• Input Stage (V-I Converter): Converts
  

  $V_{in}$
  to a proportional current (
  

  $I_{in}$
  ). An op-amp ensures
  

  $V_{in}$
  is applied across a precision resistor.
• Integrator: Charges a capacitor (
  

  $C_i$
  ) with
  

  $I_{in}$
  , creating a voltage ramp (
  

  $V_{ramp}=\frac{1}{C_i}\int I_{in}dt$
  ).
• Comparator/Trigger: Monitors the integrator output. When
  

  $V_{ramp}$
  hits a reference threshold (
  

  $V_{ref}$
  ), the comparator triggers a reset.
• One-Shot Timer/Charge Dispenser: Upon trigger, a fixed amount of charge (
  

  $Q=C_{ref}\times V_{ref}$
  ) is removed from the integrator, causing a rapid reset. The frequency of these resets constitutes the output frequency.

• Linearity: The frequency is directly proportional to
  

  $V_{in}$
  .
• Scale Factor: The ratio
  

  $1/(V_{ref}\times R_{in}\times C_i)$
  defines the Hz/V conversion gain.

• High Linearity: Modern ICs (like the AD652) achieve non-linearity as low as
  

  $0.002\%$
  .
• Dynamic Range: Typically covers 4 or more decades of frequency.
• Noise Immunity: The integration process helps filter high-frequency noise.
• Applications: Used in analog-to-digital conversion, isolation circuits, and telemetries.

• Synchronous VFC (AD652): Uses an external clock, ideal for high-precision, synchronized digital systems.
• Asynchronous VFC (AD537): Simple,, free-running oscillator type, good for general-purpose voltage-to-frequency conversion.

2m

VOLTAGE to FREQUENCY CONVERTER

YouTube · deva Sena

MT-028: Voltage to Frequency Converters - Analog Devices

INTRODUCTION. A voltage-to-frequency converter (VFC) is an oscillator whose frequency is linearly proportional to a control voltag...

Analog Devices

VOLTAGE TO FREQUENCY CONVERTER BASED ON THE ...

This report shows the design and implementation of a voltage-to-frequency (VF) converter circuit based on the Analog Devices AD652...

Instituto Geográfico Nacional

What is a Voltage-to-Frequency Converter - Ovaga Technologies

Oct 12, 2023 — A Voltage Frequency Converter (VFC), also known as a Voltage-Controlled Oscillator (VCO), is a device used for analog-to-digital s...

Ovaga

57s

Voltage to frequency converter | ANALOG AND DIGITAL ...

YouTube · ECE VIDEOS

Op Amp: Inverting, Non-Inverting, Circuits, Gain, Integrator

Nov 6, 2023 — Op Amp Integrators are essentially analogue calculators, performing the mathematical function of integration on an input signal. T...

StudySmarter UK

Analog Computer Vector Sum Calculator Design with Op Amp, BJT Transistors

Jan 17, 2024 — The applied input voltages across the input think film resistor aka precision resistor define the two input currents I1 and I2 tha...

YouTube

Draw & explain the dual slope analog to digital converter

Jan 5, 2026 — Block Diagram The integrator integrates the input voltage during the first phase. The comparator detects when the integrator outpu...

Filo

Design of Fast-Switching Circuit Blocks | Springer Nature Link

Sep 4, 2019 — A comparator detects, when the ramp reaches the upper level reference V ref,hi , and the ramp is reset again to V ref,lo by turnin...

Springer Nature Link

AD652 Monolithic Synchronous Voltage-to-Frequency Converter Data Sheet (Rev. C)

The gain of a voltage-to-frequency converter is the scale factor setting that provides the nominal conversion relationship, e.g., ...

Analog Devices

Build Fast VCAs and VCFs with Analog Multipliers Application Note (AN-309)

transparent (ie, they ( multiplier's signal paths ) introduce little signal delay or noise), you can use the IC to build voltage-t...

Analog Devices