[time-nuts] AD5791 for EFC control ?

[paul swed]

Thats a great question and not to distract the thread. The modern
references seem far superior to the old ones that might be as simple as a
zener diode. However the internal references are almost always in a semi
temperature controlled environment near the oven.
Kind of interesting trade offs.
Regards
Paul
WB8TSL


On Fri, Apr 19, 2013 at 10:40 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <20130419134411.GB29827 at MAIL.13thfloor.at>, Herbert Poetzl
> writes:
> >On Fri, Apr 19, 2013 at 09:20:05AM -0400, EWKehren at aol.com wrote:
>
> >Texas Instruments has a number of precision DACs for a
> >very reasonable price, for example the DAC1220 (20bit
> >low power delta-sigma, ~8 USD) and precision voltage
> >references to go with (e.g. REF5050, ~2 USD).
>
> That reminds me of another thing: I wonder if one is better off
> using a external precision reference or the VREF output from the
> OCXO ?
>
> It's probably one of those "sometimes" things...
>
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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