BUY ADC7814 https://www.utsource.net/itm/p/101932.html
Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER
Description: The ADC7814 is a low power, 8-bit successive approximation analog-to-digital converter (ADC). Features: - 8-bit resolution - Single supply operation (2.7V to 5.25V) - Low power consumption (1.2 mW) - Fast conversion time (150 μs) - Low input offset voltage (±1 mV) - Low input bias current (±1 nA) - Low input offset current (±2 nA) Applications: - Data acquisition systems - Portable instrumentation - Battery powered systems - Industrial process control - Automotive systems (For reference only)