antenna ac coupling capacitor, 470 nF, 20%, Z5U/X7R
AM Ferrite Antenna
LFERRITE AM Ferrite loop stick, 180–600 µH
AM Ferrite Antenna
FB1,FB2 Ferrite bead, 2.5 k @ 100 MHZ, 0603, Murata BLM18BD252SN1D Headphone Antenna
LHEADPHONE Headphone antenna matching inductor, 270 nH, 0603, Q>15, Murata
LQW18ANR27J00D
LSHORT Embedded antenna matching inductor, 120 nH, 0603, Q>30, Murata
LQW18ANR12J00D
R14
Embedded antenna jumper, 2.2 , 0402
Headphone Antenna
Embedded Antenna
Optional
C2
Supply bypass capacitor, 22 nF, 10%, Z5U/X7R, 0402
Optional
C3
Supply bypass capacitor, 100 nF, 10%, Z5U/X7R, 0402
Optional
C5, C6 Headphone amp output shunt capacitor, 100 pF, 10%, Z5U/X7R, 0402 Optional
R7-R11 Current limiting resistor, 20 –2 k, 0402
Optional
C12, C13 Crystal load capacitor, 22 pF, 5%, COG
Optional
X1
Crystal, Epson FC-135
Optional
C7, C8 Si47xx input ac coupling capacitor, 0.39 µF, X7R/X5R, 0402
System Component
D1-D5 ESD Diode, SOT23-3, California Micro Devices CM1214-01ST
System Component
C11
Supply bypass capacitor, 100 nF, 10%, Z5U/X7R, 0402
Headphone Amplifier
C4
Headphone antenna ac coupling capacitor, 1 nF, 10%, Z5U/X7R, 0402 Headphone Antenna
C9, C10 Headphone amp output ac coupling capacitor, 125 uF, X7R, 0805
Headphone Amplifier
C14, C15 Headphone amp input ac coupling capacitor, 0.39 µF, X7R/X5R, 0402 Headphone Amplifier
R1,R2,R3,R4 Headphone amp feedback/gain resistor, 20 k, 0402
Headphone Amplifier
R5, R6 Headphone amp bleed resistor, 100 k, 0402
Headphone Amplifier
U2
Headphone amplifier, National Semiconductor, LM4910MA
Headphone Amplifier
R16, R17 Current limiting resistor, 2 k0402
System Component
R18
Current limiting resistor, 600 , 0402
System Component
L1
VCO filter inductor, 10 nH, 0603, Q30, Murata, LQW18ANR01J00D Optional
C17
VCO filter capacitor, 3.3 pF, 0402, COG, Venkel,
C0402COG2503R3JN
Optional
Rev. 1.1
19