App note: Isolating analog and digital power supplies

Texas Instruments’ advice for isolating digital and analog power supplies in mixed signal circuits.

This application note recommends power supply and ground noise-reduction techniques through the use of bypass capacitors and ferrite beads in TI’s PLL-based clock distribution circuits (CDC) devices. This application note also includes a numeric  example, calculating the value of bypass and filter capacitors for a particular frequency of interest.

The article is written for PLL based clock distribution circuits, but the pointers can be applied to any mixed signal device.

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1 Comment

  1. how about on the analog and digital grounds? what are the best guideline for them? I saw some designs separating the grounds as well using ferrite beads, but is it recommended?

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