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From: Rob Gaddi on 30 Sep 2009 11:49
On Wed, 30 Sep 2009 11:29:23 +0100
"Bill Davy" <Bill(a)SynectixLtd.com> wrote:

> "-jg" <jim.granville(a)gmail.com> wrote in message
> news:30f081a3-2dfb-4cec-b825-e86d22373f0e(a)y10g2000prg.googlegroups.com...
> On Sep 30, 12:40 am, "Bill Davy" <B...(a)SynectixLtd.com> wrote:
> > Can anyone point me at something? Not going fast (480 samples/sec).
> > Must be
> > available immediately (going down an oil well just after Christmas).
> >
> > TIA,
> > Bill
>
> TI shows 42 candidates on their selection guide, and this one sounds a
> good fit
>
> http://focus.ti.com/docs/prod/folders/print/ads1278-ht.html
>
> [" * Available in Extreme (–55°C/210°C)
> Temperature Range(1)
> # APPLICATIONS * Down-Hole Drilling "] bingo!
>
> -jg
>
>
> Thanks for this. Looks good (low power, good temperature range).
> Bill
>
>

Yowza. TI's listing them at $125 by the 100 for just the standard
mil-temp rated parts. Let me tell you how glad I am to not need
down-hole temperature ratings on any of my designs.

--
Rob Gaddi, Highland Technology
Email address is currently out of order

From: David Brown on 30 Sep 2009 14:28
Rob Gaddi wrote:
> On Wed, 30 Sep 2009 11:29:23 +0100
> "Bill Davy" <Bill(a)SynectixLtd.com> wrote:
>
>> "-jg" <jim.granville(a)gmail.com> wrote in message
>> news:30f081a3-2dfb-4cec-b825-e86d22373f0e(a)y10g2000prg.googlegroups.com...
>> On Sep 30, 12:40 am, "Bill Davy" <B...(a)SynectixLtd.com> wrote:
>>> Can anyone point me at something? Not going fast (480 samples/sec).
>>> Must be
>>> available immediately (going down an oil well just after Christmas).
>>>
>>> TIA,
>>> Bill
>> TI shows 42 candidates on their selection guide, and this one sounds a
>> good fit
>>
>> http://focus.ti.com/docs/prod/folders/print/ads1278-ht.html
>>
>> [" * Available in Extreme (–55°C/210°C)
>> Temperature Range(1)
>> # APPLICATIONS * Down-Hole Drilling "] bingo!
>>
>> -jg
>>
>>
>> Thanks for this. Looks good (low power, good temperature range).
>> Bill
>>
>>
>
> Yowza. TI's listing them at $125 by the 100 for just the standard
> mil-temp rated parts. Let me tell you how glad I am to not need
> down-hole temperature ratings on any of my designs.
>

Nah, that price is specifically for the -HT high temperature versions.
The military temp parts are the ADS1278 (without the HT), and are about $25.

Anyway, that's nothing compared to the space-rated parts. It can't be
cheap building a satellite...

<http://focus.ti.com/docs/prod/folders/print/ads5444-sp.html>
From: Jim Stewart on 30 Sep 2009 14:46
Bill Davy wrote:
> Can anyone point me at something? Not going fast (480 samples/sec). Must be
> available immediately (going down an oil well just after Christmas).

I successfully used "S" version Analog Devices
AD7713's 20 years ago in geothermal downhole tools
at 100 deg C.
From: -jg on 30 Sep 2009 23:55
On Oct 1, 3:49 am, Rob Gaddi <rga...(a)technologyhighland.com> >
> Yowza.  TI's listing them at $125 by the 100 for just the standard
> mil-temp rated parts.  Let me tell you how glad I am to not need
> down-hole temperature ratings on any of my designs.

That may be eye-watering, but it's still WAY cheaper than replacing
one that failed!! - in the scheme of "need a sensor down a hot hole",
it really is relatively cheap :)

-jg
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