LMX2694-SEP: What is the phase noise degradation of the VCXO signal if I have a circuit using this part feeding into LMK04832?

Lauren Mayfield

Expert 7635 points

Part Number: LMX2694-SEP
Other Parts Discussed in Thread: LMK04832,

Tool/software:

Say in certain dB per frequency offset levels.

Let me know if this question makes sense.

Thanks,
Lauren

3 months ago

0 Derek Payne 3 months ago

TI__Mastermind 31880 points

Can you provide a diagram with the relationship between the LMX2694-SEP, LMK04832, and VCXO elaborated? Without seeing the signal path, it's not clear at which point you're asking about the potential for phase noise degradation.

0 Lauren Mayfield 3 months ago in reply to Derek Payne

TI__Expert 7635 points

I can't because it's ITAR restricted. I will email you about this.

+1 Derek Payne 3 months ago in reply to Lauren Mayfield

TI__Mastermind 31880 points

We eventually resolved this outside of E2E - in summary, enabling PLL2 does result in phase noise degradation relative to just the VCXO (since the additive noise of the PLL and internal VCO are applied); and I provided instructions to simulate their chosen topology in PLLatinum Sim.

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LMX2694-SEP: What is the phase noise degradation of the VCXO signal if I have a circuit using this part feeding into LMK04832?