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From: Martin Griffith
Subject: Re: Low jitter xtal oscilliator
Date: Thu, 21 Nov 2002 12:08:28 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Thu, 21 Nov 2002 12:08:28 +0000 (UTC)
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On 20 Nov 2002 16:10:48 -0800, firstname.lastname@example.org (Tom Bruhns) scribbled:
>To start with, you could do better than the 74HCU04 output buffer.
>I think the bypassing is a bit silly. What's required here is
>rejection of noise on the power supply lines (coming in) and you don't
>need all that bypassing to do that. There are more efficient ways.
I was going to use a separate LM317 for the crystal supply, I thought
that stepped C array was a bit of "audiophile bullshit"
>What is the claimed phase noise performance? Is it as good as you can
>do with a good commercial "can"?
The article did not provide any specifications, that why I posted the
question, does it look a reasonable circuit in the first place, being
not very knowledgeable about crystal oscillators
I've just been looking at the CMAC site, they didnt supply any jitter
info on the data sheets :(
>Beware of what noise on the power supply will do to the phase noise.
>Have you determined what phase noise (or jitter) is required for your
>application? Will this circuit meet that need? Will a simpler
>circuit meet that need?
An old AES paper shows this graph, this was when 16bit ADC/DACs were
so better than this, some guys are saying that 9pS jitter is too much
these days, with 24bit converters being standard issue
>What other needs do you have? Will you need to distribute the same
>clock to multiple users, or is it used only one place?
yes, to maximum of 4 devices, and a divide by 256 for a wordclock
>Martin Griffith wrote in message news:...
>> Any suggestions/comments on this circuit as digital audio master
>> Warning: Tolkien is hobbit forming
Minimum safe distances between street musicians and the public:
Violinist: 25 feet
Bad Violinist: 50 feet
Tone Deaf Guitar Player who knows 3 chords: 75 feet
15 year-old Electric Guitar Player with Nirvana fixation: 100 feet
Accordionist: 60 miles
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