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Old 4th July 2004, 12:48 PM   #1
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Default PCM4104 DAC PCB Layout

Hi...

I've layed out a single sided design for a balanced output PCM4104 4 channel DAC. The idea is to link the A and D gnds via the gnd pins of those 2 caps over the dac chip (u'll see in the design) on the top layer with a strip of copper or summin...

Any comments from the knowledge out there on the layout?

PCM4104 DAC PDF

Thanks
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Old 5th July 2004, 12:21 AM   #2
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Hi there! nice layout.

I can't answer your question but as I have understand it it should work well? I also want to hear from the gurus some tricks with groundplanes.

Your solution is simular to mine, I think?
Picture

/Tobias
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Old 5th July 2004, 05:44 AM   #3
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Ehhm ... I'm right - the both capacitors are directly on the backside of the chip ? where are the legs of them ? I think you haven't enough space for them ...
Hint: you must desolder the DAC to resolder the both capacitors in case of cold solderings (because they must be flat) ...

DGND <-> AGND connecting

If you build two seperate powersupplies (D and A), you maybe could place ~10 Ohm or a coil (or both in parallel) between the two grounds. Don't connect both grounds in the powersupply.

If you design a powersupply for D+A with one ground, connect both grounds of the DAC short as possible and place the ground-connection from the powersupply short as possible to the DAC on the A-side.


Regards

Jobstens
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Old 5th July 2004, 03:00 PM   #4
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Hi...

Quote:
both capacitors are directly on the backside of the chip ? where are the legs of them ? I think you haven't enough space for them ...
well, the dac is on the bottom layer and the 2 caps would be on the top. The red wire in the top layer legend indicates where i'd stick some copper strip, then the 2 gnd legs of those caps would be soldered on both top and bottom (joing the gnd on top) - as long as the bottom is soldered flush to the board the dac should sit happy no?

Speaking of the psu...heres a PDF schem. Nothing to fancy but any comments still be good...

Cheers.
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