decoupling caps - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th May 2005, 06:10 PM   #1
diyAudio Member
 
Join Date: Apr 2005
Location: Simcoe Ont
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.
Thanks
  Reply With Quote
Old 8th May 2005, 07:03 PM   #2
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
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
  Reply With Quote
Old 8th May 2005, 09:06 PM   #3
diyAudio Member
 
Join Date: Apr 2005
Location: Simcoe Ont
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 ?
  Reply With Quote
Old 8th May 2005, 10:12 PM   #4
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
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.
  Reply With Quote
Old 8th May 2005, 10:20 PM   #5
diyAudio Moderator
 
pinkmouse's Avatar
 
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.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
tda1541 decoupling caps weegs Digital Line Level 8 7th December 2013 05:59 PM
HF Decoupling Caps questions Tyimo Tubes / Valves 2 23rd November 2008 02:37 PM
Caps for digital decoupling?? imperfectcircle Digital Source 5 28th July 2006 05:39 PM
Best decoupling caps for TDA1541 D.A.R.R.Y.L. Digital Source 5 27th April 2006 04:28 PM
Decoupling caps(again) argonrepublic Parts 2 10th May 2005 10:32 PM


New To Site? Need Help?

All times are GMT. The time now is 08:21 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2