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Old 10th November 2011, 12:06 AM   #161
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Quote:
Originally Posted by GOR3 View Post
Ian,
I think you tried the Crystek CCHD-957. What were your impressions?
BR,
George
I just get the back order from Digikey last week. I'm have to make an adapter. I'll let you know once I get the result. Any way, the specification was impressed .

Ian
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Old 10th November 2011, 12:51 AM   #162
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Quote:
Originally Posted by qusp View Post
are C4 and C9 some sort of capacitor network? they appear to have 4 terminations
Very glad you noticed that. It's NFM filter from Murate. Somebody call it three terminal capacitor. Very good noise suppression performance. Much better than the normal decoupling capacitors due to its smart construction( 20dB in difference at 20MHz, and 40dB at 100Mhz). Highly recommended for clock power supply. You can find more details from http://www.murata.com/products/catalog/pdf/c31e.pdf
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File Type: jpg NFM.JPG (47.4 KB, 1852 views)

Last edited by iancanada; 10th November 2011 at 12:57 AM.
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Old 11th November 2011, 11:35 PM   #163
qusp is offline qusp  Australia
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Originally Posted by iancanada View Post
Hi qusp,

Thanks again for the recommendation of the U.FL connectors. I'm very happy with them. It get the signal improved obviously. I use both U.FL conncetors and cables in almost all of my projects now.
no problem at all, indeed they are very useful. i can fit the w.fl on the u.fl pad so can use directly without an adapter which is cool.

Quote:
Very glad you want the KIT. Once I go through the fully test on all the second edition PCBs and make sure everything is OK with bug free, I will consider setting up a group buy. I could figure out how much work I have to do going a small quantity production. Don't warry about your wallet, I'll give you a surprise .
sweet

Quote:
Originally Posted by iancanada View Post
Very glad you noticed that. It's NFM filter from Murate. Somebody call it three terminal capacitor. Very good noise suppression performance. Much better than the normal decoupling capacitors due to its smart construction( 20dB in difference at 20MHz, and 40dB at 100Mhz). Highly recommended for clock power supply. You can find more details from http://www.murata.com/products/catalog/pdf/c31e.pdf
well thats really interesting!! quite apt too, because i was actually just thinking about how i might get rid of the HF out of band fundamental in 'the wire' switching psu just for completeness.

I think i might ad a few to my DK order to have a play; thanks for that.
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Old 30th November 2011, 01:19 AM   #164
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Default SPDIF Driver and digital transformer selection

SPDIF driver and the digital transformer are very significant for a SDPIF FIFO because they will introduce additive jitter after secondary clock.

To reduce that additive jitter, I use a 3GHz balanced LVPECL flip-flop, MC100EP31 as the SPDIF driver and re-clock logic.

I did the listening test by making use of PCM-7040 as a DAC, which was the top of the line broadcast grade DAT flagship from SONY and it's very sensitive to the SPDIF input, each different driver and transformer could be heard. Obviously, with the same set up, LVPECL driver sounds better than the traditional 74HCU04 CMOS driver.

Three SPDIF transformers were tested. They are Pulse PE65612, Newava S22083 and Newava S22160. Each of them sounds slightly different. The PE61612 is good, S22083 bit better. But the one I love the most is the S22160, which comes with more liquid and more musical.

I attached the driver schematics and the SPDIF signal waveform (after 5 feet coaxial cable with 75 ohm termination) for reference.

This test is still undergoing, I will try some other kinds of low jitter SPDIF driver and will select the best one to use finally.
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File Type: jpg LVPECLDRIVER5Fcable.JPG (80.2 KB, 1599 views)
File Type: jpg PCM7040.JPG (832.9 KB, 1534 views)
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File Type: pdf LVPECLDRIVERSCH.pdf (8.2 KB, 209 views)
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Old 30th November 2011, 06:48 PM   #165
GOR3 is offline GOR3  United States
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Ian,
Your findings with respect to the different transformers are interesting. In looking at the data sheets for each, it appears that the Pulse 65612 and the Newava 22083 are toroids (I am guessing from the fact that they are potted), but your favorite, the Newava 22160 is an open frame architecture. [Unless I am reading the data sheet incorrectly (certainly possible), the Pulse 65612 has an inductance of 2500 H (listed as “2.5mH”), whereas the other two transformers have an inductance of 225 H -- around a magnitude difference. Typo on data sheet?]
BR,
George

