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amplifier database

zvoros
Prodigy 135 points
Other Parts Discussed in Thread: OPA991, OPA607

Hi all,

I am trying to collect op amp properties for a local database, and I was wondering, whether such a thing already exist. The problem is that relevant data must be dug out of the datasheets. E.g., OPA607 and OPA991 list a different set of attributes under product details.

The "download to excel" option of the main page of the amplifier sections isnot very useful, either, because this excel table contains only the bare minimum of data.

I would like to be able to compare e.g., the noise levels of various amplifiers, or the common mode rejection ratio etc.

Also, since engineering tasks always involve trade-offs, it would be very useful to have a means of finding out how e.g., the offset voltage of a particular set of amplifiers correlates with the output noise, etc. I could generate the plots, if these data were available, but they don't seem to be.

Has anyone a suggestion as to how a decent database of op amps could be constructed.

Thanks,

Zoltán

  • 0
    TI__Guru**** 164876 points

    Hello Zoltan,

    The closest to a database is the downloadable search tool called "Selguide"

    http://www.ti.com/tool/OPAMPS-SELGUIDE

  • Former Member
    0 Former Member

    Hello Zoltán,

    I noticed you mentioned that the "dowload to excel" option on the amplifier product page does not give enough information.  Out of curiosity, I went on the page, scrolled down, checked some more parameters, and then tried downloading the excel spread sheet again.  I found that if I did this, the new parameters were also included.  Below, you can see how I checked off voltage noise at 1kHz and CMRR.  This may not be everything you want, but it's better than the default.

    Regards,

    Daniel

  • 0 in reply to Ron Michallick
    Prodigy 135 points

    Ronald,

    Many thanks for the prompt reply! The self-guide is a step in the right direction. It is a pity that these data are not not accessible in an easy-to-use format. I would like to analyse the data on my own. Such tools always lock you into the interpretation of those who wrote it, and it is highly unlikely that different people would have the same criteria.

    Best,

    Zoltán

  • 0 in reply to Former Member
    Prodigy 135 points

    Greetings Daniel,

    Many thanks for the suggestion! It is not exactly what I sought, but it gives a reasonable workaround, so I will mark the issue as resolved.

    Best,

    Zoltán

  • 0
    Guru 48395 points

    Morning Zoltan, 

    What a loaded question - as it turns out I led a team of 5 people to extract an internally consistent parametric database for industrywide op amps some years back - if you do a lot of datasheets as I have done, you know there is little consistency across the industry on some specifications - for instance, precision amps have an odd practice of reporting the 1kHz spot noise as the noise - maybe, in high speed we report the flatband value. Probably the most slippery spec is output current - means lots of different things to different marketers and apps folks. Even the relatively simple gain bandwidth product is prone to error - this article tried to peal some of those layers back, 

    https://www.planetanalog.com/why-is-amplifier-gbp-so-confusing-insight-12/

  • 0 in reply to Michael Steffes
    Prodigy 135 points

    Michael,

    Many thanks for the interesting article! 

    Zoltán