Frequently Asked Question
What should I consider regarding the power supplies for a DDS?
Most DDS devices will have multiple supply pins labeled as "analog supply" and "digital supply," which identifies the nature of the stage that the individual pin is powering. It is recommended that separate analog and digital power supplies be used to power the associated pins. The preferred analog power supply is a linear supply with ripple limited to <1%. Digital supplies are typically switching supplies with output ripple in the range of up to 5%. It is common practice to utilize 3-terminal regulators to supply the voltage for mixed-signal devices that require non-standard voltage supplies for their analog sections.