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.

FEATUREs
■ Single chip receiver with only six external components
■ Selectable 315/433.92 MHz carrier frequency
■ Supports FSK modulation
■ High sensitivity (–104 dBm @ 5 kbps)
■ Excellent interference rejection
■ Selectable IF bandwidths
■ Automatic Frequency Centering (AFC)
■ Data rates up to 10 kbps
■ 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 °C temperature range

APPLICATIONs
■ 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