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Old 5th August 2013, 08:57 PM   #1
ULNOCXO is offline ULNOCXO  Europe
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Default Ultra Low Noise and Low Power Consumption OCXO

Let me introduce myself, I am the representative of a team that in the coming months intends to propose on the market Ultra Low Noise OCXOs tailored for audio purposes.

Two samples was realized for the 90.316800 and 98.304000 MHz frequencies, the test provided the following phase noise figures(dBc/Hz):
90.316800 MHz : -65(@1Hz) -100(@10Hz) -130(@100Hz) -159(@1kHz) -168(@10kHz) -170(@100kHz)
98.304000 MHz : -67(@1Hz) -101(@10Hz) -131(@100Hz) -159(@1kHz) -168(@10kHz) -170(@100kHz)

The other interesting characteristics are:
- 3.3 V Power Supply
- HCMOS Output
- DIL14 Standard Pinout and Size
- Only 50 mA Operating Current
- Less then 190 mA Warmup Current

In attachment you can find the whole preliminary datasheets.

The final price is heavily influenced by the production volumes, this survey is intended to understand if it exists enough interest for this OCXOs to start the production.
If the survey reveals enough interest the target price will be in the range 370.00 to 400.00 Euro per item + Shipment and VAT (21% now) if delivered in a EU country.

If you are interested in these OCXO this is the survey spreadsheet page: https://docs.google.com/spreadsheet/...UE&usp=sharing
If you are looking for different fequencies you can state them in the survey form.

Kind regard
The ULN.OCXO team
Attached Files
File Type: pdf ULNOCXO 045 MHz.pdf (56.7 KB, 104 views)
File Type: pdf ULNOCXO 049 MHz.pdf (56.7 KB, 21 views)
File Type: pdf ULNOCXO 090 MHz.pdf (56.5 KB, 13 views)
File Type: pdf ULNOCXO 098 MHz.pdf (56.5 KB, 28 views)
File Type: pdf ULNOCXO 100 MHz.pdf (56.5 KB, 38 views)

Last edited by ULNOCXO; 8th August 2013 at 08:37 PM.
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Old 19th November 2013, 09:25 PM   #2
ULNOCXO is offline ULNOCXO  Europe
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Default Datasheets update

The 12kHz to 20MHz rms Jitter has been recalculated with the JitterTime Calculator, the rev. 0.1 is available in attachment.
Attached Files
File Type: pdf ULNOCXO 045 MHz - Rev 0.1 .pdf (110.9 KB, 31 views)
File Type: pdf ULNOCXO 049 MHz - Rev 0.1 .pdf (110.9 KB, 11 views)
File Type: pdf ULNOCXO 090 MHz - Rev 0.1 .pdf (110.9 KB, 8 views)
File Type: pdf ULNOCXO 098 MHz - Rev 0.1 .pdf (110.8 KB, 13 views)
File Type: pdf ULNOCXO 100 MHz - Rev 0.1 .pdf (110.8 KB, 31 views)
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Old 26th January 2014, 12:41 PM   #3
Bunpei is offline Bunpei  Japan
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First, I should express my sincere gratitude to ULNOCXO those who offered me a valuable opportunity to test a pair of ULNOCXOs.

Before trying ULNOCXOs, I had just tested NDK NZ2520SA prototype samples of 90.316800 MHz and 98.304000 MHz by replacing NDK NZ2520SD regular products of 45.1584 MHz and 49.152 MHz on Chiaki's Dual Mono ES9018 DAC (The DAC module is coupled with SDTrans384 SD memory transport in a synchronous master clocking scheme).
In general, when we use a crystal oscillator device of high-frequency as a master clock source for ES9018 DAC, we should accept a certain trade-off. For instance, the higher frequency we use for seeking a better resolution of ES9018 output, the worse phase noise property of master clock we should accept.
When I compared NDK 90s MHz ones with NDK 40s MHz ones, I realized the trade-off. The 90s MHz oscillators brought a higher resolution, at the same time it accompanied a feeling of something too sharp or harsh.

