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interface an +-10V analog signal to the ADC

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mystery

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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
 

opterix

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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.
 

IanP

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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
 

angelote

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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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