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:
