[time-nuts] AD5791 for EFC control ?

paul swed paulswedb at gmail.com
Sun Apr 21 01:01:54 UTC 2013


Bert
I was looking at your price in the leading email. You had ~$8. So thats
what I thought it was.
I may have misread it sorry.
Regards
Paul
WB8TSL


On Sat, Apr 20, 2013 at 7:59 PM, Herbert Poetzl <herbert at 13thfloor.at>wrote:

> On Sat, Apr 20, 2013 at 08:14:06PM +0000, Poul-Henning Kamp wrote:
>
> > I looked at the DAC1220 first, but in an EFC application it
> > worries me to no end that it is a Sigma-Delta DAC.
>
> > Even if I feed it a clock divided down from the OCXO you're
> > EFC'ing, to avoid beatfrequency effects, I would still worry
> > about harmonic effects and noise.
>
> > Also, the noise-spec is pretty horrid, almost a
> > microvolt/sqrt(Hz) all the way to one kHz.
>
> > For comparison the AD5791 is purely static and its noise is
> > below 10 nv/sqrt(Hz) from 5Hz and up.
>
> At a price of ~100 USD (100pcs for ~50 USD each)
> it's also in a different price range as the DAC1220
> which can be bought for less than 20 USD (~8 USD
> when you buy 100).
>
> best,
> Herbert
>
> > --
> > 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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