The DAC7811 can operate within the specified supply voltage range of 2.7 V to 5.5 V. The power applied to VDD should be well regulated and low noise. Switching power supplies and DC-DC converters often have high frequency glitches or spikes riding on the output voltage. In addition, digital components can create similar high-frequency spikes. This noise can easily couple into the DAC output voltage through various paths between the power connections and analog output. To further minimize noise from the power supply, a strong recommendation is to include a 1-µF to 10-µF capacitor and 0.1-µF bypass capacitor. The required supply current vs Logic Input voltage or temperature is displayed in Typical Characteristics. The power supply must meet the aforementioned current requirements.