Si4720-A10-GM Silicon Laboratories Inc, Si4720-A10-GM Datasheet - Page 19

• Manufacturer Part Number: Si4720-A10-GM
• Description: RF Transceiver Broadcast FM Radio Transceiver
• Manufacturer: Silicon Laboratories Inc

Specifications of Si4720-A10-GM

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2. Test Circuit
2.1. Test Circuit Schematic
2.2. Test Circuit Bill of Materials
Component(s)
C2, C3
C5, C6
C1
C4
R1
U1
L1
X1
V
TXOUT
2 pF
Notes:
1. Si4720/21 is shown configured in I
2. GPO2/INT can be configured for interrupts with the powerup command.
3. To ensure proper operation and FM transmitter performance, follow the guidelines in
4. LIN, RIN line inputs must be ac-coupled.
50 Ω
“AN383: 3 mm x 3 mm QFN Universal Layout Guide.”
Silicon Laboratories will evaluate schematics and layouts for qualified customers.
TX Antenna
C4
R1
32.768 kHz crystal (Optional: for crystal oscillator option)
RCLK
SCLK
1.5 to 3.6 V
FMI
SDIO
SEN
RST
120 nH
V
Supply bypass capacitor, 22 nF, 20%, Z5U/X7R
IO
L1
Crystal load capacitors, 22 pF, ±5%, COG
Table 14. Si4720/21 Test Circuit Bill of Materials
(Optional: for crystal oscillator option)
Si4720/21 FM Radio Transceiver
AC Coupling Capacitor, 0.47 µF
2 pF, ±.05 pF, 06035JZR0AB
120 nH inductor, Qmin = 30
Figure 10. Test Circuit Schematic
1
2
3
4
5
Value/Description
NC
FMI
RFGND
TXO
RST
49.9 Ω, 5%
2
C compatible bus mode.
V
Rev. 1.0
Si4720/21
IO
U1
ROUT
LOUT
GND
RIN
V
0.47 µF
DD
C2
15
14
13
12
11
C3
0.47 µF
C5
C1
22 nF
Si4720/21-B20
X1
Silicon Laboratories
LOUT
ROUT
C6
Supplier(s)
LIN
RIN
RCLK
VBATTERY
2.7 to 5.5 V
Murata
Murata
Murata
Murata
Venkel
Epson
AVX
19