Hello.

I am using the ADC using Application note AN700
(http://ww1.microchip.com/downloads/en/AppNotes/00700a.pdf) with a
16F628.

I used the
http://www.sprut.de/electronic/pic/programm/compadc/compadc2.gif
circuitry being similar to the one being included in the AN. The blue
R3 is missing in my setup on purpose. "Eingang" means "voltage source
to be measured". I changed R1, R2 and R3 to define a special area of
voltage and a special value of voltage this area of voltage is to
surround. So in my case the VS's value is changing from 0 to 5 volts.
And the resistors force the ADC to subdivide 1,25 V to 4,56 V (into
1024 steps).

Unfortunately it works exactly the other way round. So values are
measured between 0 and 1,25 V and 4,56 V and 5 V and not in between.

What can be the cause for that - which part could be faulty ?

Regards

T.K.












                                              Hat mal funktiert

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