What happens if the input to the A/D module has a negative range before the positive range in concern?

e.g, I have a signal conditioning circuit converting the reading of a sensor to a range of: -6 to 5V. I'm only concerned with the values 0-5V.

How will the negative range affect the A/D operation? or shall I eliminate the negative range. And how?

 

How will the negative range affect the A/D operation? or shall I eliminate the negative range. And how?

You can damage the A/D on the PIC.

 

You can damage the A/D on the PIC.

That's what I thought of. so, do you have anu suggestions to eliminate that unwanted negative range?

 

diode in series with the output

 

I have tried this too but didn't work. The diode showed a strange response. When it's connected to -0.5 for example the output was around 2.5V . I have the 1N4007

 

Have you configured the ADC in the bipolar mode?

 

You can try with Zener diodes or Schottky diodes but the dynamic range of the ADC may be reduced if you care.
I am sure that Reshma may have a better answer than this she is really cool.

 

I have 7 years experience with this part,...and 2 years experience with dsPIC33FJ256GP506, do you still require help with this problem ?