[time-nuts] Allan Deviation question

Hal Murray hmurray at megapathdsl.net
Fri Jul 6 15:27:52 UTC 2012


> I think a number of higher-end sound cards accept a "word clock" or  "world
> clock" (I've seen it both ways) that's intended to allow syncing  to an
> external source.  The challenge I've seen is that the frequency  (either in
> the 12 or 24 MHz range) is one that's not simple to  synthesize precisely
> (i.e., zero offset from nominal) and with low  jitter/phase noise from a 5
> or 10 MHz reference. 

What happens if you just feed them 10 MHz when it expects 12?

I'd expect it's just the clock to the ADC and DSP.  If so, everything will 
scale.


-- 
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