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The TH71221 is a single chip FSK/FM/ASK transceiver IC. It is designed to operate in low-power multi-channel programmable or single-channel stand-alone, half-duplex data transmission systems. It can be used for applications in automotive, industrial-scientific-medical (ISM), short-range devices (SRD) or similar applications operating in the frequency range of 300MHz to 930MHz. In programmable user mode, the transceiver can operate down to 27MHz by employing an external VCO varactor diode.

 

FEATURES Single chip solution with only a few external components Stand-alone fixed-frequency user mode Programmable multi-channel user mode Low current consumption in active mode and very low standby current PLL-stabilized RF VCO (LO) with internal varactor diode Lock detect output in programmable user mode On-chip AFC option for extended input frequency acceptance range 3-wire bus serial control interface FSK/ASK modulation selection FSK for digital data and FM for analog signal reception RSSI allows signal strength indication and ASK reception Peak detector for ASK detection Switchable LNA gain for improved dynamic range Automatic PA turn-on after PLL lock ASK modulation achieved by PA on/off keying 32-pin Quad Flat No-Lead (32L QFN 5 x 5 Quad)

APPLICATIONS Wireless access control Tire pressure monitoring systems (TPMS) Remote keyless entry (RKE) Remote controls Alarm and security systems Garage door openers Active RFID tags General bi-directional half duplex digital or analog signal communication Home and building automation Low power telemetry systems Networking solutions

 

 Application Notes

Name	Application Notes
Crystal Selection Guide
PA Output Matching
TH7122 and TH71221 Cookbook
TH7122 High Speed Data Communication
TH7122 Used In Narrow Band FSK Applications
TH7122 Using an External Microprocessor Reference Oscillator (RO)
TH7122 with External PA and LNA

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
TH71221ELQ		Transceiver - 27 to 930MHz FSK/FM/ASK, Multi-Channel (32L QFN 5 x 5 Quad)

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