Audio DAC

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In earlier versions of the mainboard, the Audio DAC is a Rohm BU9480F interpolating I²S DAC. It takes in three digital signals: data, bit clock, and word clock, and emits stereo audio that has been up-sampled by a factor of 2 (using the word clock to choose between "the previous sample" and "the 50% weighted interpolated sample").

In later revisions of the mainboard it's been integrated into the same package as the Video DAC in the AVDC-NUS or MAV-NUS.

Either way, the RCP's Audio Interface is responsible for providing data to it.