"Reference" TDA1541A DAC with I2S-BUS architecture - Page 41 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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
View Poll Results: Surface Finish for future PCBs
ENIG - Electroless Nickle/Immersion Gold 59 47.20%
Immersion Silver 36 28.80%
Immersion Tin 18 14.40%
OSP - Organic Solderability Preservatives 12 9.60%
Voters: 125. You may not vote on this poll

Reply
 
Thread Tools Search this Thread
Old 14th December 2010, 03:38 AM   #401
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 39
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by savvas View Post
Does M2Tech Evo need this ?
As far as i could see it...

Click the image to open in full size.

...it has a buffer behind the I2S connector.
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 14th December 2010, 06:33 AM   #402
diyAudio Member
 
Join Date: Oct 2007
Location: Cologne
Malka07 - 1x
studiostevus - 1x
Crusty - 1x
kamaths - 1x
av-trouvaille - 1x
ernesternest - 1x
  Reply With Quote
Old 14th December 2010, 07:00 AM   #403
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Could someone please advise me as to what value resistor to place across the output of the +5 volt regulator to simulate the Optivol load so that I can set the voltage before connecting up the LDR's. TIA.
Marra
  Reply With Quote
Old 14th December 2010, 07:12 AM   #404
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 39
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by Marra View Post
Could someone please advise me as to what value resistor to place across the output of the +5 volt regulator to simulate the Optivol load so that I can set the voltage before connecting up the LDR's. TIA.
Marra
See reply in OVC thread!
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 14th December 2010, 08:01 AM   #405
diyAudio Member
 
Join Date: Nov 2007
Location: Scotland
So what's the science behind that? What do R28 and R31 do?

No science, no 'scope, just a bit of luck. DD's module didn't work with Oliver's board so I looked at the input circuitry as that's where Oliver's design differs from others. Somewhere on the threads there's a discussion on this but I can't find it right now.

By-passing R3 in the FS line and R5 in the data line was easy to do but made no difference so I put them back. However, removing the pull up R28 and the pull-down R31 in the BCK line got the circuit working so (this is the clever bit) I left them out. There are probably better solutions but for now it's working.

I'm still wondering what a high-speed buffer is for. Folk who've ordered one presumably know what they want it for: if it's a better solution to this problem than the one I've come up with (i.e. I'm missing the point), I'd like to know . . .

HTH
  Reply With Quote
Old 14th December 2010, 01:15 PM   #406
savvas is offline savvas  Greece
diyAudio Member
 
Join Date: Mar 2004
Location: Salonica
Quote:
Originally Posted by dvb-projekt View Post
As far as i could see it...

...it has a buffer behind the I2S connector.

That IC9 chip I guess


Quote:
Originally Posted by Ryelands View Post

I'm still wondering what a high-speed buffer is for. Folk who've ordered one presumably know what they want it for: if it's a better solution to this problem than the one I've come up with (i.e. I'm missing the point), I'd like to know . . .

HTH
Propagation delay, I guess, all things equal almost 3 times lower of 74HC family
  Reply With Quote
Old 14th December 2010, 03:20 PM   #407
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 39
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by Ryelands View Post
I'm still wondering what a high-speed buffer is for.
Steve Nugent of Empirical Audio wrote a large article in the POSITIVE FEEDBACK ONLINE - ISSUE 43
about "Jitter in Digital Audio Data Streams".

I hope this answer your question.

Quote:
Logic buffering

The digital audio data must make its way through the system over wires/traces and sometimes through buffers,
such as the buffer to drive the S/PDIF cable.
Each of these buffers has finite reaction times and imprecise detection of changing signal levels.
What this means is that even though the signal may not have much jitter coming into the buffer,
it may exit with additional jitter.
This jitter is a result of the speed of the device, thermal effects on the silicon die,
power delivery on the die and even transmission-line effects.

The WM8804 and other I2S converter typical supply voltage equals 3.3V.
The I2S attenuators from ecdesigns i am using on my DAC module, are designed for 5V TTL levels only.
So we need the buffer between the output of these 3.3V devices and the input of my DAC module
for a proper work, without canceling the advantages of the I2S attenuators.
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 16th December 2010, 11:58 PM   #408
noizas is offline noizas  Lithuania
diyAudio Member
 
Join Date: May 2009
Location: Vilnius, Lithuania
Hi Oliver

Malka07 - 1x
studiostevus - 1x
Crusty - 1x
kamaths - 1x
av-trouvaille - 1x
ernesternest - 1x
noizas - 2x
  Reply With Quote
Old 18th December 2010, 02:30 AM   #409
diyAudio Member
 
Join Date: Aug 2008
Default buffer boards

Quote:
Originally Posted by dvb-projekt View Post
Steve Nugent of Empirical Audio wrote a large article in the POSITIVE FEEDBACK ONLINE - ISSUE 43
about "Jitter in Digital Audio Data Streams".

I hope this answer your question.




The WM8804 and other I2S converter typical supply voltage equals 3.3V.
The I2S attenuators from ecdesigns i am using on my DAC module, are designed for 5V TTL levels only.
So we need the buffer between the output of these 3.3V devices and the input of my DAC module
for a proper work, without canceling the advantages of the I2S attenuators.

Oliver

From you description an some reading of the article above, where should we put the buffer module actually??? Is it to every digital output such as I2S or spdf from signal source or digital input of a dac ?
  Reply With Quote
Old 18th December 2010, 06:22 AM   #410
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 39
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by gabanyayaya View Post
Oliver

From you description an some reading of the article above, where should we put the buffer module actually??? Is it to every digital output such as I2S or spdf from signal source or digital input of a dac ?
The buffer is only needed at the I2S line converter output, if it has no buffer onboard.

I2S Converter --> Buffer --> DAC Module

Data --> Buffer input - Buffer output --> Data DAC module
LRCLK --> Buffer input - Buffer output --> FS DAC module
BCK --> Buffer input - Buffer output --> BCK DAC module
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  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
i2s bus vs. i2c bus Doovieman Digital Source 9 5th February 2013 02:08 PM
My take to the "Reference" TDA1541A DAC with I2S-BUS architecture dvb projekt Digital Line Level 130 30th January 2011 01:54 PM
what is "ground bus"? gychang Parts 4 12th November 2007 09:21 PM
PCM2707 I2S out to TDA1541A DAC TV Man Digital Source 3 4th December 2004 05:53 PM
A real DAC Philips TDA1541A "Double Crown"? dbhh Digital Source 17 7th May 2004 05:15 AM


New To Site? Need Help?

All times are GMT. The time now is 07:59 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