Timer_F_V_converter

Published:2009/7/23 23:52:00 Author:Jessie | From:SeekIC

Fig.12-18 This circuit uses an LM122 timer as a basic F/V converter. The LM122 timer as a basic F/V converter. The LM122 output pulses are averaged with a simple one-pole filter to provide a dc output that is directly related to the trigger input frequency. The pulse width is adjusted with R2 to provide initial calibration at 10kHz. Linearity is about 0.2% for a 0-to 1-V output. A series RC network across the meter provides damping and will improve response at very low frequencies.



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