应用功能:Precision Voltage-to-Frequency Converters The LM131/LM231/LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for analog-to-digital conversion, precision frequencyto-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.