Must be military prices. If using 5 PPM resistors in the build a reference much better than that isn't needed, especially if the temperature is somewhat controlled, like time nuts do. A commercial 3 PPM/C part, the LM4140A, is $4.54 each in singles. At 2.2uV p-p it's reasonably quiet as well.
Considering stability influences, what provides the DAC reference? That's rather important as well. Bob LaJeunesse I'd also note the 2 PPM ratio tracking dividers, the MAX549x series, can be had in the $3.49 range, also not all that expensive. >________________________________ > From: Bob Camp <li...@rtty.us> >To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency >measurement <time-nuts@febo.com> >Sent: Friday, January 31, 2014 7:17 PM >Subject: Re: [time-nuts] EFC divider resistors > > > >... A good voltage reference will set you back about $50 or so. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
