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fmak 4th June 2008 07:17 AM

Accurate 50ppm Crystals
 
Can someone please point to a source of at least 50ppm 11.2896 crstals? Not XOs. Ideally in UK

gmarsh 4th June 2008 11:56 AM

Digikey UK (uk.digikey.com), part number 300-8429-ND. 30ppm.

peranders 4th June 2008 12:30 PM

Re: Accurate 50ppm Crystals
 
Quote:

Originally posted by fmak
Can someone please point to a source of at least 50ppm 11.2896 crstals? Not XOs. Ideally in UK
If the crystal will be used in a DAC 1000 ppm is good enough and certainly 200 ppm.

fmak 4th June 2008 12:37 PM

Re: Re: Accurate 50ppm Crystals
 
Quote:

Originally posted by peranders
If the crystal will be used in a DAC 1000 ppm is good enough and certainly 200 ppm.
No, this prevents narrow pll jitter reduction devices from locking.

peranders 4th June 2008 06:29 PM

... so you want to attach a jitter eater but where. Better than 50 ppm seems very unpractical for one thing.

Cauhtemoc 5th June 2008 06:39 AM

Re: Re: Re: Accurate 50ppm Crystals
 
Quote:

Originally posted by fmak


No, this prevents narrow pll jitter reduction devices from locking.

You are assuming that the incoming signal is exactly 11.2896 MHz, which is rarely the case. It is not uncommon for it to be off by 200 ppm or more.

gmarsh 5th June 2008 03:24 PM

If fmak has a DAC with a VCXO-based PLL, and his CD player clock frequency is outside the pullability of the VCXO, then maybe he's putting a 50ppm crystal in the CDP to get around this.

*shrug*


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