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AFE4490SPO2EVM: About the Frenquency of signal and noise

Part Number: AFE4490SPO2EVM
Other Parts Discussed in Thread: AFE4490

Hi Team,

1) The SNR tested in AFE4490, regarding the calculation of SNR, it is necessary to know the voltage value of the noise and the signal, how is the frequency range of the noise and the signal determined, and what are they? Regarding the SNR calculation part, how are VFS_Signal and VRMS_Noise calculated? 

2) Also it's find that the board cannot be connected to the GUI interface. The GUI keeps prompting me that the board is not connected, but the board indicator light is on. 

Could you please help take a look at this case? Thanks.

Best Regards,


  • Hi,

    Apology for delay.

    I will get back to you around/before 8/24


  • Hi,

    May I know which customer is asking? If not allowed to disclosed, please convert this to INTERNAL or send me an email.


    Which/What SNR is customer referring to?

    And, what VFS_Signal and VRMS_Noise does customer refer to?


    Regarding to EVM GUI-

    Does customer download and install the GUI from

    SLAC556  AFE44x0SPO2EVM GUI v2.4

    Make sure -

    0. Use a different computer with Windows 10.

    1.  DO NOT connect EVM to PC before GUI installation completes.

    2. TI recommends having administrator rights to avoid problems during installation

    I tried install on my computer or uninstall and reinstall in my computer, the GUI can connect and Read/Write registers without problem -