[AD9287eval board] how to change input drive for DC signal?

Hello,

The customer is using AD9287 EVM.

They would like to measure the signal that mixed DC. But EVM has capacitor for rejecting DC.

Is there any way to modify EVM input stage for accept DC level signal?

Thank you for your help as always.

Best regards,

Sofy

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  • 0
    •  Analog Employees 
    on Apr 8, 2016 12:21 AM

    Hi Sofy,

    To pass a DC signal to the ADC, the DC blocking capacitors can be replaced with a 0Ohm resistors. You will also need to remove the transformer and short across its pads on the board. Depending on what you are trying to do, you could remove the shunt resistors also. Now there will be a DC path to the ADC inputs.

    Please keep in mind you will now need to manage the input common mode voltage so that it matches the requirements of the AD9287.

    Is this a differential signal?

    Thank you.

    Doug

Reply
  • 0
    •  Analog Employees 
    on Apr 8, 2016 12:21 AM

    Hi Sofy,

    To pass a DC signal to the ADC, the DC blocking capacitors can be replaced with a 0Ohm resistors. You will also need to remove the transformer and short across its pads on the board. Depending on what you are trying to do, you could remove the shunt resistors also. Now there will be a DC path to the ADC inputs.

    Please keep in mind you will now need to manage the input common mode voltage so that it matches the requirements of the AD9287.

    Is this a differential signal?

    Thank you.

    Doug

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