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

Roman Sowa modular at go2.pl
Wed Feb 17 08:30:58 CET 2021


None of them would work in this scenario.
My humble suggestion is to try MCP606 as "good enough". It's a tad slow 
but if you plan to use it only for CV sampling at 1kHz, it's still fast 
as lighning.
Or other interesting opamps: LT1637, OPA340 to mention just 2

Roman

W dniu 2021-02-16 o 21:50, Jean-Pierre Desrochers pisze:
> 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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