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Visitor
Visitor
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Registered: ‎09-21-2019

User GPIO KC705 output swing

Hi there,

 

I'm trying to bring out a couple of user-generated single-ended signals to the user GPIO SMA connectors on a KC705 board. I am setting the pins to LVCMOS18 however I'm only getting ~700mV voltage swing at the output and it looks very capacitive (1.8V is the minimum requirement for my design).

How can I get a square wave with a maximum swing out of the GPIO connectors? attached is the scope capture of the waveforms

 

Mandana

axi_GPIO.PNG
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Community Manager
Community Manager
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Registered: ‎08-08-2007

Re: User GPIO KC705 output swing

Hi @mkhazrai 

 

How are you driving that output? Are you using an OFD or ODDR or the like?

What load do you have on the SMA? If its just the scope what termination are you using on the scope?

 

Sandy

Thanks,
Sandy

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