New XMOS usb 384khz - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th April 2013, 03:25 PM   #1
diyAudio Member
 
Join Date: Feb 2013
Default New XMOS usb 384khz

Anybody here buy ? Any good ?

Xmos 384kHz High Quality USB to I2S PCB with Ultralow Noise 6 5UV Regulator | eBay
__________________
  Reply With Quote
Old 12th April 2013, 02:46 AM   #2
diyAudio Member
 
Join Date: Jul 2003
I was thinking the same thing, or maybe this one,
Isolated 24bit 192kHz USB to I2S SPDIF CM6631A PCB for ES9018 AK4399 PCM1794 | eBay
  Reply With Quote
Old 12th April 2013, 06:46 AM   #3
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
First one is a basic double sided PCB, basic routing, nothing special. Second one cant see any details because of the white solder resist everywhere, but looks slightly better.
Marketing the same for both.
For best quality I would expect at least a 4 layer board...To put it into perspective I have just done a little camera board for a car reversing camera, 10 layers, every signal layer internal and surrounded by ground planes top and bottom.
  Reply With Quote
Old 12th April 2013, 06:54 AM   #4
diyAudio Member
 
Join Date: Feb 2013
XMOS better than CM on jitter ? Or is XO most important factor ? or both...
__________________
  Reply With Quote
Old 12th April 2013, 10:29 AM   #5
Account disabled at member's request
 
Join Date: Sep 2007
Location: Multiple...
Quote:
Originally Posted by Nanoloop View Post
XMOS better than CM on jitter ? Or is XO most important factor ? or both...
With asynchronous re-clocking done at 48.0000MHz you can figure out the differences: 45.1584MHz vs. 48.0000MHz and 49.1520MHz vs. 48.0000MHz.
  Reply With Quote
Old 12th April 2013, 12:18 PM   #6
rsowen is offline rsowen  United Kingdom
diyAudio Member
 
Join Date: Apr 2013
Location: Bristol, UK
Quote:
Originally Posted by RayCtech View Post
With asynchronous re-clocking done at 48.0000MHz you can figure out the differences: 45.1584MHz vs. 48.0000MHz and 49.1520MHz vs. 48.0000MHz.
The master clock doesn't get touched by the XMOS chip.

His advert is a bit misleading I would say. The XMOS chips adds NO jitter to the master clock, its asynchronous.
  Reply With Quote
Old 12th April 2013, 02:53 PM   #7
diyAudio Member
 
Join Date: Feb 2013
MCLK output = 24.5 and 22.5 MHz for both.

CM has two xo, so xo is always integer of mclk. Good !

XMOS XO is 48Mhz and it is not integer of mclk. Maybe CM can be better on this but maybe XMOS is better for other factor, for example, firmware, driver, etc.

I know CM is very good but I don't know XMOS.
__________________

Last edited by Nanoloop; 12th April 2013 at 02:56 PM.
  Reply With Quote
Old 12th April 2013, 03:09 PM   #8
rsowen is offline rsowen  United Kingdom
diyAudio Member
 
Join Date: Apr 2013
Location: Bristol, UK
Quote:
Originally Posted by Nanoloop View Post
MCLK output = 24.5 and 22.5 MHz for both.

CM has two xo, so xo is always integer of mclk. Good !

XMOS XO is 48Mhz and it is not integer of mclk. Maybe CM can be better on this but maybe XMOS is better for other factor, for example, firmware, driver, etc.

I know CM is very good but I don't know XMOS.

Both chips need a clock to run on (CM looks to be 12MHz, XMOS with be 12, 24, 48 etc) this will be a USB rate multiplier.

Assuming Async operation, this has nothing to do with the master clock. Both chips will take two clock inputs for async mode (one for 44.1.. and one for 48...)
  Reply With Quote
Old 12th April 2013, 03:15 PM   #9
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
xmos has huge amounts of jitter on BLCK/SDATA/LRCK, we are talking about >ns range and this board makes no attempt to clean it up. as es9018 uses its own mclk normally, the incoming blck jitter can have significant effects. I would go with the CM if I had to chose between the 2

why does he always put decoupling caps so far away?

Quote:
4) No Via in active circuit (via inductance always create jitter problem)
hmm I would be interested to see how longer non impedance controlled and yes..inductive traces compare to the inductance caused by directly connecting with a micro via.
pure marketing.

Last edited by qusp; 12th April 2013 at 03:22 PM.
  Reply With Quote
Old 12th April 2013, 03:56 PM   #10
diyAudio Member
 
Join Date: Feb 2013
Quote:
Originally Posted by rsowen View Post
CM looks to be 12MHz
Most CM use 3 xo - 12, 45 and 49. I see 2 xo on the XMOS. They are Fox Xpresso so no number. What freq ?

All XMOS are bad for jitter ? I can't believe this.
__________________
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
USB to I2S 384Khz - DSD Converter amanero Vendor's Bazaar 2028 Today 09:53 AM
FS: Amanero USB to I2S 384Khz - DSD Converter MrMajestic Swap Meet 3 10th April 2013 10:38 AM
FS: Amanero USB to I2S 384kHz DSD converter board ultrafi Swap Meet 4 20th February 2013 10:36 PM
XMOS Async USB interface (UAC 2.0) dwk123 Swap Meet 1 16th August 2011 04:01 AM
FS: XMOS USB interface/dac ultrafi Swap Meet 2 27th May 2011 07:32 PM


New To Site? Need Help?

All times are GMT. The time now is 07:37 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2