BUY LM331N/NOPB https://www.utsource.net/itm/p/832758.html
LM231A/LM231/LM331A/LM331 Precision Voltage-to-Frequency Converters; Package: MDIP; No of Pins: 8; Qty per Container: 40/Rail
Description: The LM331N/NOPB is an adjustable precision voltage to frequency converter from Texas Instruments. Features: * Wide supply voltage range: 3V to 32V * Low power consumption * High accuracy: 0.1% * Low temperature drift * High frequency stability Applications: * Frequency synthesis * Frequency to voltage conversion * Pulse rate measurement * Motor speed control * Process control (For reference only)