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PCM4204: Question regarding unused channels

Part Number: PCM4204

My customer will only use channels 1 and 2 on a PCM4204 in their design. The Channel 3 and 4 are not used. Can we leave Vin3+, Vin3-, Vin4+, Vin4-, and SDOUT2 unconnected? How about Vref34+, Vref34-, Vcom34, AGND3?

Thanks,

Brian