1. Forum
  2. USENET
  3. sci.electronics.design

  • OPA955

    From john larkin@jl@htigct.com to sci.electronics.design on Mon Jul 27 14:16:21 2026
    From Newsgroup: sci.electronics.design


    https://www.ti.com/product/OPA955

    They call this a TIA but it's really an opamp. Fast, low noise, at
    least above 10KHz.

    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From Phil Hobbs@pcdhSpamMeSenseless@electrooptical.net to sci.electronics.design on Mon Jul 27 21:56:25 2026
    From Newsgroup: sci.electronics.design

    john larkin <jl@htigct.com> wrote:

    https://www.ti.com/product/OPA955

    They call this a TIA but it's really an opamp. Fast, low noise, at
    least above 10KHz.



    Probably best for capacitive sources like photodiodesrCoGBW of 11 GHz and
    2750 V/us is pretty lopsided!

    Cheers

    Phil Hobbs
    --
    Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics
    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From john larkin@jl@htigct.com to sci.electronics.design on Mon Jul 27 15:39:39 2026
    From Newsgroup: sci.electronics.design

    On Mon, 27 Jul 2026 21:56:25 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    john larkin <jl@htigct.com> wrote:

    https://www.ti.com/product/OPA955

    They call this a TIA but it's really an opamp. Fast, low noise, at
    least above 10KHz.



    Probably best for capacitive sources like photodiodesuGBW of 11 GHz and
    2750 V/us is pretty lopsided!

    Cheers

    Phil Hobbs

    They suggest using it with APDs.

    But it may be vaporware. TI has been doing that lately, announcing
    parts you can't get with a disclaimer that maybe you never will.

    I was going to use a cool IC dc/dc converter, UCC33421, but it was
    mostly bait-and-switch.

    We finally got a few samples, but delivery is November, maybe.

    The other thing TI is doing is 2-page "data sheets" with almost no
    content. I hope the bean counters haven't taken over.

    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From john larkin@jl@htigct.com to sci.electronics.design on Tue Jul 28 12:19:16 2026
    From Newsgroup: sci.electronics.design

    On Mon, 27 Jul 2026 15:39:39 -0700, john larkin <jl@htigct.com> wrote:

    On Mon, 27 Jul 2026 21:56:25 -0000 (UTC), Phil Hobbs ><pcdhSpamMeSenseless@electrooptical.net> wrote:

    john larkin <jl@htigct.com> wrote:

    https://www.ti.com/product/OPA955

    They call this a TIA but it's really an opamp. Fast, low noise, at
    least above 10KHz.



    Probably best for capacitive sources like photodiodesuGBW of 11 GHz and >>2750 V/us is pretty lopsided!

    Cheers

    Phil Hobbs

    They suggest using it with APDs.

    But it may be vaporware. TI has been doing that lately, announcing
    parts you can't get with a disclaimer that maybe you never will.

    I was going to use a cool IC dc/dc converter, UCC33421, but it was
    mostly bait-and-switch.

    We finally got a few samples, but delivery is November, maybe.


    Got some!

    https://www.dropbox.com/scl/fi/ctghu8a23t7yr9rgxiy9u/UCC33421.jpg?rlkey=q8adhuy3tnwu8ajqaptv1xdic&raw=1

    Got to admit it's slick, a fraction of the size of a potted dc/dc
    converter. And the 5v output is regulated.

    I'll test it for noise and such, and have it x-rayed.

    --- Synchronet 3.22a-Linux NewsLink 1.2