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Old 26th October 2008, 10:47 AM   #11
00940 is offline 00940  Belgium
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muckrake: a clock costs 25 (30 with vat) at tentlabs. Not a bad deal for a audio specialty shop. And you don't have to buy 100.

209 (vat included) is for a fully stuffed secondary pll PCB, which is way harder to design, includes a low noise power supply and so on.
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Old 26th October 2008, 11:09 AM   #12
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Quote:
Originally posted by 00940
muckrake: a clock costs 25 (30 with vat) at tentlabs. Not a bad deal for a audio specialty shop. And you don't have to buy 100.

209 (vat included) is for a fully stuffed secondary pll PCB, which is way harder to design, includes a low noise power supply and so on.

Hi Ben

You take the words right out of my mouth

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Old 27th October 2008, 03:22 AM   #13
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Quote:
Originally posted by 00940
includes a low noise power supply and so on.
I'd bet my life that the manufacturer used nothing more than a cheap opamp based regulator to get those numbers.
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Old 27th October 2008, 04:32 PM   #14
00940 is offline 00940  Belgium
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Quote:
Originally posted by muckrake
I'd bet my life that the manufacturer used nothing more than a cheap opamp based regulator to get those numbers.
Well, if a cheap opamp based regulator is all that's needed to get such numbers, there is no reason to use something more expensive. Don't you agree ?

Btw, why don't everyone use such regs if they guarantee such high performance while being cheap ? Would it be that they're not that trivial to design and implement properly ? And with this PCB from Tentlabs, you're also paying for guaranteed performances, that's not diy anymore. Give 200 to an average diyer and see how many will design a proper PLL and PS.

In any case, I don't think an opamp based regulator is used in the Tent XO-Dac. I only see one dip8 package and it's most probably used for something else (just by looking at the published schematic of a DAC to which Guido Tent contributed and that also includes a secondary PLL).

So.. do you have a gun next to you ?
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Old 27th October 2008, 07:27 PM   #15
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Quote:
Originally posted by muckrake

I'd bet my life that the manufacturer used nothing more than a cheap opamp based regulator to get those numbers.
Wrong bet

And you could have known that, as no opamp based regs exist that achieve noise a slow as 3nV/SqrrtHz
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Old 27th October 2008, 09:02 PM   #16
excelon is offline excelon  Europe
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Question PLL synth. and VCXOs

  Interesting thread... I do have one ideea to use CDCL6010L as PLL synth./jitter cleaner feeded by one of many VCXOs/VCOs out there. I guess I'll use Crysteks (e.g. CVHD-950) so, let's ignore for now the interface problem...
I read in the datasheet that CDCL6010L is a preety good chip though I, somehow, "feel" (read know) that if I'll use after VCXO it will raise the jitter level at outputs. From theory, it's this a true statement or the jitter still remain in "acceptable" limits (<= 5ps)?
&nbsp;&nbsp;kind regards!
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Old 28th October 2008, 06:44 AM   #17
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Quote:
Originally posted by Guido Tent


Wrong bet

And you could have known that, as no opamp based regs exist that achieve noise a slow as 3nV/SqrrtHz
Maybe Jocko's:
http://www.diyhifi.org/forums/viewto...t=1570&start=0

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Old 28th October 2008, 07:54 PM   #18
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CDCL6010 is not bad for a chip, but it uses CML logic and is a QFN package. Seems like a lot of work...
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Old 28th October 2008, 11:56 PM   #19
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Don't know how relevant this is but I saw this somewhere:

http://www.rme-audio.com/english/tec...teadyclock.htm
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Old 29th October 2008, 08:35 AM   #20
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Quote:
Originally posted by 454Casull
Don't know how relevant this is but I saw this somewhere:

http://www.rme-audio.com/english/tec...teadyclock.htm
When they still express jitter in ns: Forget about it

See for a serious product here

http://www.grimmaudio.com/grimm%20cc1%20leaflet.pdf

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