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rom pure DC measurements.
op amps like ADA4522 or OPA189, with good thin-film or bulk metal foil resi stors. As for Sigma-Delta ADCs - the champions are currently in the AD7xxx family - AD7177-2 or the newer AD7768. To get more than 20 meaningful bits you need an external buried zener reference. Or if you go for ratiometric s etup - these ADCs can output their internal Vref. They come with tons of ot her features too.
ished by the same guys:
Here's a better link:
Cheers, Nikolai