3.4.12 Audio Class D

The SAM9X75-Curiosity board embeds a mono/single-ended channel Class D audio output.

The following figure shows the Audio Class D schematic.

Warning: The threshold of the featured transistor bridge Q9 (SI3552DV-T1-GE3) implemented on the audio output is too high, which results in a signal distortion. For best audio quality, we recommend replacing Q9 with either of these footprint-compatible alternates: FDC6327C (Fairchild/Onsemi) or BSL215CH (Infineon).
Figure 3-36. Audio Class D Schematic

The following table shows the Audio Class D signal description.

Table 3-20. Audio Class D Signal Description
PIOSignal NameSignal Description
PA18CLASSD_L0High side PMOS control
PA19CLASSD_L1Low side NMOS control