TH71221 Datasheet, PDF(1/44 Page) Melexis Microelectronic Systems

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TH71221 Datasheet, PDF (1/44 Pages) Melexis Microelectronic Systems – 27 to 930MHz FSK/FM/ASK Transceiver

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 for extended input frequency

acceptance range

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

! 3wire bus serial control interface

! FSK/ASK mode selection

! FSK for digital data or FM for analog signal

reception

! RSSI output for 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 Lead Package (QFN)

Ordering Information

Part Number

Temperature Code

TH71221

E (-40 Â°C to 85 Â°C)

Package Code

LQ (32 L QFN 5x5 Quad)

Delivery Form

73 pc/tube

5000 pc/T&R

Application Examples

! General bi-directional half duplex digital data

RF signaling or analog signal communication

! Tire Pressure Monitoring Systems (TPMS)

! Remote Keyless Entry (RKE)

! Low-power telemetry systems

! Alarm and security systems

! Wireless access control

! Garage door openers

! Networking solutions

! Active RFID tags

! Remote controls

! Home and building automation

Pin Description

top

bottom

IN_IFA

VCC_IF

IN_DEM

INT2/PDO

INT1

OUT_DEM

RSSI

OUT_DTA

TH71221

VEE_PLL

TNK_LO

VCC_PLL

FS1/LD

VEE_DIG

FS0/SDEN

General Description

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 appli-

cations operating in the frequency range of 300 MHz to 930 MHz. In programmable user mode, the trans-

ceiver can operate down to 27 MHz by employing an external VCO varactor diode.

39010 071221

Rev. 005

Page 1 of 44

Data Sheet

June/07

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