Si4311-B12/B21 315/433.92 MHZ FSK RECEIVER Features Single chip receiver with only six Data rates up to 10 kbps external components Direct battery operation with on- Selectable 315/433.92 MHz carrier chip low drop out (LDO) voltage frequency regulator Supports FSK modulation 16 MHz crystal oscillator support High sensitivity (104 dBm 5 kbps) 3x3x0.85 mm 20L QFN package (RoHS compliant) Excellent interference rejection 40 to +85 C temperature range Selectable IF bandwidths Ordering Information: Automatic Frequency Centering (AFC) See page 14. Applications Satellite set-top box receivers Remote keyless entry Pin Assignments Remote controls, IR After market alarms replacement/extension Telemetry Si4311 Garage and gate door openers Wireless point of sale (Top View) Home automation and security Toys Description 20 19 18 17 VDD 1 16 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 RFGND 2 15 BT0 for high-volume, cost-sensitive RF receiver applications, such as set-top box RF RX IN 3 14 BT1 receivers, remote controls, garage door openers, home automation, security, GND remote keyless entry systems, wireless POS, and telemetry. The Si4311 offers PAD RST 4 13 DOUT industry-leading RF performance, high integration, flexibility, low BOM, small AFC 5 12 GND board area, and ease of design. No production alignment is necessary as all RF functions are integrated into the device. 6 11 VDD 7 8 9 10 Functional Block Diagram Si4311 Antenna Patents pending. DOUT ADC RX IN PGA DSP LNA AFC MCU ADC BASEBAND 315/434 AGC PROCESSOR DEV 1:0 SQUELCH BT 1:0 VDD 2.7 3.6 V XTAL LDO AFC GND RST OSC 16 MHz Rev. 1.0 5/12 Copyright 2012 by Silicon Laboratories Si4311-B12/B21 Not Recommended for New Designs 315/434 NC GND VDD NC XTL1 NC DEV0 XTL2 DEV1Si4311-B12/B21 2 Rev. 1.0 Not Recommended for New Designs