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Ryssen 18th December 2003 11:49 PM

replacement for OPA627
Is there a replacement (cheaper) for OPA627,to be used as an
outputstage for a DAC.

KevinLee 18th December 2003 11:59 PM

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


tool49 19th December 2003 12:40 AM

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!

peranders 19th December 2003 06:36 AM

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

Ryssen 20th December 2003 08:42 PM

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.

PMA 21st December 2003 03:01 PM

How about LM741? ;) ;)

Ryssen 21st December 2003 03:15 PM

Yes, the LM741.I guess you are using it?

millwood 21st December 2003 05:11 PM


Originally posted by PMA
How about LM741? ;) ;)

or my favorite: lm324, :)

mlloyd1 21st December 2003 06:02 PM

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.


PMA 21st December 2003 06:13 PM


Originally posted by mlloyd1
you guys are missing out on audio nirvana: the LM709
very rare now, nobody wants to part with theirs



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

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