SLG47004, This application note describes the implementation of a simple tracking ADC based on digital rheostats

SLG47004, This application note describes the implementation of a simple tracking ADC based on digital rheostats. No external components and no special tuning procedure are required for the proposed ADC structure. Also, the circuit has much better PSRR and temperature drift than a capacitor based counter type ADC. The proposed ADC can be used for monitoring slow-changing signals like temperature, battery voltage, and others