Last edited by GOR3; 30th November 2011 at 06:53 PM. Reason: correct typo
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Old 30th November 2011, 11:51 PM   #166
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I have some PE65612 and measured them recently - the 2.5mH primary inductance figure is most certainly not a typo. As a result of its higher primary inductance, the leakage inductance is also higher.
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Old 1st December 2011, 06:29 PM   #167
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Quote:
Originally Posted by GOR3 View Post
Ian,
Your findings with respect to the different transformers are interesting. In looking at the data sheets for each, it appears that the Pulse 65612 and the Newava 22083 are toroids (I am guessing from the fact that they are potted), but your favorite, the Newava 22160 is an open frame architecture. [Unless I am reading the data sheet incorrectly (certainly possible), the Pulse 65612 has an inductance of 2500 H (listed as 2.5mH), whereas the other two transformers have an inductance of 225 H -- around a magnitude difference. Typo on data sheet?]
BR,
George
Yes, from the specifications, they are. And, another thing I noticed, PE-65612 use double-wire for each coil, but S22160 use single wire (with bit bigger).

Quote:
Originally Posted by abraxalito View Post
I have some PE65612 and measured them recently - the 2.5mH primary inductance figure is most certainly not a typo. As a result of its higher primary inductance, the leakage inductance is also higher.
In many applications, PE-65612 has been quite standarded digital audio transformer .
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Old 5th December 2011, 12:17 AM   #168
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Default Crystek CCHD-957 low phase noise oscillator and the adapter

Crystek CCHD-957 family oscillators were designed especially for high definition audio applications. From the specification, they have pretty impressed low phase noise performance.

I got the backorder from Digikey two weeks ago. It took me two month! But both Digikey and Mouser keep in stock now.

Of course you can solder it directly to a 14 pin IC socket by wires, but I think making an adapter would be much better. I got the adapter PCB today. The assembling is easy. First, I solder the CCHD-957 on the top of the PCB, then, flip it over, solder a 1n, a 104 and a 1u bypass capacitors on the back. And then, plug in four IC pins into the corner positions of a 14 pin IC socket and fit them into the four holes from the back of the adapter PCB. The last step is soldering the four pins to the pads at back. Now, with the adapter, CCHD-957 could be used as a standard 4 PIN DIP XO at anywhere.

I put both 22.5792 MHz and 24.5760 MHz CCHD-957 oscillators with adapter hookup into my double XO FIFO clock board. It looks nice. I caught cold yesterday and lost some listening sensitivity. I will do some comparison test on them once Im getting better.
Attached Images
File Type: jpg CCHD957.JPG (326.4 KB, 1226 views)
File Type: jpg CCHD957AdapterPCB.JPG (334.0 KB, 1133 views)
File Type: jpg CCHD957withAdapter.JPG (307.8 KB, 525 views)
File Type: jpg DoubleXOBoard957Hookup.JPG (339.6 KB, 493 views)
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Old 7th December 2011, 04:51 PM   #169
qusp is offline qusp  Australia
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looking good as always Ian, if i were to need an adapter for a clock, i would want it to look like yours =) is there any reason why you didnt use FFC/FPC all round for the ribbon type connections rather than a mix of regular crimped larger pitch ribbon and FFC/FPC? which brand did you use, hirose? any facility for shielded?

perhaps to allow more legacy type support for older dac modules you have? as they look to be in parallel to the u.fl so i guess that would make sense

Last edited by qusp; 7th December 2011 at 04:55 PM.
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Old 7th December 2011, 05:11 PM   #170
gvelim is offline gvelim  United Kingdom
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Originally Posted by iancanada View Post
Yes, from the specifications, they are. And, another thing I noticed, PE-65612 use double-wire for each coil, but S22160 use single wire (with bit bigger).
It appears the reason is the fast rise/fall times.
Am I Experienced?: PE65612 vs. S22083/S22160

However the blogger recommends sc944-05 as a better replacement, here is the product page
http://amiexp.blogspot.com/2011/08/sc944-05.html

Re: Crystek CCHD-957, I am using it with PO74G04A and the sound is great.

Opening the new DacMagic????

According to those graphs again is the fast rise/fall time that makes the difference.
Am I Experienced?: DSIX with PO74G04

Last edited by gvelim; 7th December 2011 at 05:32 PM.
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