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C55xx - External Components if using SW-defined CODEC

Hi!

If I were to implement a CODEC in SW on the C55xx, how would I implement an external Class-D amplifier?

I'm assuming that the output from the C55xx is in a digital format, so I would not be able to use an analog amplifier. Could I just output a Digital/PWM signal from the DSP directly to the amplifier or am I required to use an external CODEC as well that is connected over I2S?

Thanks and Regards,

James