I am having a problem with the TLV5630 DAC. It's a 12 bit DAC, set to a reference voltage of 5V, Avdd = 5V, Dvdd=3.3, Agnd=Dgnd. The output of the DAC is not scaling with the input, i.e. 1V in does not equal 1V out. The device input range I'm seeing is from 0 to 0xaf2, which should be about 3.4V (0xaf2 * 5V)/0xfff, but it is maxed out at the reference voltage at this point. I don't understand why this might be. I've looked the manual over several times and I don't see any reason why this should happen. Please, can someone help me?