Question on ADC

[aiva]

I have an ADC with nonlinearity 0.0015% (AD7714) but want to get beter accuracy in measuring signal lower then 1/2 REF.

Whether the error of nonlinearity decreases at increase in factor of amplification of the entrance amplifier? Thanks

 

[aiva]

Whether the error of nonlinearity decreases at increase in factor of amplification of the entrance amplifier?

O, please, help me. I think yes, but i'm not sure
Or it is jast fullish quastion?

 

[Nigel Goodwin]

It's probably a foolish question! - and doesn't make much sense either?.

 

[Oznog]

Look at your device's spec sheet. There should be info on how reducing Vref will affect the linearity and offset.

If the spec sheet doesn't say, then it's hard to draw any generalizations. Perhaps you could contact tech support for the mfg. I've done this many times with good results.

 

[Paul Obrien]

Amplify the input signal as the non-linearity is a function of the conversion, the bigger the input signal the less obvious the non-linearity.

 

[aiva]

Thanks all for the answer
Certainly it is necessary to contact the manufacturer. I should guess. Obviously it is the shortest way. Successes to you.