At this level even barometric pressure changes con be a problem. On Mon, Aug 17, 2015 at 10:58 AM, Andreas Jahn <andreas_-_j...@t-online.de> wrote:
> 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" <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 >>>> >>>> >>> _______________________________________________ >>> volt-nuts mailing list -- volt-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >>> and follow the instructions there. >>> >> >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. >> > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > -- *John Phillips* _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.