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Voltage-to-frequency converter chips provide a signal frequency output as a function of an analog input voltage. A voltage-to-frequency converter chip is widely used for applications where a temperature proportional output is required in a phase-locked loop. In a voltage to frequency converter circuit, an operational amplifier acts as an input to the voltage-to-frequency converter chip. The input current in the voltage to frequency circuit is directed to a NPN transistor to start its operation. Next, a 1mA current and full scale input voltage is fed to the voltage to frequency converter circuit. This voltage provides bias levels and starts charging current to the capacitor, which in turn generates low non-linear square wave frequency output. There are many types of voltage-to-frequency converter chips. Examples include an AD537 voltage to frequency conversion chip and an AD7740 voltage to frequency conversion chip. AD537 voltage-to-frequency converter chips are widely used as an accurate reference generator and a precision oscillator system. An AD7740 voltage to frequency converter chip is low cost, ultra-small frequency converter, used for isolation of high common-mode voltages. Other voltage-to-frequency converter chips are commonly available.

How Voltage-to-Frequency Converter Chips Function

There are several ways in which voltage-to-frequency converter chips function. A voltage-to-frequency converter chip works by supplying a full-scale voltage to the NPN transistor and then charging the integrated capacitor of the circuit. Low-voltage systems will in turn then generate signal frequency outputs in the form of square waves. An AD537 voltage to frequency conversion chip should have a voltage supply in the range of 5 to 36 volts and a linearity of +/-0.05% FS. In addition, an AD537 voltage to frequency conversion chip should have a thermometer output of 1mV/K and be fitted with a versatile input amplifier. An AD7740 operates from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply and consumes typically 0.9 mA when the input is unbuffered. An AD7740 does not require external resistors and capacitors to set the output frequency. The maximum output frequency of an AD7740 is set by a crystal or a clock. Voltage-to-frequency converter chips are designed and manufactured to meet most industry specifications.


Voltage-to-frequency converter chips are used in many applications. Voltage-to-frequency converter chips are widely used in two-wire data transmissions and in transducers. Voltage-to-frequency converter chips are also used in power sectors, electronics laboratories as oscillator circuits, and reference

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