My take to the "Reference" TDA1541A DAC with I2S-BUS architecture

[dvb-projekt]

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.




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

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 Doede´s Input PCB´s.

So here are my new modules:



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.







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

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

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



Best regards to the community,
Oliver

[fastvideo]

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.

[dvb-projekt]

Originally Posted by fastvideo

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.

[dvb-projekt]

Originally Posted by fastvideo

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.

[fastvideo]

Originally Posted by dvb-projekt

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

[fastvideo]

Originally Posted by dvb-projekt

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!!!!!!!!

[dvb-projekt]

Originally Posted by fastvideo

One base board with the external dem-reclock and I2S with indepand supply.
stackable TDA1541A over the base board

So this must be better...

[Bernhard]

Why so long parallel traces for I2S ?
0,1 µ should be closer to the VHC125.

[dvb-projekt]

Changed the cap! Thanks.

[dvb-projekt]

Perhaps it is a good idea to integrate the DEM clock circuit on the Module?