I have a question on using A-ref pin. If I take 2.5V precision reference from INA125 and connect it to A-ref pin, what should be the maximum analog input voltage to an Analog input pin? Can the range still be 0-5V? Or should it be 0-2.5V?
Homework : I read analogreference tutorial pages on arduino.cc, I can understand how it will change resolution but I am unable to find out the maximum voltage to analog pin - if 2.5V precision reference is used for A-ref. Thanks for your replies.
Specifications : Arduino Uno R3, Arduino 1.0 IDE, Ubuntu GNU/Linux 12.04.