Paralleling up DAC chips - 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 17th July 2004, 03:47 PM   #1
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Default Paralleling up DAC chips

Is this quite a simple thing to do?

Do you just wire up two DAC chips in the same way and then connect the outputs together and reduce the gain in the I/V stage to account for the larger output current?

If this is the case then could I just place another DAC chip on top of the first one? With the SSOP adaptors ive got I think you can just piggy back them on top of each other, so it would be quite simple to add on another chip.

Cheers for any input Matt
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 17th July 2004, 06:12 PM   #2
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Ill just add, is it actually worth it?
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 17th July 2004, 06:52 PM   #3
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
What is the point?

This isn't a flame, just curious...
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 17th July 2004, 07:21 PM   #4
diyAudio Member
 
Join Date: May 2002
Location: Plano , TX
Send a message via AIM to jewilson
I cant see how this is worth doing. Linearly can be affected when the lower order bit from different DAC turn on when at different times. This also can affect the input impedances of the part. One part could current hog on another. Voltage references in the DAC can be affected implementation and degraded. You can end up with more noise and less dynamic range.


__________________
Jim W.
  Reply With Quote
Old 17th July 2004, 07:37 PM   #5
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Konnichiwa,

Quote:
Originally posted by jewilson
I cant see how this is worth doing.

Linearly can be affected when the lower order bit from different DAC turn on when at different times. This also can affect the input impedances of the part. One part could current hog on another. Voltage references in the DAC can be affected implementation and degraded. You can end up with more noise and less dynamic range.
Well, it seems the Engineers at BB/TI do not share your sentiments. Here some notes from their "Theory of operation" section:

"Superior performance and sound quality are produced by
combining the parallel connection of 4 DACs per channel.
This parallel connection technique produces very low THD+N
performance (up to 100dB) and wide dynamic range (up
to 112dB)."

EVM-1702 PCM-1072 EVALUATION MODULE Manual

With all due respect, you seem to have a very limited understanding of converters and how they work, and what important in their design and implementation.

Sayonara
  Reply With Quote
Old 17th July 2004, 07:51 PM   #6
diyAudio Member
 
Join Date: May 2002
Location: Plano , TX
Send a message via AIM to jewilson
Konnichiwa,

If your in to such a dumb concept you should build the thing but use those TDA1541 :

Know you proved it time and time again that your the one with the limited understanding, but I understand. You still have you head in place where the light does not shine.

Sayonara, your self
__________________
Jim W.
  Reply With Quote
Old 17th July 2004, 07:56 PM   #7
diyAudio Member
 
Join Date: Jun 2004
Location: Paris
We have this for computers. Why not for audio !

Click the image to open in full size.
  Reply With Quote
Old 17th July 2004, 08:03 PM   #8
diyAudio Member
 
Join Date: May 2002
Location: Plano , TX
Send a message via AIM to jewilson
stef1777

If that works for you, cool.
__________________
Jim W.
  Reply With Quote
Old 17th July 2004, 08:08 PM   #9
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England

Jim, Thorsten, knock off the personal stuff now please.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 17th July 2004, 08:10 PM   #10
diyAudio Member
 
Join Date: Jun 2004
Location: Paris
Sorry, that's not me. I forgot to place the link.

http://www.dddac.de/ma_dac21.htm

I found this projet very fine. Like an old tube amp... What will apen, if we use 256 chips!!!
  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
Paralleling AMP9 jringels Class D 0 12th February 2007 01:32 PM
Paralleling LM4780 chips? Dominick22 Chip Amps 29 26th February 2006 11:23 PM
paralleling chips odysseybmx414 Chip Amps 15 14th December 2005 07:57 PM
Paralleling Transformers metal Chip Amps 9 9th July 2004 10:02 PM
Any warnings about paralleling chips? Morse Chip Amps 13 29th March 2004 10:28 PM


New To Site? Need Help?

All times are GMT. The time now is 03:26 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