Hello,

Dave or anyone: Do you have a source for the MPX4200A.  A search with
www.findchips.com brought up nothing.  A Canadian source would be VERY
preferable, but any source would be welcomed.  What did you pay for it?

Regards,
Donovan


> Chris Loiacono wrote...
>
> >Dave, what temperature range have you tested your design in?
>
> The product using the MPX4200A is specified for operation between -20C
> and +70C, but the sensor itself is rated for -40C to +125C (Motorola
> designed it for automotive use in turbocharger systems).  During
> development, I tested from -80C to +130C with good results.
>
> The product is an analog design that re-scales the MPX4200A output to a
> different offset and span, and adds a second level of temperature
> compensation for both offset and span shift to keep the final output to
> within +/- 0.25% of span over the full temperature range.  I calibrate
> the units to within 0.05% of span, giving some margin for aging, supply
> variations, and so forth.  I've had no trouble doing this, which
> indicates how well-behaved the basic sensor is.
>
> The error behavior you're seeing in the MPX5700 is certainly odd, to say
> the least; I've seen nothing like that on the MPX4200A- only a gradual
> change in output scale factor over temperature, mostly at low
> temperatures.  There appears to be almost no zero shift with
> temperature, less than 10 millivolts.  Makes me wonder if the MPX5700
> has some sort of design flaw.
>
> Dave
>
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