SI4712-B30 Datasheet, PDF (15/42 Pages) Silicon Laboratories – FM RADIO TRANSMITTER WITH RECEIVE POWER SCAN

Si4712/13-B30
2. Test Circuit
2.1. Test Circuit Schematic
2 pF
V_TXOUT
50 
C4
L1
120 nH
R1
V_IO
1 _NC
2 _NC
3 _RFGND
4 _TXO
5 _RST
U1
Si4712/13
C2
0.47 µF
C3
RIN ^{15 0.47 µF}
DFS ¹⁴
DIN ¹³
GND ¹²
VDD ¹¹
C1
22 nF
LIN
RIN
VBATTERY
2.7 to 5.5 V
RST
SEN
SCLK
SDIO
RCLK
VIO
1.5 to 3.6 V
Notes:
1. Si4712/13 is shown configured in I²C compatible bus mode.
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 “AN383: 3 mm x 3 mm QFN Universal Layout Guide.”
Silicon Laboratories will evaluate schematics and layouts for qualified customers.
4. LIN, RIN line inputs must be ac-coupled.
Figure 9. Test Circuit Schematic
2.2. Test Circuit Bill of Materials
Component(s)
C1
C2, C3
C4
L1
R1
U1
Table 12. Si4712/13 Test Circuit Bill of Materials
Value/Description
Supply bypass capacitor, 22 nF, 20%, Z5U/X7R
AC Coupling Capacitor, 0.47 µF
2 pF, ±.05 pF, 06035JZR0AB
120 nH inductor, Qmin = 30
49.9 , 5%
Si4712/13 FM Radio Transmitter
Supplier(s)
Murata
Murata
AVX
Murata
Murata
Silicon Laboratories
Rev. 1.1
15