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ADL5382 LO Leakage and Baseband Loading Clarification

Hello,

The ADL5382 datasheet states in multiple locations the LO to baseband leakage in terms of dBm. However, the baseband ports are not loaded in 50 Ohms. Can someone clarify what the roughly -40 dBm leakage figure means? How can I convert this figure to, say, LO voltage amplitude at the baseband ports?

If I treat it as an actual power measurement, I would do sqrt(10^((-40 - 30)/10) * 2 * 450) * 2 = 19mVp-p, which assumes a 450 Ohm baseband load. Is this the correct assumption? Or should 50 Ohms be used here?

Thanks