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ADC LVDS Output bus

Question asked by YYHH on May 31, 2013
Latest reply on May 31, 2013 by J.Harris

Hi,

 

I'm going to use the AD9258 in my next design and I'm simulating the LVDS data bus connected to my FPGA.

 

I can see a pretty bad shape at the receiver die, while my diff line is close to 100 Ohms differential as is the receiver internal termination.

 

It seems the ADC LVDS pins show a pretty low output impendance: around 18 ohms. I think this should be the cause of the ringing seen on the curve attached.

 

Am I right? Why is this output impedance so low? How could I solve this problem without series resistors?

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