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TDC-GP21 Ultrasonic flow converter

Time-to-digital converter with integrated analog frontend

 

TDC-GP21 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. An optimized power managements of the various units brings don the operating current to a few µA at 2 Hz measuring rate.

Key Features

  • 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

Key Benefits

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

Product Facts

Analog Frontend
First wave detection
Amplitude measurement
Number of hits 3
Resolution [ps] 22
Operating supply range 2.5 to 3.6
Interface SPI
CPU -
Firmware
Memory
GPIO -
Ambient temperature range [°C] -40°C to +125°C
Package QFN32

Additional Information

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