SI4707-B20 Datasheet, PDF(12/30 Page) Silicon Laboratories

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SI4707-B20 Datasheet, PDF (12/30 Pages) Silicon Laboratories – WEATHER BAND AND SAME DATA RECEIVER

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Si4707-B20

2. Typical Application Schematic

GPO1

GPO2

GPO3

FMI

1 NC

2 FMI

3 RFGND

4 NP1

5 RST

Si4707-GM

NP2 15

LOUT 14

ROUT 13

GND 12

VDD 11

LOUT

ROUT

VBATTERY

2.7 to 5.5 V

RST

SEN

SCLK

SDIO

RCLK

VIO

1.5 to 3.6 V

GPO3

RCLK

Optional: for crystal oscillator option

Notes:

1. Place C1 close to VDD pin.

2. All grounds connect directly to GND plane on PCB.

3. Pins 1 and 20 are no connects, leave floating.

4. Pins 4, 15, and 16 are unused; recommend connecting to ground.

5. To ensure proper operation and receiver performance, follow the guidelines in âAN383: Si47xx Antenna, Schematic,

Layout, and Design Guidelines.â Silicon Laboratories will evaluate schematics and layouts for qualified customers.

6. Pin 2 connects to the WB antenna interface.

7. Place Si4707 as close as possible to antenna jack and keep the FMI trace as short as possible.

Rev. 0.8

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