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Date:	Fri, 23 Oct 2015 09:16:13 -0400
Message-ID:	<CAM2RGhS4=PPXf1L5a_E9uABrLviY+L8n+0Opgi6_ZGnipi4grg@mail.gmail.com>
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 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.

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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