DAC0 on Arduino Due unwanted voltage offset

Hi,

I'm new to microcontrollers and the arduino. I'm having some trouble with the DAC0 pin on the Arduino Due. I am measuring with a volt meter the range of the arduino and it seems to be from .497 V - 2.534 Volts. I am using the Arduino Ground as the reference.

Here is my code, I am just alternating the int value of volt from 0 to 4095 to get the range.

int volt;


void setup() {                
  analogWriteResolution(12);
}

void loop() {

   volt = 4095;
    analogWrite(DAC0,volt);

  }

It seems to me that the range should be from 0 to 3.3 Volts...Or at least that there should not be a .5 V offset when I have it nominally turned off.

Thank you

Anybody have an idea?

http://forum.arduino.cc/index.php?topic=223658.new;topicseen#new