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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8V97051 Datasheet Datasheet PDF 1.12 MB
8V97051 Low-Power Wideband RF Synthesizer / PLL 日本語 Product Brief PDF 368 KB