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AD5263 issues

Hi,

On a project, I'm working with 2 AD5263BRUZ20. Some settings I use : 

- SPI (2,5MHz)
- Vdd : +5V
- Vss : -5V
- voltage on terminals : Max : +/-3V (Sinus)

Sometimes, some potentiometers "burns", they don't work anymore. And I don't know why. Do you have some explains? I can give you more information if you want.

Regards,

Florian