TEMPERATURE_TO_FREQUENCY_CONVERTER_KELVIN

Published:2009/6/24 4:17:00 Author:May | From:SeekIC

This simple connection results in a direct conversion of temperature to frequency. The 1-mV/°K temperature output serves as the input to the buffer amplifier, and the oscillator drive current is scaled to be 298μA at 298°K (+25℃). Use of a 1000-pF capacitor results in a corresponding fre-quency of 2.98 kHz. A single-point trim for calibration is normally sufficient to give errors less than ±2℃ from -55℃ to +125℃. An NPO capacitor is preferred to minimize nonlinearity that results from capacitance drift.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/A-D_D-A_Converter_Circuit/TEMPERATURE_TO_FREQUENCY_CONVERTER_KELVIN.html

Print this Page | Comments | Reading(3)