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LMX2592: Required slew rate for 10MHz reference signal

Part Number: LMX2592

Hi,

I'm planning to use LMX2592 for the signal generation of 20-6000MHz required for BITE with reference signal of 10MHz sine wave from OCXO ( Zo=50 ohms).

Is there any requirement for slew rate at 10MHz to use as  reference?

As per datasheet reference REFin can from 5 to 1400MHz but not mentioned any slew rate requirement.

What will be the performance impact with 10MHz Sine wave reference input in LMX2592?

Regards,

Kanchana R

  • Hi Kanchana,

    With 10MHz sine wave, the slew rate is bad, PLL noise will degrade significantly. In general, you want at least 600 V/us for the best possible figure of merit.

    In addition, if you want to generate 6000MHz from a 10MHz clock, the N-divider value will be big, as a result, PLL noise is not going to be good.