An idea! Fully balanced TDA1541A DAC idea. Please comment!

cartman · 16th July 2007, 06:26 PM

Hi Guys!

I have an idea to make a fully balanced TDA1541A DAC.

It could works?

Thx!

Tazzz · 16th July 2007, 06:43 PM

Yes it would work but you would not get the really cool benefits of running it balanced.

So use this instead:

http://www.pedjarogic.com/1541a/I2Sbal_split.htm

cartman · 16th July 2007, 07:15 PM

Thanks Tazz for the comment...

...but I really don't see why better the Pedja's method?

Maybe the channel separation is better, but at my idea, the RCA and XLR outputs are simply to operate.

What do you think?
Why isn't good this method than Pedja's?

cartman · 16th July 2007, 07:19 PM

Perhaps the phase inverter would be more simple than i2s splitter...

Tazzz · 16th July 2007, 08:15 PM

You could read the threads about how to decouple the tda1541a lots of pointers there.

For one thing running one dac differential would make the complimentary audiocurrents flowing trough Va+ constant, wich would be most desireable.

Bricolo · 16th July 2007, 10:00 PM

the way the 1541 is built, the AC current going to the supply pin is the same as the current in both outputs

so if you have a classical L/R implementation, it's just 2 separate channels

on the other hand, if you have L+/L-, the AC supply current becomes (L-)+(L+) so L-L=0
you get only (or almost) a DC supply current to the chip, making the regulation, decoupling, PSSR, problems almost disappear

X.G. · 17th July 2007, 01:47 AM

the best way is to make a glue logic for working in sim' mode of TDA1541, like this by CPLD:

http://www.cdream5.com/htm/blance_dac1541A.htm
http://www.cdream5.com/htm/I2S_MK.htm

abzug · 17th July 2007, 04:25 AM

I have always wondered, why not use sign magnitude loading with dual dac like TDA?

Bricolo · 17th July 2007, 09:18 AM

Quote:

Originally posted by X.G.
the best way is to make a glue logic for working in sim' mode of TDA1541, like this by CPLD:

http://www.cdream5.com/htm/blance_dac1541A.htm
http://www.cdream5.com/htm/I2S_MK.htm

why is it better?

16th July 2007, 10:00 PM	#6
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	the way the 1541 is built, the AC current going to the supply pin is the same as the current in both outputs so if you have a classical L/R implementation, it's just 2 separate channels on the other hand, if you have L+/L-, the AC supply current becomes (L-)+(L+) so L-L=0 you get only (or almost) a DC supply current to the chip, making the regulation, decoupling, PSSR, problems almost disappear __________________ Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease

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16th July 2007, 06:43 PM	#2
Tazzz diyAudio Member Join Date: Jun 2007	Yes it would work but you would not get the really cool benefits of running it balanced. So use this instead: http://www.pedjarogic.com/1541a/I2Sbal_split.htm

16th July 2007, 07:19 PM	#4
cartman diyAudio Member Join Date: May 2005 Location: Europe	Perhaps the phase inverter would be more simple than i2s splitter...

16th July 2007, 08:15 PM	#5
Tazzz diyAudio Member Join Date: Jun 2007	You could read the threads about how to decouple the tda1541a lots of pointers there. For one thing running one dac differential would make the complimentary audiocurrents flowing trough Va+ constant, wich would be most desireable.

17th July 2007, 01:47 AM	#7
X.G. diyAudio Member Join Date: Sep 2003 Location: GuangDong China	the best way is to make a glue logic for working in sim' mode of TDA1541, like this by CPLD: http://www.cdream5.com/htm/blance_dac1541A.htm http://www.cdream5.com/htm/I2S_MK.htm

17th July 2007, 04:25 AM	#8
abzug Account Disabled Join Date: Jan 2006 Location: whereisit	I have always wondered, why not use sign magnitude loading with dual dac like TDA?

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