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Original question:

LMX2582: Differential to single ended operation

LMX2582: LMX2582

Debasis Panda
Prodigy 10 points
Part Number: LMX2582

Hello

In my design, LMX2582 clock synthesizer is connected to ADCLK944 device from Analog Devices. Output of LMX2582 is configured for differential clock mode and differential impedance on PCB is 100ohm. All circuit is as per reference design for LMX2582.

I am using Hyperlynx SI analysis tool to check post layout clock quality at ADCLK944. The quality of clock is very bad. Tried by isolating ADCLK944 device also, but no improvement in result.

What might cause LMX2582 to not generate proper clock, event though schematics design is same as reference design and using IBIS model available on TI website ? Need quick help as I am about to release design soon.

Regards

Debasis

  • 0
    TI__Guru** 107530 points

    Hi Debasis,

    The IBIS model is not intended for RF signal integrity check, it is mostly used for SPI interface and other logic IOs simulation. Currently we don't have any other RF modelings for the RF output ports.

    Our recommendation for good layout:

    - place the 50Ω pull-up as close to the pin as possible

    - use 0201 passive components