[time-nuts] AD5791 for EFC control ?
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Apr 20 20:14:06 UTC 2013
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.
--
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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