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The TH72005 FSK/ASK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical (ISM) band. It can also be used for any other system with carrier frequencies ranging from 290 to 350 MHz.

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 290 to 350 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 290 to 350 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 -10 dBm to +11 dBm

  • Adjustable current consumption from 3.2 mA to 10.3 mA

  • Conforms to FCC part 15 and similar standards

  • 10-pin Quad Flat No-Lead 10L QFN 3x3 (Dual)
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FSK/ASK Transmitter - 315 MHz - TH72005

Features and benefits

  • Fully integrated PLL-stabilized VCO

  • Frequency range from 290 to 350 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 -10 dBm to +11 dBm

  • Adjustable current consumption from 3.2 mA to 10.3 mA

  • Conforms to FCC part 15 and similar standards

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

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