LM331N/NOPB, Прецизионный конвертор напряжение-частота, [DIP-8]

Voltage/Frequency Converters, National Semiconductor
National Semiconductor's economic Voltage to Frequency converters feature low power consumption and a wide dynamic range, and are ideal for analogue-to-digital conversion applications.

Also available in this range are Frequency to Voltage converters that are well suited to applications such as tachometers and speed governors.