VOLTAGE_TO__FREQUENCY_USING_IC_TIM_ERS

Published:2009/7/7 4:59:00 Author:May | From:SeekIC

Two 322 IC timers and single 301A opamp provide all functions required for charge-balancing type of voltage-to-frequency converter, including integrator, level sensor or comparator, precision mono, and gated current source. Circuit accepts control voltage inputs of 0 to -10 V, corresponding to output pulse stream range of 0 to 10 kHz. Article describes operation in detail. R4, should be 4.7 megohms. Output pulses of comparator A3 trigger mono A2, which generates pulse having duration t1 that saturates Q1, to force reference current l2, into summing point of opamp integrator.-W.G. Jung, Take a Fresh Look at New IC Timer Applications, EDN Magazine, March 20, 1977, p 127-135.



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