This is a document that describes the known bugs and anomalies of ADAU1442/ADAU1445/ADAU1446. The document also lists the recommended workarounds for these issues.
This application note describes known bugs, anomalies, and recommended workarounds for the ADAU1442, ADAU1445, and ADAU1446 SigmaDSP Digital Audio Processors. The document is intended to help designers manage issues related to these specific silicon revisions.
The validity bit is internally hardcoded to logic high, which indicates invalid data according to the S/PDIF specification, potentially causing receiving ICs to ignore the audio data.
Audio data should be routed to the serial ports and then to an I2S-to-S/PDIF transceiver IC instead of connecting directly to the SPDIFO pin.