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TPA3245: Recommended cable of clock signals in multiple-device configuration

Part Number: TPA3245

Hi,

Our customers want to use multiple TPA3245s mounted by one on one board in an application that requires multi-channel amplifiers.
He plans two clock signals OSC_IOP and OSC_IOM will be connected between each boards.
Which of the following (A) to (C) cable is the best to connect clock signals between boards?

(A) shielded two clock signals together.
(B) shielded twisted pair cable.
(C) cables shielded one by one.

Best regards,

Akio Ito