[volt-nuts] Building a high resolution DAC

Andreas Jahn Andreas_-_Jahn at t-online.de
Mon Aug 17 12:29:13 EDT 2015


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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