I changed NDK 90s MHz ones with ULNOCXO 90s MHz ones. The adverse results I recognized in selecting higher frequencies disappeared! The ULNOCXOs improved all the aspect of resulting sounds, such as resolution/separation, timbres, a nature of bass, staging in 3D, fast response of percussion and moreover they brought a joy of listening music to me.

I thought those ULNOCXOs were quite "preiswert" ( a German word) even if one piece costed approximately 500 Euro. I would not hesitate to purchase one if it were sold now.
However, we should remember that the best performance of the OCXO must be obtained only when we prepare a high quality power supply and a DAC module commensurate with the OCXOs.
One more important thing. The best OCXO performance does not directly mean the best performance of the total systems. Some expensive systems in a professional domain may demonstrate far better sounds and music without employing such OCXOs.

Last edited by Bunpei; 26th January 2014 at 12:46 PM.
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Old 28th January 2014, 02:36 PM   #4
Bunpei is offline Bunpei  Japan
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This picture shows the ULNOCXO is set on the DAC board. The OCXO is located near to a small NDK NZ2520SA 90s MHz oscillator chip.
Attached Images
File Type: jpg ULNOCXO.JPG (132.0 KB, 546 views)
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Old 30th January 2014, 02:35 PM   #5
Bunpei is offline Bunpei  Japan
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As for a DC +3.3V power supply I used a modified TI TPS7A4700 evaluation board(Ceramic capacitors on the board were replaced with multiple types of film capacitors based on my experiences). A big CDE 100 uF film capacitor is connected in the middle of the power line for decoupling though it does not appear in the photo. At the power input pin of the oscillator, I located/ does not locate/ an additional 47 uF Sanyo OS CON for a further decoupling.
I observed a maximum draw just after an initial power on was approximately 200 mA and it decreased gradually as time went and a stable draw after one minutes was approximately 50 mA.
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Old 24th February 2014, 10:23 PM   #6
modmix is offline modmix  Germany
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Hi ULN.OCXO team,
beginning of this year I learned about the benefits of OCXOs - currently 10 MHz feeding a Mutec MC-3+. I now would like to change the 12.288 MHz clock in my DEQX crossover. Any chance?
TIA
Ulli
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Old 26th February 2014, 09:46 AM   #7
ULNOCXO is offline ULNOCXO  Europe
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Quote:
Originally Posted by modmix View Post
Hi ULN.OCXO team,
beginning of this year I learned about the benefits of OCXOs - currently 10 MHz feeding a Mutec MC-3+. I now would like to change the 12.288 MHz clock in my DEQX crossover. Any chance?
TIA
Ulli
Hi modmix,
Even if presently we are mainly involved with the higher frequencies the production of the OCXO for lower frequencies is just a matter of numbers, with a reasonable interest we can start the production.
I suggest you to sign up your request into our survey page so we can trace the requests and to inform you when the OCXO will be available, just report the desired frequency/ies in the "Notes" column.
For you convenience I report again here the survey page link:
https://docs.google.com/spreadsheet/...WVzVfZUE#gid=0
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Old 26th February 2014, 06:59 PM   #8
Gradius is offline Gradius  Chile
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Excuse me for this, but... wouldn't getting an used Rubidium, and then building a very good clock converter/transformer be better and somewhat (for what it is and does) cheaper?

The Rubidium wouldn't be included, just the converter/transformer circuit.

I'm after 22.5792MHz, 24.576MHz and 100MHz frequencies.
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Old 26th February 2014, 07:48 PM   #9
jcx is offline jcx  United States
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OCXO, or especially Rubidium address non-problems in audio reproduction - long term drift/absolute accuracy aren't real human audio perceptual problems

OCXO can control some close in phase noise - but there's no psychoacoustic evidence or signal theory support for the need for much lower phase noise at offsets a tiny fraction of the smallest perceptual critical band size of ~100 Hz

Last edited by jcx; 26th February 2014 at 07:51 PM.
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Old 26th February 2014, 07:55 PM   #10
TNT is offline TNT  Sweden
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My take is that the sideband of the XO has direct hz for hz influence on the audio reproduction frequency range. I bother about sub 100 hz in my system. So I aim för -120 dbc at 20 hz.

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