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Visitor
Visitor
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Registered: ‎02-09-2010

Specs for ADC/DAC clocks in RFSoC

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Where do I find the input specifications (voltage levels) for ADC_CLK and DAC_CLK?  DS926 does not seem to call these out.

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Moderator
Moderator
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Registered: ‎04-18-2011

The clock input should be AC coupled and provide a input that is between 0.9V and 1.8V pk-pk

this is called out in the data sheet. 

I would also encourage a proper simulation with the s-parameter models to ensure that the 0dBm input power requirement is met. 

Also you can sometimes get standing wave conditions (depending on the clock frequency and PCB length) which can lower the expected input power below the required level. Extraction & Simulation will highlight this issue and if changes are required. 

 

 

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Moderator
Moderator
652 Views
Registered: ‎04-18-2011

The clock input should be AC coupled and provide a input that is between 0.9V and 1.8V pk-pk

this is called out in the data sheet. 

I would also encourage a proper simulation with the s-parameter models to ensure that the 0dBm input power requirement is met. 

Also you can sometimes get standing wave conditions (depending on the clock frequency and PCB length) which can lower the expected input power below the required level. Extraction & Simulation will highlight this issue and if changes are required. 

 

 

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Don’t forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------

View solution in original post

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Visitor
Visitor
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Registered: ‎06-04-2018

For what it's worth, I could not find this information anywhere in DS926. Maybe you should include it in the next update?

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