Should not be a problem. I have seen it working with lesser DSR
I design for automotive. I have limited experience on various supply
options. You can definitely make it working from 2.8V to 3.5V supply
range.
My modeling says that you should not have problem upto 1.8 volts,
provided you choose proper architecture. But no silicon data for this.
I would suggest u to keep trimming options open and explored for all
supporting analog blocks. Be worried about your buffer/PGA
Keep an eye on 1/f noise. That will be killer.
Regards,
Sumit