SI4721-B20-GMR View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
SI4721-B20-GMR Datasheet PDF : 48 Pages
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Si4720/21-B20
4. Universal AM/FM RX/FM TX Application Schematic
Figure 13 shows an application schematic that supports the Si47xx family of 3 mm x 3 mm QFN products,
including the Si4702/3/4/5 FM receivers, Si471x FM transmitters, Si472x FM transceivers, and Si473x AM/FM
receivers.
R2
T5
S1
J1 HP Jack
LHEADPHONE
270 nH
System Component
D3
D4
System Component
System Component
D5
Right
Audio
Left
Audio
FB1
2.5 k @ 100 MHz
FB2
2.5 k @ 100 MHz
R16
2 k
GPIO3
C4
1 nF
GPIO2
GPIO1
FM Embedded RX/TX Antenna
R14
L1
0 10 nH
LSHORT
120 nH
C17/R21
3.3pF/0
AM Ferrite Antenna
LFERRITE
180–
600 uH
C16
470 nF
U2
Headphone Amplifier
System Component
1 NC
2 FMI
3 RFGND
4 TXO/AMI
5 RST
GND/RIN/DOUT 15
U1
Si47xx
LOUT/DFS 14
ROUT/DIN 13
GND 12
VDD 11
Si4702/03: Populate R12, R13, R21, C14, and C15
Si4704/05/1x/2x/3x Analog: Populate C7, C8, C14
and C15 as shown
Si4704/05/1x/2x/3x Digital: Populate R16, R17,
R18, R19, and R20 as shown
VBATTERY
2.7 to 5.5 V
R13
C7/R17
0
0.39 uF/ 2 k
LIN
RIN
R12
0
C8/R18
0.39 uF/ 600
C14/R19
0.39 uF/ 0
VBATTERY
C1 2.7 to 5.5 V
22 nF
C15/R20
0.39 uF/ 0
System Components
RST
SEN
SCLK
SDIO
RCLK
VIO
Figure 13. Universal AM/FM RX/FM TX Application Schematic
Following the schematic and layout recommendations detailed in “AN383: Universal Antenna Selection and Layout
Guidelines” will result in optimal performance with the minimal application schematic shown in Figure 13. “Universal
AM/FM RX/FM TX Application Schematic”. System components are those that are likely to be present for any tuner
or transmitter design.
22
Rev. 1.0
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