decoupling caps

argonrepublic · 8th May 2005, 06:10 PM

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.
Thanks

dhaen · 8th May 2005, 07:03 PM

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.
SSM2142

NB AFAIK there are no other equivalents.

Thread moved to Electronics and Parts for bigger a audience

argonrepublic · 8th May 2005, 09:06 PM

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 ?

dhaen · 8th May 2005, 10:12 PM

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.

pinkmouse · 8th May 2005, 10:20 PM

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.

8th May 2005, 06:10 PM	#1
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	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. Thanks

8th May 2005, 09:06 PM	#3
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	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 ?

8th May 2005, 10:20 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	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. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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8th May 2005, 07:03 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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. SSM2142 NB AFAIK there are no other equivalents. Thread moved to Electronics and Parts for bigger a audience

8th May 2005, 10:12 PM	#4
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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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