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AFE4404EVM: Inductor on the input

Harvey Wang4
Prodigy 120 points
Part Number: AFE4404EVM

Dear TI 

1. Why the EVM put an indutor(L1) on the  analog input?

    Will it not affect the frequency response?

2. The protection diodes(D3~D7) are for ESD or the feedback current of the LED

  • 0
    TI__Genius 12575 points

    Hi Harvey,

    L1 is the EVM is the common mode choke which is useful to suppress any high frequency common mode signal. It doesn't do anything to PPG signal.

    I would suggest checking the datasheet of L1 for the frequency response.

    D3 -D7 are for ESD.

    Regards,

    Prabin