TDC-GP22 Ultrasonic Flow Converter

TDC-GP22 Ultrasonic Flow Converter

Next generation time-to-digital ultrasonic flow converter with integrated analog front-end.

TDC-GP22 is a 2-channel TDC with additional analog elements like extended fire-pulse generator, zero-cross detection and analog switches for simplifying the use in ultrasonic flow meter applications. 

The additional first-hit detection makes TDC-GP22 suitable for high dynamic applications as ultrasonic water meters. An optimized power management of the various units brings down the operating current to a few µA at 2Hz measuring rate.

TDC-GP2x Ultrasonic Flow Converter

TDC-GP22 features and benefits


  • 2-channel TDC with 22ps resolution
  • Analog frontend for ultrasonic flow meters
  • Chopper-stabilized low-offset comparator for zero crossing detection
  • Precise windowing for hit selection
  • Temperature measuring unit for PT1000 sensors
  • QFN32 package


  • High precision
  • Low power
  • Few additional external components needed

Product properties


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Evaluation kit

The GP21 evaluation kit is designed as a platform for a quick and easy start-up and evaluation of the TDC-GP21 Time-to-Digital Converter. The evaluation kit offers user-friendly configuration and extensive testing of the TDC-GP21.