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LMP91051: waveform issue

Part Number: LMP91051

Dear Sir/Madam ,

We are working on HTS E21 thermopile sensor with using IR lamo HSL5-115.

I configure below setting.

Lamp Pulse Frequency: 2 Hz( 250ms on and 250ms Off )
System Gain: 2000 V/V( 250 , 8 gain setting in device configure)
System Offset: Apx. -700mV
Input Channel Mux Toggle Frequency: 100hz (after every 10ms switch input mux)

After doing this setting I found below waveform output at out pin.

why this waveform not matched with your reference waveform.?