The PCM1690 requires 5 V for the analog supply and 3.3 V for the digital supply. The 5-V supply is used to power the DAC analog and output filter circuitry, and the 3.3-V supply is used to power the digital filter and serial interface circuitry. For best performance, it is recommended to use a linear regulator with the 5-V and 3.3-V supplies.

Five capacitors are required for supply bypassing (see Figure 41). These capacitors must be located as close as possible to the PCM1690 package. The 10-μF capacitors are aluminum electrolytic, while the three 1-μF capacitors are ceramic.