ADA4938-2 problem

Hi,

I have a confusing problem with ADA4938-2. I connected ADA with unity gain and dual supply to AD9253. Vocm is provided by ADC. Schematic and parts values seem to be correct but output of ADA is very noisy. Any suggestion??

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  • Hi Denkins,

    Thank you for your interest in ADA4938 and AD9253. I'm sorry but I cannot see the schematic clearly. Would you please confirm what the ADA4938 supply voltages are?

    I believe Jino's point is that, depending on the amplifier supply voltages, the ADA4938 might not be able to support an output VCM = 0.9V even if 0.9V is applied to the VOCM pin.

    Thank you.

    Doug

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