[time-nuts] 74HCT9046A Max. Operating Frequency

Magnus Danielson magnus at rubidium.dyndns.org
Mon Apr 28 16:19:09 EDT 2014


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 <micpreamp at yahoo.de> 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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