The DACx1408 requires 5 power supply inputs: VIO, VDD, VAA, VCC and VSS. VDD and VAA should be at same level. Assuming VIO and VDD/VAA to be different, there are 4 separate power supply sources required. It is recommended to provide a 0.1-µF ceramic capacitor close to each power supply pin. Please note that VCC and VSS have 2 pins each. In addition, a 4.7-µF or 10-µF bulk capacitor is recommended for each power supply. Tantalum or aluminum types can be chosen for the bulk capacitors. There is no sequencing requirement for the power supplies. As the DAC output range is configurable, the power supply headroom should be taken care of for achieving linearity at codes close to power supply rails. When sourcing or sinking current from or to the DAC output, the heat dissipation needs to be considered. For example, a typical application of MZM bias with 25-mA load current from or to 12 channels with 2.5-V power supply headroom can create a power dissipation across the DAC of (12*2.5*25 mA) = 0.75 W. The thermal design to dissipate this much of power may involve inclusion of heat sinks in order to avoid thermal shutdown of the device.