[time-nuts] Interfacing a 8dBm sine output of an OCXO to adigital logic standard
cfmd at bredband.net
Fri Sep 16 18:13:52 EDT 2005
From: "Richard \(Rick\) Karlquist \(N6RK\)" <richard at karlquist.com>
Subject: RE: [time-nuts] Interfacing a 8dBm sine output of an OCXO to adigital logic standard
Date: Fri, 16 Sep 2005 08:13:40 -0700
Message-ID: <MGEKKFGEAIKJOOPJPGIKCEAMFMAA.richard at karlquist.com>
> > http://www.icst.com/datasheets/ics2305.pdf
> > ICS has many interesting clock chips which can be used for other
> > uses than what they were designed. Worth a browse.
> > --
> > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> This chip has 200 ps of jitter! There is no way you would
> want to use this with an OCXO.
200 ps at 66,67 MHz of jitter is bad, really bad. When I see that on
oscillators I toss it unless I know it is for some quite tolerant part of the
design. 2 ps RMS or less is what I usually expect to see from oscillators.
I wonder if that chip isn't really a DLL after all. They usually are.
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