[sdiy] ADc & DAC voltage dividers.. fixed resistors values finally..

Jean-Pierre Desrochers jpdesroc at oricom.ca
Tue Feb 16 21:50:31 CET 2021


So far the precision opamps I have on hands are:
OPA2277PA
OP177G
OP275G
LF412CP
I don't think they fit the requirements..
Any ideas for a good 16 bits ADC front end opamp ?


-----Message d'origine-----
De : Mike Bryant [mailto:mbryant at futurehorizons.com] 
Envoyé : 16 février 2021 14:52
À : Jean-Pierre Desrochers; 'Roman Sowa'; synth-diy at synth-diy.org
Objet : RE: [sdiy] ADc & DAC voltage dividers.. fixed resistors values finally..

> But to me 5V rail to rail opamps will never reach 0 neither +5.0v at their output when these values show at the input..
> Close values but not the original ones.
> Or maybe I am wrong on that.

The ones for ADCs have FET output stages so they'll happily go all the way to zero accurately and pretty near to the positive rail.  And many ADCs don't go all the way up to 5V anyway as they need some headroom for the internal op-amp on the voltage reference





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