Protecting ADC Inputs
A common issue that arises when designing an ADC circuit is how to protect the ADC inputs from overvoltage. The protection of ADC inputs has many scenarios and potential solutions. ADCs from all vendors have similar needs in this respect. This article gives insight into what issues can arise in the case of overvoltage, how it occurs, and potential remedies. …
by Alan Walsh
https://arduino.stackexchange.com/questions/44830/arduino-protecting-analog-input-with-internal-voltage-reference