[volt-nuts] Building a high resolution DAC

[Andreas Jahn]

Hello,

its not only the plastic (epoxy) package.
Its also the epoxy PCB which creates package stress to the die.
And I do not believe that any "slots" make it significantly better.
Thats why I use the AD586LQ; and soldering only one pin to the PCB.
(the others with thin VERO-wire).

With best regards

Andreas

Am 17.08.2015 um 18:46 schrieb 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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