TH7122 Datasheet, PDF(1/44 Page) Melexis Microelectronic Systems

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TH7122 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

TH7122

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 Low profile Quad Flat Package (LQFP)

Ordering Information

Part Number

Temperature Code

TH7122

E (-40 Â°C to 85 Â°C)

Package Code

NE (LQFP32)

Delivery Form

250 pc/tray

2000 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

OUT_PA

IN_LNA

VEE_LNA

OUT_LNA

GAIN_LNA

IN_MIX

VEE_IF

OUT_MIX

TH7122

RE/SCLK

VCC_DIG

ASK/FSK

IN_DTA

FSK_SW

VEE_RO

General Description

The TH7122 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 07122

Rev. 008

Page 1 of 44

Data Sheet

June/07

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