Hi If you look at the standard chips that do this, they expand the accumulator. The D/A is limited to the “normal” number of bits based on the max clock frequency. ( = no free lunch …).
Bob > On Oct 7, 2020, at 5:37 PM, Mike Feher <[email protected]> wrote: > > So, you are increasing the length of the accumulator. What about the D/A > then? 73 - Mike > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell NJ 07731 > 848-245-9115 > > -----Original Message----- > From: time-nuts <[email protected]> On Behalf Of Bob kb8tq > Sent: Wednesday, October 7, 2020 1:55 PM > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Aging 5065A ? > > Hi > > The “normal” 32 bit DDS chips only get you just so far in terms of tuning > resolution. > If you want to run a fixed / well regulated C Field, a DDS with (say) 48 bits > would allow you to tune the device well past parts in 10^-15. There are > several DDS chips out there that will do this. Some of the more common ones ( > = what you see on eBay) have issues …. > > Bob > >> On Oct 7, 2020, at 12:11 PM, Mike Feher <[email protected]> wrote: >> >> Just curious Bob. What do you mean by higher resolution? Would that be >> a longer accumulator and more bits in the D/A? 73 - Mike >> >> Mike B. Feher, N4FS >> 89 Arnold Blvd. >> Howell NJ 07731 >> 848-245-9115 >> >> -----Original Message----- >> From: time-nuts <[email protected]> On Behalf Of Bob >> kb8tq >> Sent: Wednesday, October 7, 2020 11:11 AM >> To: Discussion of precise time and frequency measurement >> <[email protected]> >> Subject: Re: [time-nuts] Aging 5065A ? >> >> Hi >> >> Yup, Bert has lashed up at least one that way ( I have it here in the >> basement). >> I am working on a board with a higher resolution DDS than the typical eBay >> parts. >> >> Bob >> >> ions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go >> to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
