Current-To-Frequency Converter

  
Teledyne Semiconductor`s Type TSC9402 IC is eminently suitable as an inexpensive current-to-frequency conver
Current-To-Frequency Converter - schematic

ter. The maximum input current of the design shown in the diagram is 10 (input voltage range is 10 mV to 10 V), while the output frequency range extends from 10 Hz to 10 kHz. The conversion factor is exactly 1 kHz/. The factor can be altered by changing the value of Rl—as long as the maximum input current of 10 is not exceeded. The circuit has two outputs. That at pin 8 is a short-duration pulse, whose rate is directly proportional to the input current; that at pin 10 is a square wave of half the frequency of the pulse at pin 8. Calibrating the circuit is fairly simple. Connect a frequency meter to pin 8 (preferably one that can read tenths of a hertz) and connect a voltage of exactly 10 mV to the input (check with an accurate milli-voltmeter). Adjust PI to obtain an output of exactly 10 Hz. Next, connect a signal of exactly 10 V to the input and check that the output signal has a frequency of 10 kHz. If this frequency cannot be attained, shunt CI with a small trimmer or replace Rl by a resistor of 820 kfi and a preset of 250 KOhmhm.




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