SI4721-B20-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI4721-B20-GMR

BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

Silicon Laboratories 

3.3. Digital Audio Inputs/Outputs

VIO

RX Antenna

TX/RX Antenna

L1

120 nH

1 NC

2 FMI

3 RFGND

4 TXO

5 RST

U1

Si4720/21

Si4720/21-B20

DOUT 15

DFS 14

DIN 13

GND 12

VDD 11

R1

R2

DCLK

DFS

DOUT

DFS

DIN

R3

C1

22 nF

VBATTERY

2.7 to 5.5 V

RST

SEN

SCLK

SDIO

RCLK

VIO

1.5 to 3.6 V

Notes:

1. Si4720/21 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: Si47xx 3 mm x 3 mm QFN Universal Layout Guide.”

Silicon Laboratories will evaluate schematics and layouts for qualified customers.

4. Dedicated RX antenna at FMI input optional.

Figure 12. Digital Audio Inputs (DIN, DFS, DCLK)

3.4. Typical Application Schematic Bill of Materials

Component(s)

C1

C2, C3

L1

R1, R2

R3

U1

Table 16. Si4720/21 Bill of Materials

Value/Description

Supply bypass capacitor, 22 nF, 20%, Z5U/X7R

AC Coupling Capacitor, 0.47 µF

120 nH inductor, Qmin = 30

2 k Resistor

600  Resistor

Si4720/21 FM Radio Transceiver

Supplier(s)

Murata

Murata

Murata

Any

Any

Silicon Laboratories

Rev. 1.0

21

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