ezDAC v.1.5 Builders Thread - Page 9 - 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 4th December 2009, 12:24 PM   #81
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Hi Louis,

The digital inputs of the ezDAC are nothing fancy, just three BNC's for coaxial S/P-dif input that can be switched to the ezDAC PCB with three miniature relays. It all passive.

USB input is a nice feature, but if you have a module that outputs I2S, then you can bypass the CS8416 and send the I2S straight to the ASRC chip. It's a bit of a detour to let the USB module convert I2S to S/P-dif, and two inches further down the path have the ezDAC's CS8416 do the exact opposite. You would need to switch the three I2S signal lines then, but with the proper relay, that shouldn't be a problem.

Regards,

Ray

Regards,

Ray
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 7th December 2009, 03:54 AM   #82
TICUL38 is offline TICUL38  Canada
diyAudio Member
 
Join Date: Jun 2005
Location: Ste-Therese, Quebec
Thanks Ray, your response sent me to do some research.
You raise a good point re the double conversion when using a ready made USB-S/PDIF converter.
So far I interpret the need to use a USB receiver that provides the I2S outputs (such as using the PCM2706), with the I2S then connected directly to the ASRC (AD1896) would subsequently be subjected to the up-sampling and re-clocking process? ... am I off on this?
A consequent thought comes to mind; while operating with the USB to I2S conversion going directly to the ASRC chip, would it be necessary to disarm (kill) all connections to and from the CS8416 receiver chip (power and interconnects to the ASRC)? ... this could become a major task re-routing of bus connections!
Also, what about the interdependency between the CS8416 and AD1896....does the re-clocking circuit need the CS8416 to be powered up and interconnected?
Your help is much appreciated!
... and glad to learn you have expanded the family.
I have 10 grandchildren that search me out when they visit... still enjoy them at 71.
Regards,
__________________
All those "bits" give me indigestion!
  Reply With Quote
Old 7th December 2009, 03:59 PM   #83
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Here she is:
Attached Images
File Type: jpg Mara_01.jpg (120.7 KB, 264 views)
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  Reply With Quote
Old 7th December 2009, 04:13 PM   #84
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
One of the best DIY-jobs so far

The ASRC and receiver chip work independent of each other. The incoming data from the CS8416 is just received by the ASRC, not 'clocked'. The 8416's PLL does lock on the clock that's present in the S/P-dif signal, but the ASRC doesn't need it. The 8416 only acts as a S/P-dif to I2S converter. The resampled data is clocked out of the ASRC by the 24.5MHz on-board clock. Any I2S data that you provide at it's inputs will be resampled.

You have to disconnect the three I2S line between the two chips if you want to connect another I2S source. This can be done by simply removing the three 100R resistors. Power can stay on. I tried it with a Marantz CD72 and connected the ASRC directly to the SAA7310 decoder: works perfectly. If you use a rotary switch with three center contacts, you can connect multiple sources if you like (don't forget to insert the 100R resistors). Only thing you have to be aware of is that the ezDAC ASRC is 3.3V logic. If you connect a source-chip that runs on 5V, you need a simple voltage divider in each line to reduce the voltage.

Regards,

Ray
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!

Last edited by 6h5c; 7th December 2009 at 04:18 PM.
  Reply With Quote
Old 7th December 2009, 07:55 PM   #85
Hurtig is offline Hurtig  Denmark
diyAudio Member
 
Join Date: Feb 2005
Location: Denmark - Århus
Quote:
Originally Posted by 6h5c View Post
Here she is:
Great result of 5 min of DIY construction
Congrats!! You have every reason to be proud.
  Reply With Quote
Old 7th December 2009, 08:01 PM   #86
TICUL38 is offline TICUL38  Canada
diyAudio Member
 
Join Date: Jun 2005
Location: Ste-Therese, Quebec
Default ezDAC

Quote:
Originally Posted by 6h5c View Post
One of the best DIY-jobs so far
Good work! ...your performance was by EVIDENCE "heavenly"!

