Product Features

TDC-GP22 Ultrasonic Flow Converter

Next generation time-to-digital 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 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.

It is a 100% pin and functionally compatible upgrade to TDC-GP21. It has additional functionality compared to the TDC-GP21 - the first hit detection and the patented signal strength monitoring by pulse width measurement. This makes it the first complete and easy to use front-end chip for ultrasonic water meters and heat meters.

The TDC-GP22 has analog elements like the fire-pulse generator, zero-crossing detection and analog switches that simplify the design of ultrasonic flow meters. The first-hit detection makes TDC-GP22 suitable for high dynamic range ultrasonic water meters. The optimized power management of the various subsystems allows the operating current to be only a few µA at 2 Hz measurement rate. The TDC-GP22 is a good front-end solution for designing compact, low-cost ultrasonic flow meters and heat meters.

Part Descriptions

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