VOLTAGE TO FREQUENCY CONVERTER 9400



This section investigates the Teledyne 9400 series, which can be used as voltage to frequency or frequency to voltage converters. The series includes the 9400, 9401, 9402 converters. These converters have the same internal circuitry and connection diagrams, but they differ slightly in electrical characteristics. A complete V/F or F/V system can be formed simply by using two external capacitors, three resistors and a reference voltage. In addition, the 9400 series consist of CMOS and bipolar devices that can operate on dual or single supply voltages.

VOLTAGE TO FREQUENCY CONVERTER


The 9400 is designed for pulse and square wave outputs having a frequency range of 1Hz to 100KHz. Furthermore, the input can be either current or voltage, and the output can interface with most forms of logic. The equivalent circuit consisting of an integrator, comparators, a delay network, a divide by 2 network and open collector output transistors. The input current is converted to a charge by the integrating capacitor and shows up as a linearly decreasing voltage at the output of the op amp integrator.

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