wdenny:
The voltage you applied to aref becomes the new reference... it's normal that you cannot read anything but 1023.
I am sorry, that doesn't make any sense. I am applying ~2.19mV at AREF, and grounding the analog input pin, I should get zero. When I apply 3.3V at AREF and ground the analog input pin, I get 0. Similarly, when I repeat this for 5V, I get 0. It is only when I apply the 2.2mV that I get 1023.
I forgot to mention in my first post, I tested all of this with a DVM, and I am infact getting the voltages as they should be at each pin and reference.
That is because you failed to study/read the datasheet about the electrical specification of the Aref pin and what's it's minimum voltage can be, approx +1.0 vdc.
Lefty