Accurate 50ppm Crystals

fmak · 4th June 2008, 07:17 AM

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

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

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

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*

4th June 2008, 07:17 AM	#1
fmak diyAudio Member Join Date: May 2001 Location: London UK	Accurate 50ppm Crystals Can someone please point to a source of at least 50ppm 11.2896 crstals? Not XOs. Ideally in UK

4th June 2008, 06:29 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	... so you want to attach a jitter eater but where. Better than 50 ppm seems very unpractical for one thing. __________________ /Per-Anders (my first name) or P-A as my friends call me

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4th June 2008, 11:56 AM	#2
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	Digikey UK (uk.digikey.com), part number 300-8429-ND. 30ppm.

5th June 2008, 03:24 PM	#7
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	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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