For best performance, the DAC128S085 power supply should be bypassed with at least a 1-µF and a 0.1-µF capacitor. The 0.1-µF capacitor must be placed right at the device supply pin. The 1-µF or larger valued capacitor can be a tantalum capacitor, while the 0.1-µF capacitor must be a ceramic capacitor with low ESL and low ESR. If a ceramic capacitor with low ESL and low ESR is used for the 1-µF value and can be placed right at the supply pin, the 0.1-µF capacitor can be eliminated. Capacitors of this nature typically span the same frequency spectrum as the 0.1-µF capacitor, and thus eliminate the need for the extra capacitor. The power supply for the DAC128S085 should only be used for analog circuits.

Avoid the crossover of analog and digital signals. This helps minimize the amount of noise from the transitions of the digital signals from coupling onto the sensitive analog signals, such as the reference pins and the DAC outputs.