New opamp from National

[dkemppai]

I've had them around for a few weeks now... ...even have a so-8 soldered into a dip converter. I have yet to try it. Specs look good, and it should be fast, but am finding that the limiting factor is the +- rail voltage being so low. Very annoying!

-Dan

[halojoy]

quote:
Originally posted by Ilianh
I found this new opamp from national, specs look very promising, anyone ever used it for hifi applications?
http://www.national.com/ds/LM/LMH6624.pdf
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What is the price?
I guess it costs more than NE5534

It does not come in normal DIL, but in SO8 package.
It is for small signals and has slewrate 300MHz.
Supply voltage is only +- 6V
Extreme dc-offset precision performance.
It is not mainly intended for Audio-band.
But might be useable in some mic/riaa amplifier
as it has very low noise, only 0.9nV/-Hz. Like AD797.

I will read some more from the PDF.

/halo
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As there are two threads about the same OP,
I now move my answer here, as this one is a bit more active.
This was the other - it seems dead already:
http://www.diyaudio.com/forums/showt...threadid=11129

/halo - the OP-Amplifier Expert of diyaudio.com

[planet10]

Originally posted by halojoy
As there are two threads about the same OP,
I now move my answer here, as this one is a bit more active.
This was the other - it seems dead already:

Thanx halo... they are now the same thread

dave

[BrianL]

Please read the LMH6624 data sheet and look at the
graphs. It's a big mistake to judge an IC by the bulleted
list at the top of page one.

This low noise figure of 0.92 nV/rt(Hz) is measured at 1MHz.
The graphs show the 1/f corner for the noise to be somewhere
between 10kHz and 100kHz, depending on whether you
are looking at voltage or current noise. So noise in the
audio band is SIGNIFICANTLY higher than the 0.92 nV/rt(Hz)
number.

Note also that noise is particularly difficult to characterize
and most people don't do a very good job. So don't really
expect it to be as advertised.

I would be cautious about trying to use an amp with
1.5GHz GBW for audio applications. This is NOT for the
uninitiated or those with weak constitutions.

[fmak]

I would be cautious about trying to use an amp with
1.5GHz GBW for audio applications. This is NOT for the
uninitiated or those with weak constitutions. [/B][/QUOTE]
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I agree although one ahould limit the bandwidth somewhat. I got my samples ulttra quick with a little circuit board!!

[BrianL]

Yes, given a manufacturer's demo board you should
be able to build a working circuit. But what about
the person who tries to create their own PCB?
What about the person who decides to use
some big audiophile film caps for bypassing?
etc. etc.

I think that for most audio applications one
would be better off with more "normal" parts.