Frequency to Voltage Converter

In these applications, a pulse input at Fin is differentiated by a C-R network and the negative-going edge at pin 6 causes the input comparator to trigger the timer circuit. Just as with a V-to-F converter, the average current flowing out of pin 1 is Iaverage = i x (1.1 R1C1) x f. In this simple circuit, this current is filtered in the network RL = 100 k ohm and 1mF. The ripple will be less than 10 mV peak, but the response will be slow, with a 0.1 second time constant, and settling of 0.7 second to 0.1%.

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Frequency to Voltage Converter - Circuitos de Electronica