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Old 10th May 2008, 07:13 AM   #1
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Default Powering a PGA2310

Hi, I'm new to the forum...I'm working on a preamp based around the TI PGA2310 attenuator chip and I need some help with picking out a transformer that will supply sufficient current to power the chip. I have a +/- 15 volt regulator schematic already and I just need the xformer. How much power does the PGA require? My LM317/337's can't supply more than 1.5 amps each so I know I need that much or less from a transformer. Is an amp per rail sufficient? I'm trying to keep my preamp in a 2 inch tall box and I need to use the smallest transformer possible (and toroidal ones are really expensive for the specs I want).

Any suggestions?

Thanks!

-Dan
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Old 10th May 2008, 07:22 AM   #2
peufeu is offline peufeu  France
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Read the datasheet

A very small transformer will probably be sufficient.
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Old 10th May 2008, 08:41 AM   #3
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+ 100mA would be over kill for that chip. It's idle current isn't even 15mA.
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Old 10th May 2008, 09:16 AM   #4
peufeu is offline peufeu  France
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Yeah the power LED will draw more current than the PGA2310, lol.
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Old 13th May 2008, 02:49 PM   #5
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Thanks a lot guys. I looked through the datasheet a few times and I didn't see anything like those numbers (except the idle current) but it's probably in there somewhere...

Awesome. This will save me some $$$

-Dan
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Old 13th May 2008, 03:07 PM   #6
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Dan,

I have some small dual secondary transformers that would be suitable. They are Zettler Magnetics 44215. You can find them on this page.

You can have a few of them for just the cost of shipping.
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