[Melexis]

Description

The TH7108 FSK/ASK/FM transmitter IC is designed for applications in the European 868MHz short range devices (SRD) band, according to the EN 300 220 telecommunications standard. It can also be used for any other system with carrier frequencies ranging from 700 to 1000 MHz (e.g. for applications in the US 915MHz ISM band).

Features

? fully integrated, PLL-stabilized VCO

? FSK through crystal pulling allows modulation from DC to 20 kbit/s

? high deviation possible for wideband data transmission

? ASK achieved by on/off keying of internal power amplifier

? FM possible with external varactor

? wide power supply range from 2.1 to 5.5 V

? flexible frequency range from 700 to 1000 MHz

? high over-all frequency accuracy

? adjustable output power range from -12 to +3 dBm

? adjustable current consumption from 6 to 12.5 mA

? deviation and center frequency independently adjustable

? very low standby current

? differential output well-suited for loop antenna

? external clock available for μC drive, down to 1.9 V supply

? ”clock only”mode

? conforms to EN 300 220 standard

Applications

? keyless car security and central locking

? low power telemetry

? alarm systems

? general digital data transmission

? general analog audio signal transmission