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ADAU1361 crosstalk

We are using an ADAU1361 with 2 single-ended microphone inputs, and have observed significant crosstalk between the channels. We connected the microphones to the LINP & RINP pins rather than the LINN/RINN pins as is suggested in the datasheet, and LINN/RINN are connected to CM.  Could this be the cause of the crosstalk problem?

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