Forums

TI opamp

Started by John Larkin March 10, 2015

Has anybody used this one?

http://www.ti.com/product/lme49990

Sounds too good to be true.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   laser drivers and controllers

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

John Larkin <jlarkin@highlandtechnology.com> Wrote in message:
> > > Has anybody used this one? > > http://www.ti.com/product/lme49990 > > Sounds too good to be true. > > > -- > > John Larkin Highland Technology, Inc > picosecond timing laser drivers and controllers > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com > >
I know audiophiles wet their panties over that one...if you do a Google search on it a lot of designs from audio enthusiast sites pop up -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/
On Mon, 9 Mar 2015 23:53:25 -0400 (EDT), bitrex
<bitrex@de.lete.earthlink.net> wrote:

>John Larkin <jlarkin@highlandtechnology.com> Wrote in message: >> >> >> Has anybody used this one? >> >> http://www.ti.com/product/lme49990 >> >> Sounds too good to be true. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> picosecond timing laser drivers and controllers >> >> jlarkin att highlandtechnology dott com >> http://www.highlandtechnology.com >> >> > >I know audiophiles wet their panties over that one...if you do a > Google search on it a lot of designs from audio enthusiast sites > pop up
I'd like to get it into my LT Spice circuit, but TI only furnishes Pspice and Tina models, so I'll have to shoehorn one of them into LT Spice. The models are huge. As a shortcut, I could use the UniversalOpamp model and plug in the key specs, but I can't find documentation on that, either. Like, what does the noise parameter 'en' actually do? Or 'enk' ? -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On a sunny day (Mon, 09 Mar 2015 20:36:05 -0700) it happened John Larkin
<jlarkin@highlandtechnology.com> wrote in
<8hpsfapfh93ej3s33qhqqa4ljmqtjrrvb4@4ax.com>:

> > >Has anybody used this one? > >http://www.ti.com/product/lme49990
0.00001% reminds me of audio amp adds of teh late sixties.
>Sounds too good to be true.
Depends who is listening I suppose. A good audiophile can easily hear 0.000001%.
On Tuesday, 10 March 2015 14:36:09 UTC+11, John Larkin  wrote:
> Has anybody used this one? > > http://www.ti.com/product/lme49990 > > Sounds too good to be true.
Well the LME suggests that they got it when they took over National Semiconductor, so it might be okay. TI has been known to publish data sheets on the basis that if they get enough interest they'll try to make the part that matches the data sheet. -- Bill Sloman, Sydney
On 10/03/15 04:53, bitrex wrote:
> John Larkin <jlarkin@highlandtechnology.com> Wrote in message: >> >> >> Has anybody used this one? >> >> http://www.ti.com/product/lme49990 >> >> Sounds too good to be true. >> >> >> -- >> >> John Larkin Highland Technology, Inc >> picosecond timing laser drivers and controllers >> >> jlarkin att highlandtechnology dott com >> http://www.highlandtechnology.com >> >> > > I know audiophiles wet their panties over that one...if you do a > Google search on it a lot of designs from audio enthusiast sites > pop up >
/Real/ audiophiles don't use opamps !
On 3/9/2015 10:36 PM, John Larkin wrote:
> > > Has anybody used this one? > > http://www.ti.com/product/lme49990 > > Sounds too good to be true.
Note that the GBW is 110MHz on page 1 of the specs :) Nice op-amp!
On Tue, 10 Mar 2015 11:28:27 +0100, David Brown
<david.brown@hesbynett.no> wrote:

>On 10/03/15 04:53, bitrex wrote: >> John Larkin <jlarkin@highlandtechnology.com> Wrote in message: >>> >>> >>> Has anybody used this one? >>> >>> http://www.ti.com/product/lme49990 >>> >>> Sounds too good to be true. >>> >>> >>> -- >>> >>> John Larkin Highland Technology, Inc >>> picosecond timing laser drivers and controllers >>> >>> jlarkin att highlandtechnology dott com >>> http://www.highlandtechnology.com >>> >>> >> >> I know audiophiles wet their panties over that one...if you do a >> Google search on it a lot of designs from audio enthusiast sites >> pop up >> > >/Real/ audiophiles don't use opamps !
/Real/ audiophiles are notorious lunatics. I have a long list somewhere around of idiotic audio terms, like "macrodynamics" and "soundstaging" and "bass speed." This amp looks better than the LT1028. I hope it doesn't have a similar noise peak off the graph. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Tue, 10 Mar 2015 08:44:40 -0500, John S <Sophi.2@invalid.org>
wrote:

>On 3/9/2015 10:36 PM, John Larkin wrote: >> >> >> Has anybody used this one? >> >> http://www.ti.com/product/lme49990 >> >> Sounds too good to be true. > >Note that the GBW is 110MHz on page 1 of the specs :)
Yup. The ADI low-noise amps, still relatively noisy, are slow. The LT1028 is below 1 nv/rthz but has issues.
> >Nice op-amp!
Sure looks it. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
On Tuesday, March 10, 2015 at 10:52:37 AM UTC-4, John Larkin wrote:
> On Tue, 10 Mar 2015 11:28:27 +0100, David Brown > <david.brown@hesbynett.no> wrote: > > >On 10/03/15 04:53, bitrex wrote: > >> John Larkin <jlarkin@highlandtechnology.com> Wrote in message: > >>> > >>> > >>> Has anybody used this one? > >>> > >>> http://www.ti.com/product/lme49990 > >>> > >>> Sounds too good to be true. > >>> > >>> > >>> -- > >>> > >>> John Larkin Highland Technology, Inc > >>> picosecond timing laser drivers and controllers > >>> > >>> jlarkin att highlandtechnology dott com > >>> http://www.highlandtechnology.com > >>> > >>> > >> > >> I know audiophiles wet their panties over that one...if you do a > >> Google search on it a lot of designs from audio enthusiast sites > >> pop up > >> > > > >/Real/ audiophiles don't use opamps ! > > /Real/ audiophiles are notorious lunatics. I have a long list > somewhere around of idiotic audio terms, like "macrodynamics" and > "soundstaging" and "bass speed." > > This amp looks better than the LT1028. I hope it doesn't have a > similar noise peak off the graph.
Nice opamp..Thanks, well lotsa current noise, and the slew rate is a bit slow for a 100MHz GBW. Too bad they don't show the noise plots out past 100kHz. (Maybe someone will measure it?) George H.
> > > > -- > > John Larkin Highland Technology, Inc > picosecond timing laser drivers and controllers > > jlarkin att highlandtechnology dott com > http://www.highlandtechnology.com