Rev. 0.5 3/10

Copyright © 2010 by Silicon Laboratories

Si4311

This information applies to a product under development. Its characteristics and specifications are subject to change without notice.

Si4311

Features

Applications

Description

The Si4311 is a fully-integrated FSK CMOS RF receiver that operates in the

unlicensed 315 and 433.92 MHz ultra high frequency (UHF) bands. It is designed

for high-volume, cost-sensitive RF receiver applications, such as set-top box RF

receivers, remote controls, garage door openers, home automation, security,

remote keyless entry systems, wireless POS, and telemetry. The Si4311 offers

industry-leading RF performance, high integration, flexibility, low BOM, small

board area, and ease of design. No production alignment is necessary as all RF

functions are integrated into the device.

Functional Block Diagram

external components

frequency

chip low drop out (LDO) voltage

regulator

(RoHS compliant)

replacement/extension

Si4311

RX_IN

AGC

Antenna

LDO

VDD

GND

2.7 – 3.6 V

LNA

XTAL

OSC

RST

AFC

ADC

ADC

PGA

DSP

MCU

BASEBAND

PROCESSOR

SQUELCH

16 MHz

AFC

315/434

DEV[1:0]

DOUT

BT[1:0]

Patents pending

Ordering Information:

See page 14.

Pin Assignments

GND

PAD

1

2

3

17

18

19

20

11

12

13

14

6

7

8

9

4

5

16

10

15 BT0

BT1

DOUT

GND

AFC

VDD

RST

VDD

RFGND

RX_IN

Si4311

(Top View)