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Old 21st May 2006, 03:24 PM   #1
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Default PSU suggestions for my DAC

I've been working on a very simple DAC design. Nothing original, but it's my first. I've gotten it to the point where I need to figure out how to generate the various voltages (3.3, 5, +/-12 V). I would prefer not to deal directly with mains voltage (fear of electrocution), so I'm thinking of using an external supply. I'm just not sure whether it would be best to use AC, DC, single or multiple outputs? Any suggestions/advice would be much appreciated.
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Old 21st May 2006, 03:33 PM   #2
phn is offline phn  Sweden
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Get a toroid, 12-0-12V. Will give you just under +/-17V.

Then get 3.3, 5 and 12 V regulators. You will need diodes and filter caps as well.

You will need more info than that. But that, and a schematic, is basically what you have deal with.
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Old 21st May 2006, 04:11 PM   #3
infinia is offline infinia  United States
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Not sure what level you are coming from but after reviewing your schematic, bottom one with differntial op-amp connections.
Some Tips

Digital to analog split is very important to get the most performance. Use a spilt ground plans thru DAC IC correct.

1) 3V on digital side only, and seperate 5V, +/- 12V on analog side only.
As phn noted can use 3 terminal regs but with seperate grounds.
Look for lower noise and ripple 3 terminal regs for analog side.

2) Connection between analog and digital supplies ground at a single point ground system.
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Old 21st May 2006, 04:25 PM   #4
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Thanks, guys. Infinia, I wouldn't have known to connect those 50 ohm to DGND. So, thanks, for suggesting this.

Edit: After I wrote this, you removed that suggestion. What happened?
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Old 21st May 2006, 04:29 PM   #5
infinia is offline infinia  United States
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My mistake, sorry I thought the DAC IC didn't have a seperate split internal. I edited my post after realized the error.
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Old 21st May 2006, 04:34 PM   #6
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Oops! I'll keep this in mind for the future, though.
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Old 22nd May 2006, 01:38 PM   #7
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For now, since this is my first project, I may go with a open frame PSU, such as this one from Power One , which has +5, +12/15, and -12/15.
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Old 28th May 2006, 05:24 PM   #8
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Default Update

I've drawn up the regulation schematics, which uses LM317/37 for +3.3/5.0/+/-12 (see pg. 5). Any suggestions/corrections are appreciated, as always. I should note that these schematics are taken directly from the data sheets and "Art of Electronics".
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Old 28th May 2006, 05:27 PM   #9
poobah is offline poobah  United States
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wrong attachment ez...
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Old 28th May 2006, 05:37 PM   #10
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It's the right one. Please see the last page (5). Thanx.
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