ANALOG_TO_PULSE_WIDTH

Published:2009/7/7 4:53:00 Author:May | From:SeekIC

Stripped-down version of dual-slope A/D converter integrates input current constantly but switches reference current into integrator each time clock pulse occurs. Accuracy of 0.1% makes circuit suitable for use in digital voltmeter. Reference current is switched out of integrator when output voltage reaches +4.5V. With values shown, using 100 kilohms for R1, maximum input current is 80 μA and full-scale voltage is 8 V. Article includes timing diagram and design equations.-N. A. Robin, Analog-to-Pulse-Width Converter Yields 0.1% Accuracy, EDN Magazine, Nov. 1, 1970, p 42-43.



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