Thank you. That was going to be my next question. Although the sensor is powered off 5v, the output is only between 0 and 2.5v.
Before using the ADS I was using the internal 1.1v reference to improve reolution a little.
So in this case I would power both off the 3.3V rail? The Atmega328 is still using 5v so that is ok, correct?
Thanks again for your time and input.