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Old 16th February 2006, 03:46 PM   #1
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Default Audio signal splitter (for preamp)


I need a kind of buffer for the input stage of my preamp. The audio signal is to be splitted in 8-16 equal signals and fed into their own digital volume control chip.

What kind of buffer is a good choise for this application? I have looked at both BUF634 and the OPA134 from Texas Instruments. The preferred choise would be an OPA134 (because of the FET input stage..), but is it powerful enough to feed >8 PGA2310 digital volume controllers? Without too much distortion.

(I am thinking of one singel buffer feeding 8-16 PGA2310, not one buffer/each PGA2310)

Best regards, Kris
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Old 16th February 2006, 08:52 PM   #2
moamps is offline moamps  Croatia
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Join Date: Oct 2002
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The BUF634 is a better choice for driving low impedancies.
Anyway, you can drive 8-10 PGAs (each has a 10k input impedance) with one OPA134 no problem, IMO.

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Old 16th February 2006, 09:38 PM   #3
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I think the OPA134 will do the job very well then... The specifications looks very good
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Old 21st February 2006, 12:25 PM   #4
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i agree go the texas instruments they are a sure bet
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