Hi John, I think they are all serial unipolar ADCs. It looks like the real differences have nothing to do with the description. You can get two different packages, two different nonlinearity specs, and two different temperature ratings. Very strange how Digikey has decided to differentiate them! Best regards, Bob On Wed, May 6, 2015, at 12:45 PM, John Gardner wrote: > This part comes in flavors - Digikey's description table is here... >=20 > http://tinyurl.com/o86d8ro >=20 > Under "Descriptions" distinctions such as as "SER", "SRL", & "UNIPOL" >=20 > are noted. The data sheet is not forthcoming about what this means, >=20 > and Google does'nt seem to know either. >=20 > Could someone explain, or point me at an explanation? >=20 > Thanks. --=20 http://www.fastmail.com - Choose from over 50 domains or use your own --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .