What is the input impedance of the ADRF5026 SPDT switch at the RFC port when both RF1 and RF2 paths are set to the Isolation (Off) state?

Question

Accepted Answer

When EN is high (all channels off), looking into RF1 and RF2 you see two separate 50 ohm resistors. So any power going into RF1 and RF2 will dissipate inside the part in those two resistors. The absolute max ratings say that this power level should not be greater than 25 dBm into each pin. When EN is high, the RFC port is not internally terminated and looks like an open. So any power applied to the RFC input will reflect and come back out of the part, that is, it will not dissipate inside the part.

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ADRF5026 : FAQ