The TAS2563 device features the pulse-density modulation (PDM) microphone interface. This allows the smart amplifier to be used in two-way audio applications with up to two digital microphones. In most two-way audio applications, echo cancellation algorithms are implemented to avoid the audio played on the speaker to be coupled on the microphone recording. The TAS2563 also features echo reference feedback data, helping to significantly eliminate the speaker echo from the microphone recording. This document explains how to configure TAS2563 for using these features and shows an example of how data is received back at the host controller.