I have problems understanding differential ADC, and principle of its voltage references. Lets assume that ADS1120 REFP is connected to 4.096V and REFN is connected to GND (0V). What is the voltage that defines code area where conversion result is 0x0000? Is it the one connected to the REFN? When measuring unipolar voltage, it will never go below 0V, and thus we will loose one bit of resolution. Would it be possible to use dual output reference like REF2041 and to connect 4.096V output to REFP and 2.048 output to REFN, and thus achieve 16bit resolution in single ended mode?