The ADuM5202 uses standard CMOS structure in its logic inputs, in particular it has ESD protection diodes that connect to VDD and GND. First, your question about the input voltage tolerance when running at 3.3V. I looked over your application and schematics. I am the ADI applications engineer that supports the isoPower devices. I am not sure of ADI's sample policies, TI seems even with the National merger, to be very liberal in their samples programs as well. Any possibility of sampling these devices? Probably Don would be interested in getting a couple to try in his development, and myself down the road if I ever get a grant to develop a semi invasive medical device. I have seen these chips as well as some similar from TI, the AVNET eNewsletter is a very nice resource (its free y'all) and the FAEs I have talked to are great resources as well. I may be looking at some ADI devices (A/D DAC 1-10Ms/s range) though mostly learning to use them with the prop. Hey, ADI, nice to know you are out there.
I believe this may be a single part pricing and you should be able to do significantly better in volume. It looks like the community has given you some great advice but I wanted to respond to the pricing that you posted. I am from Analog Devices and responsible for this product.
