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" <p...@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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