Thanks Bob and Joseph. I nailed it now! The problem was that my code was toggling between the RTD readings and reading the Thermistor. Once I measured on REFOUT I could see it turning on/off. The voltage on AIN8 is correct, but this switching just won't work as the settling takes too long time. The 10uF cap is there per the Application note on ratiometric measurements and it does indeed look like it messes this up :-/ If I only read the Thermistor, I can read the voltage correctly. If I try to toggle between RTD's and Thermistor, it goes bananas right away. I'll just have to find an analog pin somewhere else I guess?
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