External anti-aliasing devices -- are they necessary?

Tech Note: TN0141
Product: RZ, RX
Version: All
Date Added: 2004-09-23

Issue

Anti-aliasing is built in to all processors with sigma-delta DACs or ADCs, including the RX6, RA16SD, RP2.1, RL2, RM1, RM2, and RA16BA. You do not need an external anti-aliasing filter with these devices.

Devices which use PCM DACs or ADCs, such as the RA16PA, RX5, and RV8D do not have a built-in anti-aliasing filter, so it might be necessary to use an external anti-aliasing filter with these devices.