IDT typically recommends that the 8V97051 RF_OUT output loaded with a 50Ω pull up resistance and with an AC coupling capacitor in series. However, the 50Ω pull up resistance can also be replaced by a choke.
The inductive load does not provide a broadband loading scheme. It is only recommended for high frequencies (i.e >1GHz), but not recommended for lower frequencies where a high L value would be needed to keep a reasonable output power (Impedance ZL = 2*π*f*L).
However, the inductive loading has two main advantages: the output waveform is closer to a sine wave, and because every signal cycle, some energy is stored in the inductance, thus providing slightly optimized RF output power.
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