Voltage controlled oscillator (VCO) is similar to a voltage to frequency converter (VFC), an oscillator which its output frequency is determined by a control voltage input. This is the figure of the circuit;
The frequency FO of this VCO is determined by input voltage (VIN), R1, and C as expressed in the following formula:
FO=(VIN-d)/(4hCR1),
Where d is the amplifier input voltage = 0.6V, h=hysteresis of DM1474 (typically = 1V). R2 must be equal to 2R1 for proper operation. Using this circuit, operation up to 5MHz can be achieved.
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