Description: In the end of November 2010, Germany acam for on the basis of the original, but also specifically for some of the characteristics of the ultrasonic heat meters to conduct a more in-depth research and improvement, and ultimately launched a new generation of ultrasonic heat meters designed chip TDC- GP21. The chip QFN32-pin package. The chip while the addition with the TDC-GP2, additional integrated signal processing of the analog portion of the ultrasonic heat meters, such as analog switches, and low-noise chopper-stabilized (automatic temperature voltage calibration) analog signal and internal integration required for temperature measurement Schmitt trigger, the design and development of ultrasonic heat meter is very simple, and greatly reduce material and labor costs, and measuring the quality and power raised to an unprecedented level, to achieve a higher integration, lower power consumption, more accurate ultrasonic heat meter program. Performance can be achieved by the TDC-GP21, th
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