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Date: Fri, 23 Oct 2015 09:25:52 -0400
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Subject: Re: [geda-user] The Chippocolypse is coming!
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Fri, Oct 23, 2015 at 9:16 AM, Evan Foss <evanfoss AT gmail DOT com> wrote:
> On Fri, Oct 23, 2015 at 3:02 AM, Gabriel Paubert (paubert AT iram DOT es)
> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>> On Thu, Oct 22, 2015 at 03:20:42PM -0400, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>>> On Sat, Oct 17, 2015 at 1:17 AM, al davis (ad252 AT freeelectron DOT net)
>>> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>>> > On Monday 12 October 2015, Bob Paddock
>>> > (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>>> >> Looks mostly like Audio and Audio Op-Amps, among some Line
>>> >> Drivers and even a COP8micro (People really used those?)
>>> >>
>>> >> That Corp makes studio grade parts:
>>> >>
>>> >> http://www.thatcorp.com/
>>> >
>>> > "That" is great if "that" makes what you need, but it's all
>>> > special stuff.  What happens when "that" is EOL?
>>> >
>>> > The big loss here is a high performance op-amp.  I use the
>>> > LM4562 in some designs.  Can anyone recommend a truly comparable
>>> > dual op-amp?  2.7 nv/rtHz noise, 45 mHz GBP, 20 v/us slew rate,
>>> > drives 600 ohms.  I can find alternatives that might meet any
>>> > one of those, but all???
>>> >
>>> > At least when the 4562 is no longer available, since it is an
>>> > op-amp with standard pinout, something else will work with only
>>> > a minor performance hit.  The "minor performance hit"
>>> > alternatives are mostly cheaper.
>>>
>>> That is not too different from the LME49720 which *might* still be out
>>> there in the TO-99 package. For some reason the TO-99 packaged
>>> versions of the LME amplifiers are not being killed off.
>>
>> Surprising, since most manufacturers have obsoleted everything in TO-99
>> package, with very few exceptions.
>
> The funny part is that the LME49720 is really not so hot as a power
> amplifier and despite what they say I would not use it to drive 600
> ohm cables because it could self oscillate. It is however nice for
> small signal stuff.
>
>> For example, and as far as I can tell, Linear Technology has eliminated
>> all TO-99 versions except the LTZ1000A, where the metal can is superior
>> for reasons related to thermal insulation and mechanical stress on the die.

Sorry I miss read this.

> That is bizzar. I get that people hate paying for TO-99 stuff but a
> reference really should be in that package. I have to wonder if they
> are just switching people over to something newer that is available in
> a TO-99. LT makes a few different references.
>
>>     Gabriel
>
>
>
> --
> Home
> http://evanfoss.googlepages.com/
> Work
> http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/



-- 
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Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/