Part Number: LMX8410L
Datasheet pin description & 188.8.131.52.2.2 LO Interface as Input Port:, both state no pullups required for use as input.
But 10.1.1 High Frequency Trace Routing: states " Use 50-Ω pullup resistors to VCC_BUF to bias these pins as inputs, if driven through external capacitors."
Pin description and section 7 are correct. When the LO is used as input, no external pull-up is required.
Section 10 is wrong. I have document this and will fix it in next revision. Thanks for pointing this out.
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