... and now the ezDAC:
good info, thank you! ... now have a pretty good feeling for what I will try to implement.
The plan is to work all chips at same 3.3V level, but from separate supplies with a common power transformer. The panel input selector will power-feed break-before-make relays that complete short parallel wire runs from alternate (3) I2S sources to the resistor set at the CS8416. Will likely be including the optical S/P DIF input option as contingency.
Will be posting as I progress during the next few months... takes me that much time, but hey I am retired and no longer chasing rabbits!
Will peek in periodically to see if any progress with you or other builders.
Regards,
__________________
All those "bits" give me indigestion!
  Reply With Quote
Old 7th December 2009, 11:45 PM   #87
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
Quote:
Originally Posted by 6h5c View Post
...if you have a module that outputs I2S, then you can bypass the CS8416 and send the I2S straight to the ASRC chip. It's a bit of a detour to let the USB module convert I2S to S/P-dif, and two inches further down the path have the ezDAC's CS8416 do the exact opposite. ...
It is a bit inelegant, but do you think there's any actual degradation going through the SPDIF conversion? I know I2S is intended for very short (inter-chip) paths, and I'm reluctant to bring it out to a rotary switch (or a relay).
But assuming one were to go direct, any suggestions for a USB-to-I2S chip?
  Reply With Quote
Old 8th December 2009, 12:39 AM   #88
TICUL38 is offline TICUL38  Canada
diyAudio Member
 
Join Date: Jun 2005
Location: Ste-Therese, Quebec
Default USB receiver/I2S output

I have the same concern re loss of "bit/timing fidelity" when reconverting a USB input to S/P DIF (via a I2S step) and back to I2S...
Maybe the multi-sampling/re-clocking function at the AD1896 chip would smooth out such added "jitters" and bit losses?
The PCM2706 receiver chip would provide the I2S outputs.
The PCM 2704 would strictly provide the S/P DIF signal as used by the HagUSB adapter ( Hagerman Technology LLC: HagUsb USB to SPDIF Audiophile Converter )

Regards,
Louis
__________________
All those "bits" give me indigestion!
  Reply With Quote
Old 8th December 2009, 03:24 AM   #89
TICUL38 is offline TICUL38  Canada
diyAudio Member
 
Join Date: Jun 2005
Location: Ste-Therese, Quebec
Default USB to I2S conversion

I came across this one page diyAudio thread:

Please Explain direct to I2S USB DAC

Post #4 appears flawed by insinuating that the clocking and I2S cannot be disjoined when receiving USB with PCM 27** chips. The I2S information is output by the PCM2706. Would this not be the case... the I2S can be used as is by the re-clocking taking place at the AD1896 chip?

Regards
__________________
All those "bits" give me indigestion!
  Reply With Quote
Old 8th December 2009, 01:41 PM   #90
6h5c is offline 6h5c  Netherlands
One Seriously Addicted to Audio and Electronics
diyAudio Member
 
6h5c's Avatar
 
Join Date: Apr 2004
Location: Heerhugowaard
Quote:
Originally Posted by Hurtig View Post
Great result of 5 min of DIY construction
Congrats!! You have every reason to be proud.
Quote:
Originally Posted by TICUL38 View Post
Good work! ...your performance was by EVIDENCE "heavenly"!
Thanks guys! I'm a Very Proud New Dad! But also a bit tired... late night diapers, you know

Ray
__________________
Gonna buy my little girl a pink soldering-iron
The new DOS-CFP board is out!
  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
F3 Builders Thread Melon Head Pass Labs 523 31st May 2014 03:05 PM
EZDAC is singing now!!! ezkcdude Digital Source 217 11th December 2011 06:45 PM
A-X IP Issues (split from Builders thread) tomchaoda Pass Labs 107 16th October 2011 02:05 AM
ezDAC chipsets xaudiox Group Buys 0 27th May 2009 06:45 PM


New To Site? Need Help?

All times are GMT. The time now is 03:49 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