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'[OT:] Looking for specific temp sensor'
2003\08\11@103224 by rrc124+

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I am looking for a temperature sensor that fits this description:

-Degree F scale, not C if possible

-Analog output with high gain (around 20mV/Degree) to
provide convenient bit weights when driving
the input of an ADC with a 2.5V or 5V reference

-DIP or TO-something package for easy soldering/handling

-Min component count to make it work... the simpler the better, I don't need any fancy features like super low power, multiple output channels, nothing like that.

The closest I could find is the Maxim MAX6612 but it does not fit the package (only available in SC70) or degrees in F requirements ( http://pdfserv.maxim-ic.com/arpdf/MAX6612.pdf ).
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2003\08\27@180121 by Alan B. Pearce

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>-Analog output with high gain (around 20mV/Degree) to
>provide convenient bit weights when driving
>the input of an ADC with a 2.5V or 5V reference
>
>-DIP or TO-something package for easy soldering/handling

IIRC the old National Semiconductor LM34 fits this requirement. Reads in F,
TO92 or metal equiv can. I may have the exact part number incorrect, but
they did make one which had a degrees C and a degrees F version. Each was
10mV/degree IIRC.

>-Min component count to make it work... the simpler the
>better, I don't need any fancy features like super low
>power, multiple output channels, nothing like that.

again IIRC one resistor, 2 and a capacitor for long leads, add another
resistor if you wanted negative temperatures.

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2003\08\27@182619 by Picdude

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On Monday 11 August 2003 10:03, Alan B. Pearce scribbled:
> >-Analog output with high gain (around 20mV/Degree) to
> >provide convenient bit weights when driving
> >the input of an ADC with a 2.5V or 5V reference
> >
> >-DIP or TO-something package for easy soldering/handling
>
> IIRC the old National Semiconductor LM34 fits this requirement. Reads in F,
> TO92 or metal equiv can. I may have the exact part number incorrect, but
> they did make one which had a degrees C and a degrees F version. Each was
> 10mV/degree IIRC.

The LM35 is the deg-C version.

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2003\08\27@191701 by Dave Tweed

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"Alan B. Pearce" <spam_OUTA.B.PearceTakeThisOuTspamRL.AC.UK> wrote:
> > -Analog output with high gain (around 20mV/Degree) to
> > provide convenient bit weights when driving
> > the input of an ADC with a 2.5V or 5V reference
> >
> > -DIP or TO-something package for easy soldering/handling
>
> IIRC the old National Semiconductor LM34 fits this requirement. Reads in F,
> TO92 or metal equiv can. I may have the exact part number incorrect, but
> they did make one which had a degrees C and a degrees F version. Each was
> 10mV/degree IIRC.
>
> > -Min component count to make it work... the simpler the
> > better, I don't need any fancy features like super low
> > power, multiple output channels, nothing like that.
>
> again IIRC one resistor, 2 and a capacitor for long leads, add another
> resistor if you wanted negative temperatures.

I just got a flyer from Analog Devices today about temperature sensing.

Their AD590 looks like a good choice: it functions as a temperature-
dependent current source with a coefficient of 1uA/K, laser trimmed for
minimal error at 298.2K (25C). Put it at the end of your long cable and
drive it with up to 30V. A precision 10K resistor used to sense the
current will give you 4.232 volts at the upper limit of 150C and a scale
factor of 10mV/K. A 12-bit ADC with a 4.096V reference would give you
0.1K resolution and an upper measurement limit of 136.4C.

Now available in SOIC in addition to the traditional TO-52 can, but the
can might be more appropriate for your underwater environment.

-- Dave Tweed

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