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Old 13th March 2007, 06:12 PM   #1
Bengali is offline Bengali  United States
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Join Date: Oct 2006
Default digital volume pot ic

Hi,

I'm working with a Maxim 5456 10K digital pot.

Everything is functional however I'm getting major
distortion in the audio.

I'm wiring it in place of a standard pot, H end (input),
Wiper(output), L end to GND. it's between the cd player's
output and a preamp.

any suggestions as to what I may be doing wrong?

thanks
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Old 13th March 2007, 06:21 PM   #2
paulb is offline paulb  Canada
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Join Date: Jun 2001
Location: Calgary
You probably need an op-amp buffer as it shows in the data sheet.
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Old 13th March 2007, 06:35 PM   #3
Bengali is offline Bengali  United States
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Join Date: Oct 2006
thx. guess I will try an op amp next.

do you know why they have the low end tied to Vdd/2, half of Vdd? instead of to Gnd? this wiring is for their headphone amp.
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Old 13th March 2007, 06:58 PM   #4
paulb is offline paulb  Canada
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Location: Calgary
It's because it is a single-supply device and the signal has to be referenced to a point in the middle of the supply voltage so the device can swing above and below it. This is similar to using an op-amp with a single supply voltage: you need a reference voltage somewhere in the middle. You're probably hearing what it sounds like with only the positive swings. clipping everything below 0.
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Old 13th March 2007, 07:01 PM   #5
Bengali is offline Bengali  United States
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Join Date: Oct 2006
ah! makes sense. thanks. will proceed with an op amp.
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