dhenry:
I don't know your setup that well but if you are using dividers or voltage references, think about what kind of resistors /Vref you will need in order to maintain the comparability of 16-bit adc from source to source.
dhenry, I'm slowly working out the route of least resistance (metaphorically) and going over something you said...
Would you be able to explain what your references above mean - thanks.