ADA4622-1 to replace TI OPA171 issue


           Below is customer schematics and ADA4622-1 & TI OPA171 test waveform. The pin3 input signal is DC signal . Why noise is much higher of ADA4622-1 than TI OPA171? It is directly replace OPA171 on the same board for testing. But ADA4622-1 has poor signal on output.  Thank you. 



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[edited by: PChen833 at 8:13 AM (GMT -4) on 12 Aug 2021]
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    •  Analog Employees 
    on Aug 31, 2021 8:17 AM

    Hi PChen833,

    Apologies for the late response. Could you provide more information about this? For example how does the customer's setup look like, is the snip of the schematic above just a part of a larger schematic, is this part on the front end of the schematic, what equipment did the customer use on the setup and obtaining the data. Also if its not too much to ask, may I know the application for this?