Internally, DAC38RF82 (DAC38RF89) comprises a digital subsystem, an analog subsystem, and a clock subsystem. Ideally, the power supply scheme should be partitioned according to these three relatively independent blocks to minimize interactions between them. Most importantly, sensitive analog and clock circuit power supply must be separated from digital switching noise to reduce direct coupling and mixing of switching spurs. Table 138 shows the power supply rails for DAC38RF82 (DAC38RF89) grouped under their respective domains.
|Supply rail||Nominal voltage (V)||Domain|
An example power supply scheme suitable for most applications of DAC38RF82 (DAC38RF89) is shown in Figure 149. It is recommended to use ferrite beads (FB) to isolate the individual rails from each other.