ADC / DAC limits

Hello evyrone, I am currently working on the Arduino due board and ihave some issues:

I am using the ADC and the DAC to sample sine wave. in the Datasheet is says that to maximum analog output so on the DAC for example is between 1/5 Vref and 5/6 Vref, with Vref is 3.3 V for the DUE But when I test it, when my input on the analog input is higher than 2.2 V, the analog output on the DAC is destroyed on goes back to zero.. Is it normal ? what can i do against that ?

Thank you very much