My take to the "Reference" TDA1541A DAC with I2S-BUS architecture - diyAudio
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Old 24th January 2010, 09:28 AM   #1
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Default My take to the "Reference" TDA1541A DAC with I2S-BUS architecture

After the finalizing of my 4x TDA1541A DAC, i thought there is still potential to upgrade especially in the PSU section.

Unfortunately not with a ready build PCB. So i decide to make a new DAC project with this main goals:

- Modular architecture to get max. flexibility
- DAC cascadable
- Compl. I2S-BUS architecture


In the modular design i see the main advatage. Every stage could be build upon the requirements:

- Input section
- DAC section
- Output section
- PS section
- Regulator section


This idea is surely not new. Doede Douma made a perfect modular system with his DDDAC 1543 MKII on his side.

He had the same goals but build his DAC only around the TDA1543.

His Input section with a separate USB to I2S PCB and SPDIF to I2S PCB, both with precise TentLab low jitter clocks, are superb.

So i only must think about a new TDA1541A, PSU & Regulator PCB to integrate it in his environment as shown in the next picture.

Click the image to open in full size.


I designed a new PCB for the TDA1541a, cascadable for two, four, eight ore more DACs.

The Power Supply is also strict modular with a +/- PS-Board and two Regulator Boards with Salas great Shunt design.
One only for the TDA1541a and the other for the Buffer-IC on the DAC-Board and add. Digital Modules like Doedes Input PCBs.

So here are my new modules:

Click the image to open in full size.

As you could see, the Buffer-IC is completely independent from the DAC power lines!
So you could use a separate regulator for it if you want.


Click the image to open in full size.

Click the image to open in full size.


For the Output-Stage i will connect my Tube-I-zator PCB, but everything else is surely possible.

After days of drawing the new PCBs, i must relax a bit before the next step begins, the production of the PCBs.

Many thanks to Doede Douma for his brilliant concept and to Salas for his outstanding regulator design.



Best regards to the community,
Oliver
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Old 24th January 2010, 04:25 PM   #2
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This is what I am looking for.
TDA1541 module should be able to stack to 2X, 4X or 8X........
External Dem-clock fit into Pin16 and 17 of this modular design will be perfect.
I have 10 TDA1541A sitting here for this project.
The PCB layout underneath of the TDA1541A should be improve, please check with the layout from those manufacturers as a reference.

Last edited by fastvideo; 24th January 2010 at 04:46 PM.
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Old 24th January 2010, 04:45 PM   #3
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Quote:
Originally Posted by fastvideo View Post
This is what I am looking for.
TDA1541 module should be able to stack to 2X, 4X or 8X........
If the external Dem-clock Pin16 and 17 can fit into this modular design will be perfect.
That would be no problem. I have a little space to insert a connector for that.
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Old 24th January 2010, 04:50 PM   #4
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Quote:
Originally Posted by fastvideo View Post
The PCB layout underneath of the TDA1541A should be improve, please check with the layout from those manufacturers as a reference.
I have forgot to say that all boards become a ground plane on the upper side of the 2-layer design.

So there is a optimal shield between the upper (blue) and base (red) layer.
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Old 24th January 2010, 05:00 PM   #5
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Quote:
Originally Posted by dvb-projekt View Post
That would be no problem. I have a little space to insert a connector for that.
One base board with the external dem-reclock and I2S with indepand supply.
stackable TDA1541A over the base board
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Old 24th January 2010, 05:06 PM   #6
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Quote:
Originally Posted by dvb-projekt View Post
I have forgot to say that all boards become a ground plane on the upper side of the 2-layer design.

So there is a optimal shield between the upper (blue) and base (red) layer.
Believe me, there must be a reason that all manufacturer's TDA1541A layout looks almost the same. Stick with it!!!!!!!!

Last edited by fastvideo; 24th January 2010 at 05:14 PM.
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Old 24th January 2010, 05:34 PM   #7
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Quote:
Originally Posted by fastvideo View Post
One base board with the external dem-reclock and I2S with indepand supply.
stackable TDA1541A over the base board
So this must be better...
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Old 25th January 2010, 12:25 AM   #8
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Why so long parallel traces for I2S ?
0,1 should be closer to the VHC125.
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Old 25th January 2010, 05:14 AM   #9
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Changed the cap! Thanks.
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Old 25th January 2010, 04:02 PM   #10
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Perhaps it is a good idea to integrate the DEM clock circuit on the Module?
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