BUY AD650JPZ https://www.utsource.net/itm/p/7427246.html
Volt to Frequency and Frequency to Volt Converter IC 1MHz ±0.02% 20-PLCC (9x9)
Description: The AD650JPZ is a low power, low noise, wide bandwidth, precision, monolithic, voltage-to-frequency converter (VFC). Features: Low power: 5 mW Low noise: 0.5 Hz/V Wide bandwidth: 0.1 Hz to 1 MHz Precision: 0.1% Monolithic: Integrated on a single chip Applications: Frequency to voltage conversion Frequency measurement Frequency control Pulse rate measurement Pulse rate control Pulse width modulation Pulse width control Frequency modulation Frequency control (For reference only)