[Bill]

I was just reading my new copy of Electronic Design when I came across
an ad for an audio op-amp that National Semiconductor puts out. The
distortion is absurdly low at 0.00003%, (yeah, point 4 zeros).
Here's the URL for anybody who may be into building their own stuff.

http://www.national.com/pf/LM/LM4562.html

It got my attention in regards to the person who wanted to look at super
low distortion in a tube amplifier and this might make a good pre-amp
for going into a scope.

I just thought I'd add this to the mix.
Bill Baka

[Paul Stamler]

"Bill" wrote in message
...
I was just reading my new copy of Electronic Design when I came across
an ad for an audio op-amp that National Semiconductor puts out. The
distortion is absurdly low at 0.00003%, (yeah, point 4 zeros).
Here's the URL for anybody who may be into building their own stuff.

http://www.national.com/pf/LM/LM4562.html

It got my attention in regards to the person who wanted to look at super
low distortion in a tube amplifier and this might make a good pre-amp
for going into a scope.

I just thought I'd add this to the mix.

It's got some nice numbers. IIRC there were only three potential pitfalls:
it won't go over +/- 18V supplies, which could become an issue in some
circuits; the current noise density is higher than in some competitive chips
(e.g. the 5534a), which could be a problem with higher source impedances;
and the low-frequency rise in voltage and current noise densities starts at
a pretty high frequency, about 300Hz. If you can work around those issues,
this might be a very nice chip for designers to work with.

They sure give you a stack of data...33 pages in the .pdf.

Peace,
Paul

[Bill]

Paul Stamler wrote:
"Bill" wrote in message
...
I was just reading my new copy of Electronic Design when I came across
an ad for an audio op-amp that National Semiconductor puts out. The
distortion is absurdly low at 0.00003%, (yeah, point 4 zeros).
Here's the URL for anybody who may be into building their own stuff.

http://www.national.com/pf/LM/LM4562.html

It got my attention in regards to the person who wanted to look at super
low distortion in a tube amplifier and this might make a good pre-amp
for going into a scope.

I just thought I'd add this to the mix.

It's got some nice numbers. IIRC there were only three potential pitfalls:
it won't go over +/- 18V supplies, which could become an issue in some
circuits; the current noise density is higher than in some competitive chips
(e.g. the 5534a), which could be a problem with higher source impedances;
and the low-frequency rise in voltage and current noise densities starts at
a pretty high frequency, about 300Hz. If you can work around those issues,
this might be a very nice chip for designers to work with.

They sure give you a stack of data...33 pages in the .pdf.

Peace,
Paul


I was thinking that since National always did kind of specialize in
audio oriented amplifiers that that particular device might just be a
good starting point at a manufacturer that makes a lot of good parts.
Bill Baka