Input capacitor = 470pF, input has 23 ohms to ground as part of an attenuator. Changing these values has no effect.
The 0V number in the spec is an extrapolation of the linear region of the transfer function. In practice, at low input levels, the output voltage will go non linear. Some devices will have an offset voltage while the output voltage on others will prematurely collapse to 0V. There is a good plot in the ADL5501 datasheet (very similar part, probably better performance than AD8361) which illustrates this. You can see that below, about -25 dBm, the behavior of Vout varies a lot from device to device. Take a look at ADL5904 (www.analog.com/ADL5904). It also exhibits this behavior but it kicks in at a lower level and it's also more stable vs. temp at low input power levels (second plot below).
Thank you very much.
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