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AFE4950EVM: SpO2 calculation

Part Number: AFE4950EVM
Other Parts Discussed in Thread: AFE4950

Hello,

I'm trying to calculate the SpO2 based on the signal from AFE4950.

My main idea is that get two TIA output signal setting green LED and red LED in different PPG phase.

Than SpO2 can be calculated based on IAC/IDC and the absorption coefficient of red and green light respectively.

But the result is quite wrong.

Is there any data or method to help to calculate SpO2 officially?

Red and Green PPG waveform