Hi,
It looks like Digi-key will have the Crystek soonish (17 October) - US$30.
Oscillators | Digi-Key
I use Farnell here in HK so I've emailed them asking for stock. I'll try the 22.5792 so I can compare it to the other clocks I have.
It looks like Digi-key will have the Crystek soonish (17 October) - US$30.
Oscillators | Digi-Key
I use Farnell here in HK so I've emailed them asking for stock. I'll try the 22.5792 so I can compare it to the other clocks I have.
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Hi,
I've been trying to get some info from Crystek about basic psu specs to achieve the 170dB noise floor - noise level and bandwidth and the xo's own ripple rejection. Unfortunately, they won't tell me, they just tell me stuff like "lowest possible" and "look at the datasheet".
Does anyone have any idea ? Can any local US citizen contact them about this ?
Thanks for any help. I've pre-ordered a couple to try and they are supposed to ship today.
I've been trying to get some info from Crystek about basic psu specs to achieve the 170dB noise floor - noise level and bandwidth and the xo's own ripple rejection. Unfortunately, they won't tell me, they just tell me stuff like "lowest possible" and "look at the datasheet".
Does anyone have any idea ? Can any local US citizen contact them about this ?
Thanks for any help. I've pre-ordered a couple to try and they are supposed to ship today.
In Japanese DIY digital audio community, SMD type oscillator made by NDK is becoming very popular. Though this component does not directly meet your requirement, DIP 14pin type, two people in Japan made their efforts as these two pictures show;
"Ken" on his blog page;
"atsukita" is an expert of replacing parts;
An externally hosted image should be here but it was not working when we last tested it.
The second problem is its long lead time, 1.5 - 3 month.
--------------------------------------------------------
CMOS output Crystal Clock Oscillator NZ2520SD
manufactured by a Japanese leading crystal maker, Nihon Dempa Kogyo Co., Ltd.
NZ2520SD(OA / AV)/Crystal Clock Oscillators/NDK
Part number for +3.3V power version are;
NZ2520SD-22.579200M-NSA3449B
NZ2520SD-24.576000M-NSA3449B
The model has a remarkable low phase noise profile. According to their measurement result sheet, Phase Noise [dBc/Hz] 26MHz 3.3V for 5 samples
1Hz: max -76, min -81
10Hz: max -108, min -111
100Hz: max -136, min -138
1kHz: max -151, min -152
10kHz: max -156, min -157
The component is available for personal users by way of a Japanese online web store, chip1stop.
?????????????? - ????????? | ???? (In Japanese, You can switch to English and Dollar currency page.)
The price I bought was 1,500 JPY / piece ( 20 USD/ piece ) and 1,000 JPY/10 piece.
thanks for that Info
I like to buy 1 pcs of NDK XO at 11.2896
are there others wanting to buy xo at 11.2896 MHz to meet 10 pcs discount
Crystek clocks arrived today, but still no word from Crystek themselves - shockingly poor customer service.
Size comparisons:
Mounted to a dip 14 socket using ofc wire :
22Mhz burning in.... powr is from 2 x 317 configured as a pre-tracking reg + reg, then an adp150 3.3V reg with Nichicon LE 860uF ultra low esr caps.
Size comparisons:
An externally hosted image should be here but it was not working when we last tested it.
Mounted to a dip 14 socket using ofc wire :
An externally hosted image should be here but it was not working when we last tested it.
22Mhz burning in.... powr is from 2 x 317 configured as a pre-tracking reg + reg, then an adp150 3.3V reg with Nichicon LE 860uF ultra low esr caps.
An externally hosted image should be here but it was not working when we last tested it.
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Got mine...
CCHD-957s are now mounted up in my SOtM Async USB receiver. Even cold out of the box these made for a really nice improvement: more liquid, decays hold on longer into a blacker pool, transients are better refined, while listening ease is greater with a removal of a glassy quality on some transients I had not realized was there-until it was gone...
Nice!
CCHD-957s are now mounted up in my SOtM Async USB receiver. Even cold out of the box these made for a really nice improvement: more liquid, decays hold on longer into a blacker pool, transients are better refined, while listening ease is greater with a removal of a glassy quality on some transients I had not realized was there-until it was gone...
Nice!
+1
The 22Mhz is a very clear upgrade from the Vanguard 1ppm. Much more definition. And they cost about the same.
