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Old 18th December 2003, 11:49 PM   #1
Ryssen is offline Ryssen  Sweden
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Default replacement for OPA627

Is there a replacement (cheaper) for OPA627,to be used as an
outputstage for a DAC.
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Old 18th December 2003, 11:59 PM   #2
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You might want to look at the AD8610/AD8620.

Some like LM6172 or AD826, they are dual package though.

There is a new AD piece called AD8065, I have not heard anything at all about it.

I like both OPA627 and AD8610/20.

There is nothing better than trying a few different types and making your own decision.

Good luck

KevinLee
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Old 19th December 2003, 12:40 AM   #3
tool49 is offline tool49  Canada
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I second KevinLee's choice of AD8610/AD8620. I would not suggest to go much lower in price range as you might find that the quality difference by the few extra dollars is well worth it.

Hope this helps!
Sébastien
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Old 19th December 2003, 06:36 AM   #4
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OPA627 isn't the only opamp around that fits. In what way are you going to use the opamp, filter, I/V converter, buffer?

AD8610 is good (better) but slightly noisier and can take max +- 13 volts, only in SMD SO08. Check for amps with noise less than 6 nV/sqr Hz and sr > 10 V/us
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Old 20th December 2003, 08:42 PM   #5
Ryssen is offline Ryssen  Sweden
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There are 2 OPA627 in the shematic, the first one is for I/V converter,then there´s a filter then another OPA627 as buffert.
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Old 21st December 2003, 03:01 PM   #6
PMA is offline PMA  Europe
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How about LM741?
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Old 21st December 2003, 03:15 PM   #7
Ryssen is offline Ryssen  Sweden
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Yes, the LM741.I guess you are using it?
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Old 21st December 2003, 05:11 PM   #8
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Quote:
Originally posted by PMA
How about LM741?

or my favorite: lm324,
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Old 21st December 2003, 06:02 PM   #9
mlloyd1 is offline mlloyd1  United States
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you guys are missing out on audio nirvana: the LM709
very rare now, nobody wants to part with theirs

:-)

Seriously, I've been seeing some folks very interested in the LT1363 (I think that's the right number). I haven't tried it myself yet, but I have a buddy that REALLY like it IN SOME APPLICATIONS. NOTE: it is not a JFET input device; sometimes that matters.

mlloyd1
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Old 21st December 2003, 06:13 PM   #10
PMA is offline PMA  Europe
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Quote:
Originally posted by mlloyd1
you guys are missing out on audio nirvana: the LM709
very rare now, nobody wants to part with theirs

:-)

mlloyd1
Very good idea, indeed. But be careful - this part needs sophisticated frequency compensation
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