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interface an +-10V analog signal to the ADC

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I want to interface an +-10V analog signal to the ADC of the microcontroller.
I need to convert the incoming signal to the 0-3.3V interval.

Is there any schematic or application note for this?

thanks
 

Be recursive, you could use and amp-op to reduce the amplitude of the signal, and then mount it on a DC signal. Its not a elegant solution but it should work.
 

Very similar problem was discussed here some time ago ..

Take a look at: example.png
In your case:
Vr-->0v
Vref-->3.3V
All you need to do is to calculate values of R1, R2 and R3 ..
(you may need to include the input impedance of the ADC)

Regards,
IanP
 

Look at ADS1251's pdf from TI.

There is a schematic for a voltage range converter. You can analyse and adapt it for your needs.
 

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