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how to transform output signal to PD input current (adpd105 )


I want to use adpd105 with normal operation mode for measuring PPG.

But I don't understand how to transform output signal to PD input current.

This function is not for Nomal mode but for TIA ADC mode, is it?

(And I understand ADC_out means output signal (LSB). Is it correct?)

This might be basic question, but I look forward to your reply.