[volt-nuts] Building a high resolution DAC

[Daniel Mendes]

Look at LT6655 datasheet, page 14, about long term drift of MS8 versus 
LS8 package. If others refferences are as bad regarding moisture then i 
think this may be a problem at this level of accuracy.....

Daniel

Em 17/08/2015 13:29, Andreas Jahn escreveu:
> Hello,
>
> I would rather use a reference with lower tempco than the LT1021. 
> (typical 7ppm/K)
> E.g. (selected) AD586LQ or MAX6350.
> Or at least LT1236AILS8 with around 3ppm/K.
> The self heating alone gives around 3 deg C temperature difference.
>
> With best regards
>
> Andreas
>
> Am 17.08.2015 um 18:19 schrieb Attila Kinali:
>> On Mon, 17 Aug 2015 15:38:37 +0000
>> "Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
>>
>>
>>>> You mean the AD7177-2? That seems to be quite hard to get by.
>>> I was thinking of the TI part intended for seismic applications.
>> Hmm. The ADS1262 does indeed seem quite easily available.
>>>> My goal was to stay below 30-40USD for the whole DAC if possible.
>>>> But yes.. it might not be possible.
>>> I don't think it is.  The necessary voltage reference will set you
>>> back almost that much...
>> I thought about using the LT1021. I don't need the long term
>> stability of the LTZ1000 and the LT1021 is available for less than 
>> 10USD.
>>
>> But from the discussion here, think i have to go back and see whether
>> i really need such an high resolution or whether 20bit wouldnt be 
>> already
>> enough. Then i could get away with a 20bit DAC like the DAC1220.
>>
>> Thanks
>>
>>             Attila Kinali
>>
>
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