You do not have to use capacitive coupling. TI suggests capacitive coupling because the inputs of the AIC3254 are biased to CM so if you have a DC signal you'll want to make sure that the DC matches the CM.
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You do not have to use capacitive coupling. TI suggests capacitive coupling because the inputs of the AIC3254 are biased to CM so if you have a DC signal you'll want to make sure that the DC matches the CM.