DRV5055-Q1: sensing voltage level is affected by rotation speed

Part Number: DRV5055-Q1

HI,

We select DRV5055A3 to sense a ring magnet with 2-pole. Two sensor are putted away from 90 degree around the ring magnet. Therefore, we can get sine wave and cosine wave properly.

However, the peak of wave is variable with the rotation speed. Lower Vp-p is appear in higher rotation speed (1000 rpm), and high Vp-p is appear in lower rotation speed (100 rpm).

I do not know how to explain this phenomenon?

thanks.