Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 205 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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 January 2013, 12:13 PM   #2041
RollE2k is offline RollE2k  Sweden
diyAudio Member
 
Join Date: Nov 2007
Yes, the Buff clock is 100MHz CCHD-950.
But then reading the newer DualXO double rate manual it seems as FIFO+XO-board with 45.1584/49.1520 MHz crystals in sync mode seems to be the way to go (since then i would cover all the way from 44.1/48 to 352/384). I'll have to read more about this.
So the reason Buff uses 100MHz clock, must be to cover all samplerates in Async mode, for flexibility that is.

Last edited by RollE2k; 11th January 2013 at 12:35 PM.
  Reply With Quote
Old 11th January 2013, 12:26 PM   #2042
roender is offline roender  Romania
diyAudio Member
 
roender's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by RollE2k View Post
So the reason Buff uses 100MHz clock, must be to cover all samplerates in Async mode, for flexibility that is.
Exactly! In syc mode there is no need for such high frequency clock.
  Reply With Quote
Old 11th January 2013, 12:35 PM   #2043
RollE2k is offline RollE2k  Sweden
diyAudio Member
 
Join Date: Nov 2007
So then for me who will use alot of sample-rates and both SPDIF/I2S the best way to use this would be to have my Amanero and a SPDIF->I2S board, connect through a 2:1 switch like Twisted pear OTTO-2, and then into the FIFO, through the XO-board to my DAC.

Last edited by RollE2k; 11th January 2013 at 12:41 PM.
  Reply With Quote
Old 11th January 2013, 12:38 PM   #2044
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
Actually the datasheet recommends >192*FS for OSF Normal mode. (NB greater than and NOT equal to/greater than).

So 45/49 is only good up to 192kHz.

This is at least part of the reason why Ian has gone to great effort for the Si570 as a way of providing the faster clock frequencies!

Chris

Last edited by hochopeper; 11th January 2013 at 12:45 PM.
  Reply With Quote
Old 11th January 2013, 12:40 PM   #2045
roender is offline roender  Romania
diyAudio Member
 
roender's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by hochopeper View Post
Actually the datasheet recommends >192*FS for OSF Normal mode. (NB greater than and NOT equal to/greater than).

So 45/49 is only good up to 192kHz.

This is at least part of the reason why Ian has gone to great effort for the Si570 as a way of providing the faster clock frequencies!
The OSF is off in Sync mode
  Reply With Quote
Old 11th January 2013, 12:41 PM   #2046
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
Quote:
Originally Posted by RollE2k View Post
So then for me who will use alot fo sample-rates and both SPDIF/I2S the best way to use this would be to have my Amanero and a SPDIF->I2S board, connect through a 2:1 switch like Twisted pear OTTO-2, and then into the FIFO, through the XO-board to my DAC.

Actually Ian's Spdif->i2s board has an i2s 'back door' that means you can provide your i2s from amanero through this i2s input on the spdif board and cycle through inputs on that board without any drama of having extra multiplexor boards. Unless you have more than one i2s input? Check the zip file for Ian's spdif manual for instructions.



Chris
  Reply With Quote
Old 11th January 2013, 12:45 PM   #2047
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
Quote:
Originally Posted by roender View Post
The OSF is off in Sync mode
This is a common misconception. The OSF and synchronous clocking are two separate issues.


Chris
  Reply With Quote
Old 11th January 2013, 12:51 PM   #2048
roender is offline roender  Romania
diyAudio Member
 
roender's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by hochopeper View Post
This is a common misconception. The OSF and synchronous clocking are two separate issues.
Then how do you explain that I'm able to play PCM 384Khz FS with my BIII connected synchronous with SDtrans384?
I have an dual clock board made by myself based on CCHD957 45.1584 MHz and 49.152 MHz placed on BIII DAC. The clock selection is made remotely by SDtrans

Last edited by roender; 11th January 2013 at 12:54 PM.
  Reply With Quote
Old 11th January 2013, 12:59 PM   #2049
RollE2k is offline RollE2k  Sweden
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by hochopeper View Post
Actually Ian's Spdif->i2s board has an i2s 'back door' that means you can provide your i2s from amanero through this i2s input on the spdif board and cycle through inputs on that board without any drama of having extra multiplexor boards. Unless you have more than one i2s input? Check the zip file for Ian's spdif manual for instructions.

Chris
This would be the best way to run it, but the problem for me is that i probably won't have enough room in my case (DAC will be together with my tube-linestage, w. AMB R-2R volume, input selector, PSU's and everything), so ian's SPDIF board will not fit the case, if it was smaller (like if the outputs were removed, and connectors were offboard) then it would work. I'll probably have to go for TP-4:1 MUX together with OTTO-2. If there isn't any other good alternatives out there.

Robert
  Reply With Quote
Old 11th January 2013, 01:24 PM   #2050
diyAudio Member
 
Join Date: Feb 2009
Location: Brisbane, Australia
Quote:
Originally Posted by roender View Post
Then how do you explain that I'm able to play PCM 384Khz FS with my BIII connected synchronous with SDtrans384?
I have an dual clock board made by myself based on CCHD957 45.1584 MHz and 49.152 MHz placed on BIII DAC. The clock selection is made remotely by SDtrans
ES9012/8 OSF is ON unless explicitly set to OFF by the DAC controller, refer to page 17 of the datasheet.

The datasheet clock recommendations are just that, recommendations for optimal performance, just because they work doesn't mean that the DAC chip is going to perform at its best. Ian has commented (see quote below) in his Si570 reviews earlier that there is differences between 44.1kHz at 45.1584MHz vs 90.xxxxMHz. He would not at the time comment which was his preference, just that they were subjectively different.


Quote:
Originally Posted by iancanada View Post

4. Another discovery is, ESS9081 sounds different for a same 44.1 KHz stream with different MCLK frequencies, for example 45.1584MHz and 90.3168MHz. Hard to tell which one is better, but the sound style is a bit different indeed. I know itís the internal up-sampling digital filter, different performance for different MCLK.
Cheers,
Chris
  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
XMOS-based Asynchronous USB to I2S interface Lorien Digital Source 2111 12th July 2014 05:21 AM
exaU2I - Multi-Channel Asynchronous USB to I2S Interface exa065 exaDevices 1357 3rd March 2014 08:51 PM
DAC chip selection + I2S jitter questions drwho9437 Digital Line Level 2 26th July 2010 12:50 PM
Simple FIFO to I2S CPLD, for MCU players / reclocking KOON3876 Digital Line Level 21 19th September 2008 04:00 PM
asynchronous reclocking and low jitter clocks ash_dac Digital Source 3 8th February 2005 09:22 AM


New To Site? Need Help?

All times are GMT. The time now is 07:55 AM.


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