Delta Sigma Modulator by MarcelvdG

[PJotr25]

Hi all,

I made a separate PCB for the Delta Sigma Modulator by MarcelvdG shown in the
https://www.diyaudio.com/community/threads/valve-dac-from-linear-audio-volume-13.308860/

Thanks to Marcel for this project.

It is intended for Trenz TE0630 LX45 and LX75 FPGA modules.
This module is easy to program via USB and the Trenz application:
https://wiki.trenz-electronic.de/pages/viewpage.action?pageId=10620253
This module must be configured by shorting R102 pads on the FPGA board.

Actual LX45 configuration file see:
https://www.diyaudio.com/community/...r-audio-volume-13.308860/page-76#post-6569767

Actual LX75 configuration file see:
https://linearaudio.net/sites/linearaudio.net/files/additionaldatavalveDACversion2p1.zip

The FPGA code contains a sigma-delta modulator that has three modes selectable by switches.
Similarly, we can choose a filter.
You can read a lot of information about this modulator in the document:
https://linearaudio.net/sites/linearaudio.net/files/03 Didden LA V13 mvdg.pdf

Additionally, I included some information in the schematic.

This version has only I2S input/output.

I put schematic, boom and gerber files.

 

[merlin el mago]

What's a DSD FPGA DAC?

 

[Markw4]

Why the choice of an 8Mhz standard clock?

 

[MarcelvdG]

Typo for 27 MHz?