"David Brown" <david.brown@hesbynett.no> wrote in message news:mdmgut$l4f$2@dont-email.me...> On 10/03/15 04:53, bitrex wrote: >> John Larkin <jlarkin@highlandtechnology.com> Wrote in message: >>> >>> >>> Has anybody used this one? >>> >>> http://www.ti.com/product/lme49990 >>> >>> Sounds too good to be true. >>> >>> >>> -- >>> >>> John Larkin Highland Technology, Inc >>> picosecond timing laser drivers and controllers >>> >>> jlarkin att highlandtechnology dott com >>> http://www.highlandtechnology.com >>> >>> >> >> I know audiophiles wet their panties over that one...if you do a >> Google search on it a lot of designs from audio enthusiast sites >> pop up >> > > /Real/ audiophiles don't use opamps ! >Yes they do. They use _tube_ op amps.
TI opamp
Started by ●March 10, 2015
Reply by ●March 10, 20152015-03-10
Reply by ●March 10, 20152015-03-10
On Tue, 10 Mar 2015 14:17:12 -0400, "Tom Miller" <tmiller11147@verizon.net> wrote:> >"David Brown" <david.brown@hesbynett.no> wrote in message >news:mdmgut$l4f$2@dont-email.me... >> 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 ! >> > >Yes they do. They use _tube_ op amps.Audiophiles use solid state... audiophools use tubes ;-) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Reply by ●March 10, 20152015-03-10
John Larkin wrote:> > 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.I'm surprised they support Tina. Nobody ever talks about using it, except Robert (THE Robert).
Reply by ●March 11, 20152015-03-11
On Tue, 10 Mar 2015 22:56:59 -0400, "Tom Del Rosso" <td005@verizon.net.invalid> wrote:> >John Larkin wrote: >> >> 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. > >I'm surprised they support Tina. Nobody ever talks about using it, except >Robert (THE Robert). >Tina is TI's counter to LT Spice. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●March 11, 20152015-03-11
On 3/10/2015 9:57 AM, John Larkin wrote:> 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.I need help understanding this: How can an op-amp with an output shown on fig.27 of the data sheet be zero at about 5MHz when it has a GBW of 110MHz?
Reply by ●March 11, 20152015-03-11
On Wed, 11 Mar 2015 07:22:15 -0500, John S <Sophi.2@invalid.org> wrote:>On 3/10/2015 9:57 AM, John Larkin wrote: >> 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. > >I need help understanding this: How can an op-amp with an output shown >on fig.27 of the data sheet be zero at about 5MHz when it has a GBW of >110MHz?That's the slew rate limit, which is low for this amp. That saves power but limits it for some appplications. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●March 11, 20152015-03-11
Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:> Audiophiles use solid state...OT, related: http://www.enjoythemusic.com/hificritic/vol5_no3/listening_to_storage.htm
Reply by ●March 11, 20152015-03-11
On Tue, 10 Mar 2015 22:56:59 -0400, "Tom Del Rosso" <td005@verizon.net.invalid> wrote:> >John Larkin wrote: >> >> 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. > >I'm surprised they support Tina. Nobody ever talks about using it, except >Robert (THE Robert).I use it. It works well for simple things like sequential filters and anything that can use fairly simple models.
Reply by ●March 11, 20152015-03-11
On Tue, 10 Mar 2015 20:28:36 -0700, John Larkin <jlarkin@highlandtechnology.com> wrote:>On Tue, 10 Mar 2015 22:56:59 -0400, "Tom Del Rosso" ><td005@verizon.net.invalid> wrote: > >> >>John Larkin wrote: >>> >>> 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. >> >>I'm surprised they support Tina. Nobody ever talks about using it, except >>Robert (THE Robert). >> > >Tina is TI's counter to LT Spice.Except that it's closed. You have to buy the real deal to use non-TI SPICE models. Even though I use TINA-TI, it's not worth paying for the real thing (did that in the last job).
Reply by ●March 12, 20152015-03-12
On Tuesday, March 10, 2015 at 12:22:34 PM UTC-4, Gerhard Hoffmann wrote:> Am 10.03.2015 um 15:57 schrieb John Larkin: > > 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. > > The AD797 is not significantly noisier or slower, if at all. > I really like the ADA4898-2. > > Depending on how it's measured, a little bit lower ft than the LME, but > more than twice the slew rate, no 300 KHz noise mole hill like LT1028, > and with 2 amplifiers/SO-8 quite a good price, especially if you average > 20 devices for _really_ low voltage noise from low impedance sources. > > < http://www.hoffmann-hochfrequenz.de/downloads/lono.pdf > > > and, related: > > < > http://www.hoffmann-hochfrequenz.de/downloads/NoiseMeasurementsOnChemicalBatteries.pdf > >Nice write-up, thanks. Nice amplifier. Surprising how much 'noise' batteries make at 50Hz. ;-) Cheers, James Arthur
