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DAC8562: a confused description for DAC8562 output level

Part Number: DAC8562


  I am planned to use DAC8562.

  But the output level confused me quietly.

  When I provode  3.3V power  for AVDD PIN ,and also the internal reference will be used.

  According to EQUATION 1,  the max output level = Vref * Gain . 

                                        when the gain= 2. the max output level = 2.5v * 2 = 5V.

 But Chapter tell us that "The output buffer amplifier is capable of generating rail-to-rail voltages on its output, giving a maximum output range of 0 V to AVDD."

  That means thant my applicaton can only output max output level = AVDD= 3.3 V.

So, I need your help . Which rule should I obey  when I power AVDD with 3.3V and internal reference is used meanwhile GAIN = 2.

Thank you in advance.

Best Regards