We are currently selecting precision DAC chips, AD5760/80/90 (16/18/20 bits) are pin-compatible, while AD5781/91 (18/20 bits) is another line. Our product is aiming to support a A-16 bit, B-18 bit, C-20 bit versions, however, we prefer the ultimate performance of AD5791 but the AD5760/80/90 are pin-compatible, which means that one design may fit them all. We would like to know what is the major differences (beside footprint) of these two chips?
The AD5781/AD5791 offer better accuracy (INL and DNL for example) compared to AD5780/AD5790.
and yet, AD5780/90 have inferior INL, DNL, settling time performances than AD5781/91, but are more expensive than AD5781/91? It is contradictory.
There are other factors that could affect the price of a product. It doesn't always depend on the performance. It could be the anything that could affect the full factory cost, maybe from assembly or how it was tested.