[time-nuts] 74HCT9046A Max. Operating Frequency

Chris Albertson albertson.chris at gmail.com
Mon Apr 28 10:16:27 EDT 2014


On Sun, Apr 27, 2014 at 11:41 PM, sg sg <micpreamp at yahoo.de> wrote:

> Thanks very much for your responses!
> ..
> The source is an AK4114 AES/EBU audio receiver, which has both master
> clock (24.576 MHz) and "word select" rate (48-192 kHz) outputs. Perhaps it
> is better to run the PLL at the latter? Any disadvantages from this?


So this is for clock distribution in a studio?   While our eras don't care
about nano seconds or even micro seconds we do care that long of the same
length have exactly the same number of samples.  In other words at a given
times into a track, all tracks have the same number of samples.    I think
what matters in this application is long term stability over days, weeks
and even years.   So the first step is always to figure out your
requirements and USE NUMBERS.

Next.  It is not "either/or"  you can put the PPL at 24..5MHz or 48K or you
can divide by 10 and put the PPL at 2.45Mhz.  or any place in between.

One question:  Why use the receiver as a clock source?  Most use something
independent like an OX or even Rb then use that to drive a DDS chip.

-- 

Chris Albertson
Redondo Beach, California



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