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Old 25th July 2012, 05:50 AM   #461
qusp is offline qusp  Australia
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actually it seems there is a problem for some of us that I havent seen mentioned specifically: to use a clock that is high speed enough to do 8x OS + sync mode with ESS and >176/192+kHz we have the NDK crystals in 90.x/98.xMHz. this will allow 8x OS sync mode on these hirez formats, but the same XO will not support the lower speeds like 44.1/48kHz audio. it wont support it because there is no 2048x mode on fifo, so you would have to change clocks.

the only viable option are things like the Silicon labs Si570/571 which will change speeds on the fly as well as being very low jitter.

I guess not many people thought this through, because Ian posted an interest thread for a clock board using these and only a few people replied. to me its the only way forward.

happy to be told i've missed something

Last edited by qusp; 25th July 2012 at 05:59 AM.
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Old 25th July 2012, 06:07 AM   #462
roender is offline roender  Romania
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Silicon labs Si570/571 isn't a solution because is not low phase noise where it matters, at low frequencies. And, more than that, it requires a processor in order to be programed which is another source of noise.
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Old 25th July 2012, 06:22 AM   #463
qusp is offline qusp  Australia
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Quote:
Originally Posted by roender View Post
Silicon labs Si570/571 isn't a solution because is not low phase noise where it matters, at low frequencies. And, more than that, it requires a processor in order to be programed which is another source of noise.
i'm well aware it needs a controller, so does the whole fifo so its hardly an argument. it (and others like it) are the ONLY solution unless you want to change clocks physically, unless Ian enables a 2048x mode. I welcome other solutions, but sorry I pay no attention to those who mention 'issues' without offering an alternative.

I would think the measures of the Si570 already include the noise from the controller, not sure how they could possibly measure it without it's controller …

Last edited by qusp; 25th July 2012 at 06:27 AM.
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Old 25th July 2012, 06:35 AM   #464
roender is offline roender  Romania
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This is the alternative:
http://www.crystek.com/crystal/spec-...k/CCHD-957.pdf
+2048x mode in FIFO

Last edited by roender; 25th July 2012 at 06:37 AM.
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Old 25th July 2012, 06:40 AM   #465
roender is offline roender  Romania
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NDK crystals aren't characterized at low frequencies. There is no datasheet with phase noise vs freq graph
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Old 25th July 2012, 06:44 AM   #466
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If I remember correctly 2048x in FIFO needs additional memory that won't be available in the current format. Possible with multichannel FIFO if Ian has time to develop such a beast while snowed under with orders for the current device

Also, AFAIK, the Si570 only requires controller while switching frequencies, not during 'normal' operation.

EDIT: I may have confused post 783 and 784 from the main thread in coming to the conclusion I have above about 2048x mode.

Last edited by hochopeper; 25th July 2012 at 06:47 AM.
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Old 25th July 2012, 06:48 AM   #467
roender is offline roender  Romania
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Quote:
Originally Posted by hochopeper View Post
Also, AFAIK, the Si570 only requires controller while switching frequencies, not during 'normal' operation.
True! But one should disable the controller itself during normal clock operations.
This can be done, but I have to repeat myself: Si570/571 is't low phase noise at low freq
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Old 25th July 2012, 07:19 AM   #468
hirez69 is offline hirez69  Europe
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Default payment done

#1,2,3,4,5,7,8,10,11,12,18,21,22,23,24,25,26,#27,3 0,31,32,34,35,36 ,38,40,42,43, 45,46,47,48,49,50.

Invoices were sent to your Paypal account email addresses. Please let me know if you don't receive. Got all of the assembled PCBs from SMTA factory. I spent the whole weekend doing the loop test. Everything will be ready for delivery by next week.

Thanks

hirez69
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Old 25th July 2012, 07:29 AM   #469
qusp is offline qusp  Australia
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sorry I had to run out, regretted the wording while I was out. I didnt mean it as stern as read, just gets to me a bit when people pick holes in a solution without providing a viable alternative. do remember due to its nature the PSRR will be very good and the low down phase noise is hardly bad. lets move it to the thread proper anyway rather than here

edit: Roender, the crystek is only available in those frequencies with a large bulk order, not single pieces. i'm already using the 45.1584MHz and as mentioned it would need a change to the fifo.

quad clock board anyone?

Last edited by qusp; 25th July 2012 at 07:37 AM.
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Old 25th July 2012, 07:38 AM   #470
roender is offline roender  Romania
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Quote:
Originally Posted by qusp View Post

edit: Roender, the crystek is only available in those frequencies with a large bulk order, not single pieces. i'm already using the 45.1584MHz and as mentioned it would need a change to the fifo.

quad clock board anyone?
;-)
Crystek CCHD-957 Series Standard Clock Oscillators | Mouser
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