Grounding for a DAC PCB

[cedus]

Hi everybody,

I am currently making an I2S DAC PCB based on TI's 1794. The schematic is almost done and I am thinking of making the PCB but that is my first digital work.

Can anyone give me interesting readings to do and/or links to study how to design PCB for digital equipment. I have search on the archive but they are no really precise answers on the subject.

I am particularly worried of the Grounding, especially how to link digital and analog ground. In one sentence what is the best way. Can I use a single layer or do I have to use dual layer PCB.

Thank you for your help

 

[gfiandy]

Hi,

In one sentence; Link digital and analogue ground underneath the DAC and use a two layer PCB with as much ground fill as possible on both the top and bottom layers.

Ok so its quite a long sentence.

Also don't allow digital tracks to go over analogue ground or visa versa.

This site is an excellent refernace for High speed digital design. However alot of this stuff is quite difficult to understand.

http://www.sigcon.com/pubsIndex.htm

Regards,
Andrew

 

[Guido Tent]

Hi everybody,

I am currently making an I2S DAC PCB based on TI's 1794. The schematic is almost done and I am thinking of making the PCB but that is my first digital work.

Can anyone give me interesting readings to do and/or links to study how to design PCB for digital equipment. I have search on the archive but they are no really precise answers on the subject.

I am particularly worried of the Grounding, especially how to link digital and analog ground. In one sentence what is the best way. Can I use a single layer or do I have to use dual layer PCB.

Thank you for your help

Hi,

At least use 2 layers, use one as a groundplane and keep that closed. I have some practical recomendations in my article on my site:

http://www.tentlabs.com/InfoSupport/Technology/page35/files/Supply_decoupling.pdf

best

Guido