Fully Comitted to LVDS as Comparitors

I working on a design where there will be some five sigma-delta ADCs and several specific level detect inputs each using an LVDS input pair as a comparator. So I'm pretty committed to this working.
The LVDS common mode range can work down to 50 mV and I"ll be testing that. I need to sense the voltage across a FET in an H bridge for over current or open load.
The ADCs need to have decent resolution, 12 bits at a minimum. I've seen an app note on this in a Lattice FPGA that achieved 12 bits. But it is hard to tell where the errors will creep in. It's not all about the noise. Non-linearity is also important.
I guess I'll have more info in a few weeks.
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Rick C. 

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