SI4720-B20-GMR Datasheet, PDF(21/48 Page) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

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SI4720-B20-GMR Datasheet, PDF (21/48 Pages) Silicon Laboratories – BROADCAST FM RADIO TRANSCEIVER FOR PORTABLE APPLICATIONS

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3.3. Digital Audio Inputs/Outputs

VIO

RX Antenna

TX/RX Antenna

120 nH

1 NC

2 FMI

3 RFGND

4 TXO

5 RST

Si4720/21

Si4720/21-B20

DOUT 15

DFS 14

DIN 13

GND 12

VDD 11

DCLK

DFS

DOUT

DFS

DIN

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 âAN383: Si47xx 3 mm x 3 mm QFN Universal Layout Guide.â

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)

C2, C3

R1, R2

Table 16. Si4720/21 Bill of Materials

Value/Description

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

AC Coupling Capacitor, 0.47 ÂµF

120 nH inductor, Qmin = 30

2 kï Resistor

600 ï Resistor

Si4720/21 FM Radio Transceiver

Supplier(s)

Murata

Any

Silicon Laboratories

Rev. 1.0

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