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PCM1863 - I2S Interface Question

Reinhard F.
Prodigy 80 points
Other Parts Discussed in Thread: PCM1863

Hello,

I have a question regarding the I2S interface of the PCM1863 ADC when using it to mix a digital audio signal with an analog one.

As far as I understand, it should be possible to input an I2S signal to one of the GPIO pins of the device (as long as they are configured correctly), mix it with one or more of the analog input channels, and output it again as an I2S signal through the “DOUT” pin. If this is correct, can you confirm that the ADC automatically synchronizes the output data stream with the “LRCK” (input) clock of the I2S interface?

After reading through the user guide of the “PCM186xEVM” I suspect my assumption to be true, because in “Mode 2” the same “LRCK” is used for both the input and output data signal. However, I just want to make sure that my thoughts are correct as this is my first design using this device.

To clarify my question I have created a block diagram that illustrates the signal flow in my design:

 

Regards,

Reinhard F.