LM231AN/NOPB Integrated Circuits (ICs)

Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us:   sales@allicdata.com

1. Describe

LM231AN/NOPB Series Voltage to Frequency Converters Ideal for simple low-cost circuits For analog-to-digital conversion, precision frequency Voltage Conversion, Long Term Integration, Linear frequency modulation or demodulation, and many Other functions. Output when used as voltage A frequency converter is a sequence of frequency pulses proportional to the applied input voltage. Therefore, it provides all the inherent advantages voltage-to-frequency conversion technology, and is Easy to apply over all standard voltage frequency ranges Converter application. In addition, the LMx31A achieves a new high accuracy versus temperature that can only be achieved by Expensive voltage frequency modules. Additionally, the LMx31 is ideal for use in digital systems Low supply voltage and low cost analog-to-digital conversion in microprocessor control system. Also, the frequency from a battery powered voltage-to-frequency converter can be easily steered Isolation to high common-mode levels is provided by a simple opto-isolator. The LMx31 uses a new temperature compensated bandgap reference circuit to provide superior accuracy over Supply voltage down to 4 V over the entire operating temperature range. Precision timer circuit with low bias current without degrading the fast response required for 100 kHz voltage-to-frequency conversion. and Outputs capable of driving 3 TTL loads, or high voltage outputs up to 40 V, but are short circuit protected VCC.

2. Feature

    1. Guaranteed linearity of 0.01% max

    2. Improve the performance of existing voltage-to-frequency conversion applications

    3. Split or single supply operation

    4. Operates from a single 5V supply

    5. Pulse output compatible with all logic forms

    6. Excellent temperature stability: ±50 ppm/°C (max)

    7. Low power consumption: 15 mW typical at 5 V

    8. Wide dynamic range, 100dB minimum at 10kHz full-scale frequency

    9. Wide full-scale frequency range: 1 Hz to 100 kHz

  10. low cost

3. Application

    1. Voltage to frequency conversion

    2. Frequency to voltage conversion

    3. Remote sensor monitoring

    4. Tachometer

4. Pin configuration

5. Pin Description

6. Function description

The LM231AN/NOPB operates over a wide voltage range of 4 V to 40 V. The voltage at pin 2 is regulated to 1.90 VDC for all i values between 10 μA and 500 μA. it can be used as voltage references for other components, but care is taken to ensure current is not drawn from it, which may Reduce the accuracy of the converter.

7. Device functional mode

The output drive transistor saturates pin 3 with an on-resistance of approximately 50 Ω. In the event of overvoltage, The output current is actively limited to less than 50 mA. If the voltage on pin 7 is higher than pin 6 when pin 5 crosses ⅔ VCC, the LMx31 internal flip-flop will not Reset, the current at pin 1 will continue to flow, trying to make the voltage at pin 6 higher than pin 7. this Condition usually applies to start conditions or situations where an overload voltage is present at the signal input. middle This overload output frequency will be 0. Once the signal returns to operating range, The output frequency will recover.