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LDC1101: Shape of the output signal from INA and INB

Part Number: LDC1101

Good morning,

my question is simple, but i don't know if the answer is the same.

Why in LDC1101 if I measure the voltage between INA and GND I obtain a semi-sinusoidal shape like in the figure below (and not a full complete sinusoidal shape) ?

Why is it convenient for the sensor to sense a semi-sinusoidal wave?

Thank for your help,

Lorenzo