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How to terminate the unused MC, MD and MS pins on the PCM2705?

Other Parts Discussed in Thread: PCM2705


I'm building a one chip USB DAC around the PCM2705, and I don't need to use the SPI interface. I noticed that the MC, MD and MS pins have internal pull-down resistors (stated in the datasheet). However, should I ground those pins or should I leave them floating? I don't like the idea of leaving input pins floating, even with weak pulldowns.

Thanks in advance

Kind regards, Samuel Lourenço