ADA4938-2 problem


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 Den,

    Few questions on your circuit.

    What is you input voltage level? I need to know if the amplifier output is still in the specified output swing. With your current circuit, VCM=0.9V and output swing limited to + 3.8 V, the input should be between -4.7 V to +2.9 V.

    Also, 26ohms could cause an unbalanced termination for the inputs. I believe 27.4ohms is a standard value, you can use it instead.



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