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Observer digieng
Observer
10,635 Views
Registered: ‎02-26-2016

Artix 7 Power Isolation

I have not been able to find information as to which power supplies appart from VCCAUX, need to be isolated on the Artix 7.

 

Is it necessary to isolate VVCINT and VVCBRAM with a ferrite bead or inductor? What is best practice?

 

Is it also neccessary to isolate VCCO_## power supplies with a ferrite bead or inductor? Again what is best practice?

 

Are LDO's preffered over DC/DC converters for the MGTAVCC and the MGTAVTT power supplies? Will the LDO provide sufficent isolation from the noise generated from the FPGA's digital switching?

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Xilinx Employee
Xilinx Employee
10,486 Views
Registered: ‎08-01-2012

Re: Artix 7 Power Isolation

If VCCINT and VCCBRAM are operating at the same voltage, VCCINT and VCCBRAM should be connected to the same supply. This was mentioned in Foot note 3 of Table-2 in http://www.xilinx.com/support/documentation/data_sheets/ds181_Artix_7_Data_Sheet.pdf

 

I do not think ferrite bead/ inductor is mandatory requirement in this case (where VCCINT and VCCBRAM are operating at the same voltage). Without ferrite bead / inductor also it works. We recommend to mount all decoupling capacitors as per PCB design user guide recommendations.

 

 

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