EVB7122

27 to 930MHz Transceiver

Evaluation Board Description

39012 07122 02

Page 1 of 24

EVB Description

Rev. 005

June/07

Features

!

Single chip solution with only a few external

components

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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

!

FSK for digital data or FM for analog signal

reception

!

FSK/ASK mode selection

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RSSI output for signal strength indication and

ASK reception

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ASK detection normal or with peak detector

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Switchable LNA gain for improved dynamic

range

!

Automatic PA turn-on after PLL lock

!

ASK modulation achieved by PA on/off keying

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3wire bus serial control interface

!

EVB comes with a cable to connect to a PC’s

LPT port

!

EVB programming software is available on

Melexis web site

Ordering Information

Part No. (see paragraph 6)

EVB7122-315-FSK-C

EVB7122-868-FSK-C

EVB7122-433-FSK-C

EVB7122-915-FSK-C

Note 1:

EVB default population is FSK, ASK modifications according to section 4.2 and 4.3.

Note 2:

EVB7122 is applicable for devices TH7122 and TH71221.

Application Examples

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General bi-directional half duplex digital data

RF signaling or analog signal communication

!

Tire Pressure Monitoring Systems (TPMS)

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Remote Keyless Entry (RKE)

!

Low-power telemetry systems

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Alarm and security systems

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Wireless access control

!

Garage door openers

!

Networking solutions

!

Active RFID tags

!

Remote controls

!

Home and building automation

Evaluation Board Example

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

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

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