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SRC4392: SRC4392 circuit desing info

Part Number: SRC4392

Hi everybody,
I'm implementing a project that include the SRC4392.
Due to pcb space limitation I need to use less components as possible.
I have a doubt about the RX+/RX- (pins 1 to 8) that are not utilized in my project (I'm using only I2S port A,B and AESOUT), can I leave these pins float or i must to connect they to gnd (through capacitors, due to DC bias)?
I can't find related information in the datasheet about this specific aspect.
Many thanks.
Luca