Re: To JL (TI ADC pb)

On Thu, 03 Apr 2008 11:15:17 +1300, Terry Given <my_name@xxxxxxxx>
wrote:

John Larkin wrote:
On Wed, 02 Apr 2008 22:00:57 +0200, Fred Bartoli <" "> wrote:


I've been aways for a few days and the spam activity seems to have
gotten worse in the meantime.

Well, IIRC you once mentioned some some bad experience (high latchup
sensitivity) with some TI ADCs.

Can you tell us a bit more?

I right now have some pretty weird behavior with an ADS8327
http://focus.ti.com/docs/prod/folders/print/ads8327.html (all external
causes thoroughly ruled out).

That is, about a 30 LSBs dead band or jump around each of the 2 or 3
MSBs transitions.


But the blurb says "excellent DC performance."


Strangely this seemed to depend on the number of power up, but now that
all the small power up glitches have been removed the behavior still is
there (new ADCs of course).

Not surprisingly, TI support is as responsive and helpful as a petrified
mollusk so we too are going to ban the part.

Any idea?


I don't recall a TI adc problem. We did have horrible problems with
the THS3062 opamp early this year. After two months of pounding on TI
support, without response, we finally got the VP of Ethics involved,
and they finally confessed that the part is indeed broken.

We had latchup problems with an Analog Devices flash ADC, which they
fixed by discontinuing the part without notice. And we did have
latchup problems with some Burr-Brown octal DACS, before the TI
takeover.

And Bob Pease promised me he'd fix the LM45 but, ten years or so
later, it still latches.

John

Hey John,

on a completely unrelated note, have you seen this? Performance of a
Diode Clamped Linear Amplifier, Fujita & Yamashita, IEEE trans. power
Electronics vol. 23 no.2 march 2008

you might find it interesting

Cheers
Terry

I can't see those journal things. Someone might email me a copy,
anonymously.

John



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