LMX2594: single ended RF clock power Range

Meir Einot

Part Number: LMX2594

I`m using 100MHz with RF 50ohm amplifier single ended for the REF clock (OCSinP ) with 1nF ac coupled capacitor (without 50 shunt resistor) ~6dBm.
for the OSCinN I put 1nF with 50 ohm in series to the GND.

Please advise for best noise performance what is the recommended input power range (in dBm )

Do you recommend to apply saturated RF signal or it can be pure sine .

Thanks

Meir

over 5 years ago

0 Liam Keese over 5 years ago

TI__Genius 12705 points

Hello,

Faster edges are preferred , clilpped sine or saturated will provide faster transitions on the input buffer.

The input level also is dependent on the input edge rate, a sine wave you would need higher power to acheive similar noise transfer performance.

I would recommend to keep input level > +3 dBm for best phase noise performance.

Regards,

0 Noel Fung over 5 years ago in reply to Liam Keese

TI__Guru** 108130 points

Hi Meir,

If your RF amplifier requires a 50Ω termination, you need to put a 50Ω shunt in OSCinP pin (requires AC coupling)

At 100MHz, 3dBm sine wave is good enough. You may not get much slew rate improvement with clipped sine or saturated at this frequency.

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LMX2594: single ended RF clock power Range