Why is the differential impedance of RFIP/M and RFOP/M of AD8340 50 Ω nominal?

Why is the differential impedance of RFIP/M and RFOP/M of AD8340 50 Ω nominal? Usually, the differential impedance of the most RF devices is 100 ohm. If AD8340 RFI and RFO are connected to these devices, how to match the differential impedance? Is there any application note for this available?

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