I don't know if they need time to settle in, so I gave it a day anyway, before doing any listening.
So thanks for the heads up on this clock ! I hope thy do an 11.2896 and 12.000 at some point.
The 22Mhz is a very clear upgrade from the Vanguard 1ppm. Much more definition. And they cost about the same.
I don't know if they need time to settle in, so I gave it a day anyway, before doing any listening.
So thanks for the heads up on this clock ! I hope thy do an 11.2896 and 12.000 at some point.
You can use a 74ch163N to halve the 22 to 11. It'll add about 6db noise but that isn't such an issue as it still means a very very low noise floor. Most important is the clock gets an ultra low noise supply.
http://www.nxp.com/documents/data_sheet/74HC_HCT163_CNV.pdf
But yeah, I'd love them if they released 11.2896 and 12.000. In the meantime, there are Vanguard 0.3ppm and Tent labs so no big deal.
http://www.nxp.com/documents/data_sheet/74HC_HCT163_CNV.pdf
But yeah, I'd love them if they released 11.2896 and 12.000. In the meantime, there are Vanguard 0.3ppm and Tent labs so no big deal.
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25ps doesn't seem that special tbh... and datasheets... well... the Euroquartz xo91 claims "Phase Jitter RMS: <1ps typical" and yeah, it sounds good but not that good; note they don't give the bandwidth. It is a cheap smd part but you could say it is excellent value. The Crystek claim fs, not ps, rms jitter and over a wide bandwidth too.
http://www.euroquartz.co.uk/Portals/0/xo91.pdf
http://www.euroquartz.co.uk/Portals/0/xo91.pdf
Did you see how the "others" calculate the jitter compared with the fox datasheet? Anybody can claim 1ps, but properly calculating and advertising the resulting jitter takes some level or proffesionalism.
Phase jitter of Foxcon is below 1ps RMS if you don't care about other "details".
Phase jitter of Foxcon is below 1ps RMS if you don't care about other "details".
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The digital
engineers I trust, who I have corresponded with, all agree that phase noise is the important specification for oscillator performance in audio. Especially phase noise at low frequencies (<=10 Hz). so comparing the phase noise plots should get the best information.
By this spec, the NDKs recommended by Bunpei, and the Crystek CCHD Series both look good.
Do not that phase noise varies somewhat by frequency as well, when comparing the phase noise plots published by Crystek.
engineers I trust, who I have corresponded with, all agree that phase noise is the important specification for oscillator performance in audio. Especially phase noise at low frequencies (<=10 Hz). so comparing the phase noise plots should get the best information.
By this spec, the NDKs recommended by Bunpei, and the Crystek CCHD Series both look good.
Do not that phase noise varies somewhat by frequency as well, when comparing the phase noise plots published by Crystek.
And then there's power.... unless there's some major magic going on, dirty power is going to increase jitter.... and no company I have emailed will tell me the specs of their bench test supplies.
So I try them and trust my ears. So far cchd957 is best, a no-brand ocxo is next, then Vanguard 0.3ppm and Tent Labs joint third....and all of these are really excellent. I have quite a few brands of 1ppm dip14 tcxo's that are quite good and the xo91 is almost as good as the worst of them.
I haven't tried any of the Fox parts and I still want to try the Audiocomm superclock, but the price is a bit high. I'm hoping someone has compared these to the Tent or something I know .... anyone ?
So I try them and trust my ears. So far cchd957 is best, a no-brand ocxo is next, then Vanguard 0.3ppm and Tent Labs joint third....and all of these are really excellent. I have quite a few brands of 1ppm dip14 tcxo's that are quite good and the xo91 is almost as good as the worst of them.
I haven't tried any of the Fox parts and I still want to try the Audiocomm superclock, but the price is a bit high. I'm hoping someone has compared these to the Tent or something I know .... anyone ?
No question
That power supply is critical. I am sure Crysteks specified measurements are made with very low noise supplies, in an isolated lab setting.
For us, an isolated, low noise supply, with very low output impedance (to keep clock frequencies from modulated the supplies) is needed to get the best performance out of any oscillator.
That power supply is critical. I am sure Crysteks specified measurements are made with very low noise supplies, in an isolated lab setting.
For us, an isolated, low noise supply, with very low output impedance (to keep clock frequencies from modulated the supplies) is needed to get the best performance out of any oscillator.
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