The DACx311 contain a power-on reset circuit that controls the output voltage during power up. On power up, the DAC register is filled with zeros and the output voltage is 0 V. The DAC register remains that way until a valid write sequence is made to the DAC. This design is useful in applications where knowing the state of the DAC output while powering up is important.

The occurring power-on glitch impulse is only a few millivolts (typically, 17 mV; see Figure 7-34).