What is LM331?

Table of Contents

LM331 is basically a precision voltage to frequency converter from National Semiconductors. The IC has a hand full of applications like analog to digital conversion, long term integration, voltage to frequency conversion, frequency to voltage conversion.

What is the use of voltage to frequency converter?

Voltage to frequency converters (also called wide-range voltage-controlled oscillator) may be a component or electronic circuit which converts an input voltage to a linear or nonlinear frequency output.

What is converter frequency?

A frequency converter is an electric device that converts a current with one frequency to a current with another frequency. The voltage is normally the same before and after frequency conversion. Frequency converters are normally used for speed regulation of motors used to drive pumps and fans.

Does voltage increase with frequency?

The voltage of a transformer has a proportional relationship with frequency. Voltage of a transformer at a given flux density increases with frequency and also decreases with it.

Which of the following is frequency to voltage converter *?

FV converter WORKING In this circuit, lm331 is used to convert frequency into voltage. The voltage on the output is proportional to the frequency at the input. It is an 8 pins IC.

What is voltage to frequency converter How does it work?

A voltage-to-frequency converter (VFC) is an oscillator whose frequency is linearly proportional to a control voltage. The VFC/counter ADC is monotonic and free of missing codes, integrates noise, and can consume very little power.

How do you convert PWM to volts?

Fortunately, it is easy to convert a PWM output to an analog voltage level, producing a true DAC. All that is needed is a simple low-pass filter made from a resistor and a ceramic capacitor. The simple RC low-pass filter shown in the third photo converts the PWM signal to a voltage proportional to the duty cycle.

What is voltage to frequency ratio?

The Volt/Hz ratio is calculated by taking the rated voltage of the drive (such as 460 Volts) and dividing by the line frequency (typically 60 Hz or 50 Hz). For example, a 460 Volt drive running on 60 Hz has a ratio of: 460 V / 60 Hz = 7.67 V/Hz.

Is voltage proportional to frequency?

There is actually no relation between supply voltage and its frequency. Different countries set their parameters according to their convenience. Most of the American countries use 60Hz while others use 50Hz frequency. However if lower voltage is used, it is safe for people and animals.

Which is not a voltage to frequency converter?

7. Which is not a voltage to frequency converter? Explanation: BC541 is not a voltage to frequency converter. It is a bipolar junction transistor.

Which multivibrator is used as voltage to frequency?

The same circuit is also called a voltage-to-frequency converter (VFC) because a given voltage gives rise to a specific frequency. An astable multivibrator is used as voltage-controlled oscillator [see Fig. 7.13(a)].

Which IC is used as voltage to frequency converter?

IC AD654. AD654 is a voltage to frequency converter IC and comes in an 8-pin DIP package.

What is VCO frequency?

Glossary Term: VCO A voltage-controlled oscillator (VCO) is an electronic oscillator whose output frequency is proportional to its input voltage. An oscillator produces a periodic AC signal, and in VCOs, the oscillation frequency is determined by voltage.

What is the formula to calculate frequency?

The frequency formula in terms of time is given as: f = 1/T where, f is the frequency in hertz, and T is the time to complete one cycle in seconds. The frequency formula in terms of wavelength and wave speed is given as, f = 𝜈/λ where, 𝜈 is the wave speed, and λ is the wavelength of the wave.

What is the LM331 IC?

What is The VTF configuration of the LM331 IC?

A special configuration of the LM331 IC performs this conversion. Interestingly, this same IC also performs the FTV conversion as shown in the previous pages of this article. In the VTF configuration, the input voltage “VIN” feeds pin 7, and a proportional frequency “fOUT” appears at the output pin 3.

How to convert RT to CT in lm311 IC?

An LM331 IC performs this conversion. To use the LM311 IC the value of the timing resistor “Rt” and timing capacitor “Ct” has to be determined to scale the output voltage level (Vout). Luckily, there is a formula provided which is simple to use. Vout = fIN × (RL/RS) ×1.9 V × 1.1 × Rt ×Ct

How do you convert frequency to voltage in an IC?

The frequency to voltage conversion is attained by differentiating the input frequency using capacitor C3 and resistor R7 and feeding the resultant pulse train to the pin6 (threshold) of the IC. The negative going edge of the resultant pulse train at pin6 makes the built-in comparator circuit to trigger the timer circuit.