Hi Ricardo,
Apologies for the delay. I was looking for any application note that includes the built in test but haven't found one yet. Anyway base from what I understand the comparator would work as a window comparator and the reference will be the allowable error. The idea is the picture below. With regards to the price, the AD2S1210 is a newer product as compared to the AD2S80, therefore this has been optimize cost wise, like this is tested at shorter test routine and is fabricated on a standard CMOS process.
Regards,
Jonathan