I am facing a choice regarding to use or not to use a ferrite bead in series with the VDDANA analog power domain. Like shown in below chart, Microchip advises to use a ferrite bead on the analog power domain for some application, to filter digital noise before it hits the DAC/ADC ( on page 1899).
What is your experience with this, with regard to analog measurement performance (inline current sensing)?
The datasheet does not provide a specific part, but says; “The bead should provide enough impedance (i.e., 50Ω at 20 MHz and 220Ω at 100 MHz) to separate the digital and analog power domains. Make sure to select a ferrite bead designed for filtering applications with a low DC resistance to avoid a large voltage drop across the ferrite bead.”