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ADC12DJ5200RF: Grounding Issue

Part Number: ADC12DJ5200RF

HI TI Team,

 We are working with ADC12DJ5200RF ADC in our Design. Where we are using a common Analog & Digital GND & we are isolating the Chassis Ground using RC Filter.  As per our Requirement we need to have a separate Chassis GND.

We are using this board in 3U VPX LRU. Where the ADC input is taken from the External using a BNC Connector as a panel mount & BNC to SMA Cable for connectivity to board from LRU Front panel.

Now because of this connection my Board GND (DGND & AGND) is getting shorted with Chassis GND.

Can you please suggest how i can use a GND isolator in my design from SMA to ADC input.