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Old 30th September 2005, 06:19 PM   #1
Sabas is offline Sabas  Spain
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Question Where there are crystals to buy <10ppm

Where there are crystals to buy <10ppm

I live in Spain/Europe and have found this Web that I suppose that she will be of his interest.

https://www.icmfg.com/order_precisioncrystals.html

For frequencies 11.2896 and 16.9344 MHz

Also I am interested in: VCXO, TCXO or OCXO

Thanks
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Old 30th September 2005, 08:19 PM   #2
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I'll guess you shall use the oscillator for digital audio, then the ppm is rather unimportant. You should concentrate your search for low jitter instead.

How much ppm do you actually hear and much jitter do you hear? You can't hear 1000 ppm so paying extra for 10 ppm is a wate of money.
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Old 1st October 2005, 03:12 AM   #3
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Try Crystek crystal oscillators.
<1ps jitter max. over specified!!! range... 5V supply! US$3!

Extreme_Boky
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Old 1st October 2005, 02:00 PM   #4
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Default Crystek crystal oscillators

Any idea where the best place to purchase the Crystek crystal oscillators is, in the required frequencies? Mouser didn't appear to have them in 11.2896 or 16.9344 MHz.

Tom
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Old 1st October 2005, 04:06 PM   #5
Sabas is offline Sabas  Spain
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peranders. Thanks to respond

The crystal is for a clock of cdplayer to synchronize with dac external. The exactitude of the clock derives in a smaller variation of the frequency of the clock and therefore in a smaller error of the data.
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Old 1st October 2005, 04:24 PM   #6
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If you have only one clock source the absolute frequency isn't very important.
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Old 1st October 2005, 11:40 PM   #7
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Default No, no, no, no, no.......

The exactitude has nothing to do with it. You are not going to hear the difference if it is 10 ppm or 1000 ppm.

Only time it will be a problem is when you have a PLL on the RX end, like on SPDIF, and you have a VCXO with a very limited pull range. (As most do.) Then you have to worry. I think the Redbook standard is either 100 or 200 ppm. I could be wrong about the standard, but most VCXOs can handle that amount.

Forget about the damn ppm and concentrate on jitter. How many times do we have to say this?

Jocko
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Old 2nd October 2005, 04:58 AM   #8
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Even if your crystal is specified to +/-1ppm tolerance, it don't mean much once you put in into an oscillator circuit. There, the loading capacitance can push or pull the resultant frequency well off center.

Note, the xtal tolerance is only good at exact loading value. And like Jocko says, Redbook is +/-100ppm, so it's not a big deal. Certainly not a noticeable pitch change.

Manufacturers (hey, I'm one of them) often brag about useless specs. Customers can easily get caught up in a numbers game. It's not always easy to know what counts. For example, the orthognal reflection coefficient of the front panel of my linestage is 0.12 (12% +/-1%, depending on time of day). That's an extremely tight 1%.

jh
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Old 2nd October 2005, 08:37 AM   #9
Sabas is offline Sabas  Spain
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Ok. I will load the crystal with the condenser that specifies the manufacturer and I will be centered in a good power supply and the own circuit of the clock and in the buffer.

Now I have a crystal of 30ppm. I will be based on him to make the clock.
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Old 2nd October 2005, 02:15 PM   #10
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Quote:
Originally posted by Extreme_Boky
Try Crystek crystal oscillators.
<1ps jitter max. over specified!!! range... 5V supply! US$3!

Extreme_Boky

Hi

What frequency components are included in that range ?

best
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