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Date: Sat, 24 Oct 2015 06:15:22 +0000
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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 9:28 PM, Gabriel Paubert (paubert AT iram DOT es)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> On Fri, Oct 23, 2015 at 09:25:52AM -0400, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> 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:
>> >> 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.
>>
>
> Thanks for the second reply, I couldn't understand the first one.
>
>> > 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.
>
> This is becoming offtopic, but the LTZ1000A is, to my knowledge, still
> the best reference available in terms of noise and long term stability,
> and until a few years ago, I only used buried Zener references when I
> needed high stability.

It is. If you look at any of the tear downs people do of meters above
6 digits they are all using that reference or one made by LT custom
for Fluke.

> But then, Linear started to produce a line of low noise bandgap
> references that are fairly close in performance to buried Zeners,
> especially the LTC6655, which is better than most buried Zeners.

I will read up on those. That sounds cool.

> This said, I use more LT6654 than LTC6655, it's clearly worse in the low
> frequency noise range, but sufficient for most of my needs and much more
> robust on the input (38V max vs 13.2).
>
> Both the LTC6655 and LT6654 are available in SMD plastic and ceramic
> package, but I've only used the plastic ones. The ceramic package
> has stability advantages over long term and temperature cycling
> which are of no interest in my applications.

Nice

>     Gabriel

Thanks for this it actually is useful in something I am playing with now.

-- 
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