That is a digital Hall effect sensor, so you should be reading it with a digital pin.
Did you read the note in the link, stating that two magnets are required?
Output toggles when a north followed by south pole of a magnet are nearby. Note: Requires both a north and south pole to function. If mounting on a wheel, you will mount 2 magnets on the wheel diametrically opposite from each other so that the north and south pole both pass the sensor and toggle the input high and low.