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The Melexis TH72035 FSK/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.
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Top Features

  • Fully integrated PLL-stabilized VCO

  • Frequency range from 850 to 930 MHz

  • Single-ended RF output

  • FSK through crystal pulling allows modulation from DC to 40 kbit/s

  • High FSK deviation possible for wideband data transmission

  • 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

  • FSK deviation and center frequency independently adjustable

  • 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

  • 10-pin Quad Flat No-Lead 10L QFN 3x3 (Dual)
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FSK/ASK Transmitter - 868/915 MHz - TH72035

Features and benefits

  • Fully integrated PLL-stabilized VCO

  • Frequency range from 850 to 930 MHz

  • Single-ended RF output

  • FSK through crystal pulling allows modulation from DC to 40 kbit/s

  • High FSK deviation possible for wideband data transmission

  • 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

  • FSK deviation and center frequency independently adjustable

  • 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

  • 10-pin Quad Flat No-Lead 10L QFN 3x3 (Dual)
Used in these

Industries

  • Automotive - Body, HVAC, Comfort & Lighting
  • Building, Security, Home & Office Automation

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