SBAS438C May 2008 – November 2019 DAC9881
The DAC9881 operates within the specified supply voltage range of 2.7 V to 5.5 V. The power applied to AVDD 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 current consumption on the AVDD pin, the short-circuit current limit, and the load current for the device is listed in Electrical Characteristics. The power supply must meet the aforementioned current requirements.