You actually have to look in AES11 and see that Grade 1 is specified to
be within +/- 1 ppm with a minimum capture range of +/- 2 ppm while
Grade 2 is +/- 10 ppm with a minimum capture range of +/- 50 ppm.
AES5 does give you the +/- 10 ppm minimum requirement for the source,
but nothing about the receiver.
Cheers,
Magnus
On 04/28/2014 02:45 PM, Tim Shoppa wrote:
I suspect the TCXO might not have enough range because fundamentally the
VCTCXO are only 10ppm range and your AES3 source could well be much further
off unless it is being run from a better master clock than a TCXO. +/-50ppm
is the hope for pro-grade AES3 streams. I think AES5 is aiming towards
clock rates in the 10ppm ballpark.
On Mon, Apr 28, 2014 at 2:41 AM, sg sg <[email protected]> wrote:
Thanks very much for your responses!
For 24.576 MHz VCXO, the fractional change in frequency will be in
multiple
ppm not octaves, and I would naturally gravitate towards a simple diode
DBM.
To avoid lock issues I'd still want a phase-frequency detector; the PLL
bandwidth in my case is very low (a few Hz), which makes the lock range
tiny if a "phase only" detector is used (I've run into this recently with
some other project).
24,576 MHz is 128x192 kHz which makes essentially any divide by 2^N chip
capable of the frequency a target. Is your reference signal also 24,576
MHz or some other frequency?
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?
Regards,
Samuel
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