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TDC-GP22 Ultrasonic Flow Converter

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


  • 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 component needed

Product parameters

Analog Frontend Yes
First Wave Detection Yes
Amplitude Measurement
Number of Hits 3
Resolution [ps] 22
Operating Supply Range 2.5 to 3.6
Interface SPI
Ambient Temperature Range [°C] -40 to +125
Package QFN32

General Description

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

This product suits for the following applications:

  • Ultrasonic water meters
  • Ultrasonic heat meters
  • Ultrasonic gas meters
  • Ultrasonic flow indicators
  • Laser rangefinders
  • Magnetostrictive sensors

Technical Documents

Name Type Description Version Language
TDC-GP22_GP30_AN000283_1-00.pdf Application Note Water / heat metering 1-00 English
TDC-GP22_AN000249_1-00.pdf Application Note Laser range finder 1-00 English
TDC-GP22_BD000330_1-00.png Block Diagram TDC-GP22 Block Diagram 1-00 English
TDC-GP22_DS000323_1-00.pdf Datasheet Document version 0.9 1-00 English
PCAPx_TDC-GPx_PS09_PD000176_1-00.pdf Other Product Document Change Notification_MOQ Amendment_PCAPx_TDC-GPx_PS09FN (issued 2017-Mar) 1-00 English
TDC-GP22_RC000127_1-00.pdf RoHS Certificate RoHS Certificate TDC-GP22 1-00 English
TDC-GP22_UG000291_1-00.pdf User Guide Demo kit 1-00 English
TDC-GP22_UG000265_1-00.pdf User Guide Evaluation system 1-00 English

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