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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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  • Thanks for getting back to me. The problem with the LINN/RINN pins is that their input impedance changes significantly with PGA gain (from 2K to 84K, if I read the datasheet right), which means we need to use external buffers.  When you say “ground the LINP/RINP pins through a capacitor” that is different to the advice in the datasheet which says to connect these to CM (figure 33). Is grounding them through a capacitor preferable?

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  • Thanks for getting back to me. The problem with the LINN/RINN pins is that their input impedance changes significantly with PGA gain (from 2K to 84K, if I read the datasheet right), which means we need to use external buffers.  When you say “ground the LINP/RINP pins through a capacitor” that is different to the advice in the datasheet which says to connect these to CM (figure 33). Is grounding them through a capacitor preferable?

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