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ADV7619 output impedance for series termination

Question asked by fpga77 on Feb 13, 2015
Latest reply on Feb 13, 2015 by GuenterL

I would like to fit the right value series termination, Rs, on the ADV7619 data bus.

 

The track impedance, Zo, will be around 50 ohm on my PCB.

To get the right Rs I need  Rdriver + Rs = Zo.

But what is the Rdriver for these outputs, P0 - P47 ?

My guess is 20 - 30 ohm, so fitting Rs=22R will give  fair match, but what is the value?

The ADV7619 eval board schematic shows 75R, possibly to match to a 75 or 100 ohm track, it's not clear.

 

I also will use Rs on the VS/HS/DE and LLC/CLK outputs too, are they the same Rdriver?

Does the software setting of driver output  strength affect the R driver in any way?

 

Thanks

 

FPGA77

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