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LMX8410L: LO_M & LO_P pin biasing for external LO input.

Prodigy 10 points

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Part Number: LMX8410L

Datasheet pin description & 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."

Please clarify...