LMX2594: LMX2594 with sinus clock input

Dan Gani

Prodigy 80 points

Part Number: LMX2594

to reduce clock spurs i want to use sinus input to LMX2594.

1. what will be the phase noise degradation in this case?

2. what input level should be used?

3. what will be the preferred clock frequency range at this case?

thank you for your help

Dan

over 9 years ago

0 Dean Banerjee over 9 years ago

TI__Mastermind 28031 points

Dan,

In general, best phase noise is for highest slew rate. As for spurs, they are best for higher slew rate, but are a little better for lower amplitude, like an LVDS signal.

If using a sinusoidal waveform, the highest frequency and highest amplitude typically is best because it has a higher slew rate.

Regards,
Dean

0 Dan Gani over 9 years ago in reply to Dean Banerjee

Prodigy 80 points

Thank you Dean for your reply

Sorry for not explaining well

The spurs I am concern about are clock harmonics resulting in distributing square wave clock in long lines

I was hopping too get more numbers about the phase noise degradation of sinus wave input to LMX2594

I will therefore distribute the clock in sinus waveform and then use sinus to LVDS converter close to the PLL.

Have a wonderful day

Dan

Clock & timing

Clock & timing forum

LMX2594: LMX2594 with sinus clock input