LMX2594: Phase noise versus sinusoidal OSCin power

AJK

Part Number: LMX2594
Other Parts Discussed in Thread: LMX2615-SP

For LMX2594, VOSCin is specified to be between 0.2 and 2 Vpp. When using a sinusoidal signal reference clock, does using higher power result in lower phase noise because of higher slew rate?

over 2 years ago

+1 Dean Banerjee over 2 years ago

TI__Mastermind 28001 points

Yes, indeed it does. We don't have this graph for the LMX2594, but we do for the LMX2615-SP. They are different parts, but the input buffer is similar and I would expect similar results. Untimately, it is the slew rate that matters, that depends on the input frequency and frequency of the sine wave:

Regards,

Dean

0 AJK over 2 years ago in reply to Dean Banerjee

Prodigy 10 points

Thank you for your reply.

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LMX2594: Phase noise versus sinusoidal OSCin power