Connecting Digital output of a sensor to Analog input.

I have connected the digital output of the PNP type sensor to Analog input in Single-ended mode. I am getting a Square wave. 

Expected: Ideal case 0v should be obtained. When an obstacle crosses the sensor 10 V signal should come. 

Actual     : Pulse waveform is obtained ideal condition and 10 V signal is obtained when the obstacle cross the sensor

Please help me to resolve the issue.

Thanks,

Anbarasan.