> I have not looked at these much, as I'm not seeing an application in any =
of my
> projects. But, the background light rejection is interesting. I'd expect =
the IR
> emitter to be modulated (pulse stream) and the detector respond only to
> the pulse stream, not to any DC present due to background light.

Not sure if Russell intended to put a link into his mail for the document, =
but I didn't see it.

Looks like it came from this page: -
http://www.silabs.com/products/sensors/infraredsensors/Pages/si114x.aspx

6 application notes there.



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