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TMDS181: How to deal with SPDIF_IN pin when ARC is unused

Part Number: TMDS181

Hi team,

How does customer deal with SPDIF_IN pin when ARC is unused? 

Typical application in the datasheet (9.2.1 Source Side Application ) suggest 500k ohm pull-down. If this pin is floating, is there any problems?

Best regards,

Hayashi