LM331 Precision Voltage to Frequency Converter – Datasheet

The LM331 family of voltage-to-frequency converters is ideally suited for use in simple low-cost circuits for analog-to-digital conversion, precision frequency to voltage conversion, long-term integration, linear frequency modulation or demodulation, and many other functions. The output when used as a voltage-to-frequency converter is a pulse train at a frequency precisely proportional to the applied input voltage. Thus, it provides all the inherent advantages of the voltage-to-frequency conversion techniques and is easy to apply in all standard voltage-to-frequency converter applications.

The LM331A attains a new high level of accuracy versus temperature which could only be attained with expensive voltage-to-frequency modules. Additionally, the LM131 is ideally suited for use in digital systems at low power supply voltages and can provide low-cost analog-to-digital conversion in microprocessor-controlled systems. And, the frequency from a battery-powered voltage-to-frequency converter can be easily channeled through a simple photo isolator to provide isolation against high common-mode levels. The LM331 utilizes a new temperature-compensated band-gap reference circuit, to provide excellent accuracy over the full operating temperature range, at power supplies as low as 4.0V.

LM331 Pinout

LM331 Pin Configuration

Pin No	Pin Name	Description
1	CURRENT OUT	Current Output Pin
2	Ref: CURRENT	Reference Current Pin
3	FREQ: OUT	Frequency Output Pin
4	GND	Ground Pin
5	R/C	Resistor/ Capacitor Pin
6	THRESHOLD	Threshold Pin
7	COMP: IN	Comparator Input
8	Vs	Supply Voltage Pin

LM331 Features

• Guaranteed linearity 0.01% max
• Improved performance in existing voltage-to-frequency conversion applications
• Split or single supply operation
• Operates on single 5V supply
• Pulse output compatible with all logic forms
• Excellent temperature stability, g50 ppm/§C max
• Low power dissipation, 15 mw typical at 5V
• Wide dynamic range, 100 dB min at 10 kHz full scale frequency
• Wide range of full scale frequency, 1 Hz to 100 kHz
• Low cost

Application

• Analog-to-digital conversion
• Precision frequency to-voltage conversion
• Long-term integration
• Linear frequency modulation or demodulation

You can download this datasheet for LM331 Precision Voltage to Frequency Converter – Datasheet from the link given below: