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ASK Transmitter - 868/915 MHz


The Melexis TH72032 ASK transmitter IC is designed for applications in the European 868 MHz industrial-scientific-medical (ISM) band, according to the EN 300 220 telecommunications standard.


It can also be used for any other system with carrier frequencies ranging from 850 to 930 MHz (for example for applications in the US 902 to 928 MHz ISM band).

The transmitter's carrier frequency is determined by the frequency of the reference crystal fref. The integrated phase-locked loop (PLL) synthesizer ensures that carrier frequencies, ranging from 850 to 930 MHz, can be achieved. This is done by using a crystal with a reference frequency according to fref = fc/N, where N = 32 is the PLL feedback divider ratio.
ASK Transmitter - 868/915 MHz - TH72032

Features and benefits

  • Fully integrated PLL-stabilized VCO

  • Frequency range from 850 to 930 MHz

  • Single-ended RF output

  • ASK achieved by on/off keying of internal power amplifier up to 40 kbit/s

  • Wide power supply range from 1.95 to 5.5 V

  • Operating temperature range -40 °C to +125 °C

  • Very low standby current

  • On-chip low voltage detector

  • High over-all frequency accuracy

  • Adjustable output power range from -11 dBm to +9 dBm

  • Adjustable current consumption from 5.1 mA to 13.4 mA

  • Conforms to EN 300 220 and similar standards

  • 8-pin Small Outline Integrated Circuit (SOIC)
Used in these


  • Building, Security, Home & Office Automation
  • Consumer Solutions

Inspired Engineering

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