Pls. note, ADC input is setup differential.
What if i do change input range of DelSigma?Let's say -inputADC +/- Vref/2. How does this affect resolution, as gain is achieved by switching capacitor in DelSig and not by OpAmp/Buffer in front of DelSig
Is this true?
As you have specified (Vref*2)/2^20 will be the range. The range which is related to the buffer is not depending on the resolution but rather affects the range of the individual pins.
So the voltage on the individual pins can vary according to the image on the right side. But at the end it should be within the differential range shown on the left side. For range calculation value specified on the left alone should be used. hope
I hope this clarifies your doubt.