Voltage to Frequency Converter using AD654

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4 Voltage to Frequency Converter Circuit

A voltage-to-frequency converter (VFC) is an oscillator with a square wave at the output, and whose frequency is linearly proportional to its input voltage.

Voltage to Frequency Converter (VFC) is frequently mistaken for a voltage-controlled-oscillator (VCO). It has many benefits and better efficiency requirements that a voltage-controlled-oscillator does not have, such as dynamic range, low linearity defects, temperature, voltage stability, and many more that.

Voltage to Frequency Converter is feasible, which implies the frequency of the voltage conversion. Here, the IC AD654 describes the frequency converters’ operation, which is a monolithic voltage. An oscilloscope often sees the output square wave.

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Hardware Component

The following components are required to make the Voltage to Frequency Converter Circuit

S.no	Component	Value	Qty
1.	IC	AD654	1
2.	Voltage Regulator IC	LM7805	1
3.	Capacitor	0.1uF, 470uF/25V,1000pF	1, 1, 1
4.	Resistor	10K,1%	4
5.	Potentiometer	10K	1
6.	Power Supply	12V, DC	1
7.	Single Gauge Wire	Generic	6
8.	Breadboard	Generic	1

AD645 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of AD654

LM7805 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of LM7805

Voltage to Frequency Converter Circuit

Circuit Operation

In this section, we will discuss the circuit operation of the project of Voltage to Frequency converters. In this project, we are using a few low-cost components. The instruments used to test the circuit are Power supply (SMPS) 12V with Switch Mode, Meco Multimeter 108B+, and Hantech 600BE USB PC Oscilloscope.

1 percent metal film resistors are used to create the circuit, and the capacitor tolerance is not considered. During the survey, the room temperature was 22 ° C.