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Old 8th May 2005, 06:10 PM   #1
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Default decoupling caps

I am going to use burr brown drv134 opamps for a project. ti site schematic shows a cap on each voltage input. Both are 1uf no are details are specified about cap. Maybe decoupling caps are on the output stage, which are specified. Anyway i am a beginner and just want to get the correct caps between power supply and op amps.
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Old 8th May 2005, 07:03 PM   #2
dhaen is offline dhaen  Europe
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Decoupling requirements are not set in stone. They depend on layout, supply source impedance and other circuit details. Treat these as other opamps. Have a search of the forum for designs and look at what others have done around their opamps, for ideas.
You also might look at another manufacturer's application notes for a functionally equivalent device.
Analog devices make the SSM2142 which is a drop-in replacement for the DRV134. I consider them interchangeable.

NB AFAIK there are no other equivalents.

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Old 8th May 2005, 09:06 PM   #3
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Default drv 134

I should add that I am using +/-18v to power the op amps. I am just wonering whether caps should be non-polar or polar. Electrolytic or metal film or ?
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Old 8th May 2005, 10:12 PM   #4
dhaen is offline dhaen  Europe
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Caps up to 1uF are small enough and affordable in non-polar types. Above this capacity, it is common to use a polar capacitor with a smaller non-polar cap in parallel.

If you are using several chips on the same board close together, it is usually ok to use one pair of larger polar caps, and a pair of smaller non-polar caps per chip. Mount these as close to the chip supply pins as praciticable. Try to keep a low impedance ground plane.
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Old 8th May 2005, 10:20 PM   #5
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If you're driving a cable, I've had good results with 100uF and 0.1uF per rail. If it's just for a phase splitter driving chip amps, as seems trendy at the moment, then 47uF and 0.1uF should be ok.
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