TH71082

 Fully integrated, PLL-stabilized VCO
 Flexible frequency range from 800 MHz to 930 MHz
 ASK achieved by on/off keying of internal power amplifier
 FM possible with external varactor
Wide power supply range from 2.2 V to 5.5 V
 High over-all frequency accuracy
 Very low standby current
Adjustable output power range from
   -18 dBm to -2 dBm
 Adjustable current consumption from 6.2 mA to 12.5 mA
 Single-ended RF output
 Clock output for C drive
 Conforms to EN 300 220 and similar standard

 Keyless car and central locking
 Low-power telemetry
 Alarm and security systems
 General digital data transmission
 General analog audio signal transmission
 Local oscillator signal generation

The TH71082 ASK transmitter IC is designed for applications in the European 868MHz industrialscientific- medical (ISM) band, according to the EN300 220 telecommunications standard. TH71082 can also be used for any other system with carrier frequencies ranging from 800 MHz to 930 MHz (e.g. for applications in the US 915MHz ISM band).

The transmitter TH71082's carrier frequency f_c is determined by the frequency of the reference crystal f_ref that is used. The integrated PLL synthesizer ensures that
each RF value, ranging from 800 MHz to 930 MHz, can be achieved by using a crystal with reference frequency according to: f_ref = f_c/N, where N = 32 is the PLL feedback divider ratio.