[time-nuts] AD5791 for EFC control ?
Herbert Poetzl
herbert at 13thfloor.at
Sat Apr 20 19:59:25 EDT 2013
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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