SI4311-B12 データシートの表示（PDF） - Silicon Laboratories

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SI4311-B12

315/433.92 MHZ FSK RECEIVER

Silicon Laboratories 

Si4311-B12/B21

3. Functional Description

3.1. Overview

Antenna

RX_IN

2.7 – 3.6 V VDD

GND

LNA

AGC

LDO

Si4311

ADC

DOUT

PGA

DSP

MCU

ADC

BASEBAND

AFC

315/434

PROCESSOR

DEV[1:0]

SQUELCH

BT[1:0]

AFC

XTAL

OSC

RST

16 MHz

Figure 3. Functional Block Diagram

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. The chip

operates at a carrier frequency of 315 or 433.92 MHz and supports FSK digital modulation with data rates of up to

10 kbps.

The device leverages Silicon Labs’ patented and proven digital low-IF architecture and offers superior sensitivity

and interference rejection. The Si4311 can achieve superior sensitivity in the presence of large interference due to

its high dynamic range ADCs and digital filters. The digital low-IF architecture also enables superior blocking ability

and low intermodulation distortion for robust reception in the presence of wide-band interference.

Digital integration reduces the number of required external components compared to traditional offerings, resulting

in a solution that only requires a 16 MHz crystal and passive components allowing a small and compact printed

circuit board (PCB) implementation area. The high integration of the Si4311 improves the system manufacturing

reliability, improves quality, eases design-in, and minimizes costs.

8

Rev. 1.0

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