原标题：Silabs Si4312 OOK CMOS RF接收器方案

　　Silabs 公司的Si4312 是全集成OOK CMOS RF接收器，工作在无许可证的315MHz-433.92MHz UHF频段。可选择的载波频率315/433.92 MHz，支持OOK调制，支持具16MHz晶振，有高的灵敏度–110 dBm @ 1.0 kbps，数据速率高达10 kbps NRZ，主要用在卫星STB接收器，遥控，IR替代，车库和门开启，无钥匙进入，无线POS和玩具等。本文介绍了Si4312主要特性，方框图，功能方框图，OOK 433.92 MHz应用电路图与材料清单(BOM)以及Si4312-DEMO板主要特性，电路图和Si4312-DEMO板材料清单。

　　The Si4312 is a fully-integrated OOK 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 Si4312 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.

　　Si4312主要特性:

　　Single chip receiver with only six external components

　　Selectable 315/433.92 MHz carrier frequency

　　Supports OOK modulation

　　High sensitivity (–110 dBm @ 1.0 kbps)

　　Frequency scanning

　　Excellent interference rejection

　　Data rates up to 10 kbps NRZ (5 kbps Manchester)

　　Direct battery operation with onchip low drop out (LDO) voltage regulator

　　16 MHz crystal oscillator support

　　3x3x0.85 mm 20L QFN package (RoHS compliant)

　　–40 to +85℃ temperature range

　　Si4312应用:

　　Satellite set-top box receivers

　　Remote controls, IR replacement/extension

　　Garage and gate door openers

　　Home automation and security

　　Remote keyless entry

　　After market alarms

　　Telemetry

　　Wireless point of sale

　　Toys

　　图1。Si4312功能方框图

　　图2。Si4312 OOK 433.92 MHz应用电路图

　　OOK 433.92 MHz应用电路材料清单(BOM)：

　　Si4312-DEMO板

　　The Silicon Laboratories Si4312-DEMO board provides a complete OOK radio design with numerous selectable features that demonstrate the capabilities of the Silicon Laboratories Si4312 OOK receiver. The Si4312-DEMO board can be configured to receive OOK data from an SMA connector or wirelessly with an on-board printed circuit board (PCB) antenna. The demodulated output data from the Si4312-DEMO board can be measured via an SMA connector and/or observed with an LED and/or heard with an audio buzzer. The system is powered by a 9 V battery or an external 3.3 V power supply.

　　Si4312-DEMO板主要特性：

　　Single chip OOK receiver

　　Selectable 315/433.92 MHz carrier frequency

　　Selectable data rate, threshold hold time

　　图3。Si4312-DEMO板外形图(顶层)

　　图4。Si4312-DEMO电路图

　　Si4312-DEMO板材料清单：