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Old 30th August 2002, 10:58 PM   #1
ALW is offline ALW  United Kingdom
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Default Question for op-amp guru's

I'm looking for an op-amp to replace a TL074 in an active filter application. Any suggestions for quad packages as a drop-in replacement for an existing product?

I haven't really decided on target performance yet, but lower noise JFET types are the immediate goal.

I've had a quick scan through the parametric searches, but would love any other advice from those who've tried alternatives.

A.
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Old 31st August 2002, 12:18 AM   #2
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...would generaly avoid quads....try duals eg NE5532.....
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Old 31st August 2002, 01:09 AM   #3
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You want a drop in replacement so the 5532 is not a contender.

How about the OPA4134?
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Old 31st August 2002, 03:04 AM   #4
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I second Bill's suggestion for the OPA4134 - the OPA4132 would work just as well, with better DC precision (less offset, among other things), but if I remember correct, the DIP versions have been discontinued (only the 14-SOIC package is available currently)
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Old 31st August 2002, 05:21 AM   #5
johnny1 is offline johnny1  Greece
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Bill is right. You won't find anything better with four op amps in the same case.
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Old 31st August 2002, 07:30 AM   #6
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LT1362:

http://www.linear-tech.com/prod/data...l?datasheet=81

LT1365:

http://www.linear-tech.com/pub/q_src...uct_family=All

opa42228:

http://www-s.ti.com/sc/ds/opa2228.pdf
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Old 31st August 2002, 08:07 AM   #7
Nisbeth is offline Nisbeth  Denmark
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The OPA4132/4 are discontinued in the DIP-14 package. The OPA 4228 should work well instead.

/U.
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Old 31st August 2002, 09:14 AM   #8
ALW is offline ALW  United Kingdom
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Default Big thanks

Mikek,

I'd normally avoid quads too, but no choice in this case, I need drop-in replacement.

Thanks to everyone else, I'll download data sheets and investigate further, will let you know the outcome. Thanks for taking the time to post.

Andy.
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Old 31st August 2002, 09:22 AM   #9
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Search the forum for "Brown Dog" and you will find various adapters. I would go for an adapter that would adapt 4 single SMT units to a quad if available and add local decoupling in the process.

If such adapter is not available I would make one myself. It is not that hard.

Petter
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Old 31st August 2002, 12:02 PM   #10
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Default Quad adapters

AFAIK Brown Dog is not making any singles to quad adapters: only duals.

Which is a pity, because the ART DI/O DAC, which is one of the most modded units right off the shop, uses quads. And one of the better mods is using AD825s.

People are using LT1362/1365 instead, FET biased to class A. But they are expensive quads.


Carlos
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