MA800 – 8-BIT, DIGITAL ANGLE SENSOR

MA800 Rev. 1.02

www.MonolithicPower.com

22

6/15/2018

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APPENDIX A: DEFINITIONS

Resolution (3σ noise level)

Smallest angle increment distinguishable from the noise. The

resolution is measured by computing three times

σ (the standard

deviation in degrees) taken over 1,000 data points at a constant

position. The resolution in bits is obtained with log2(360/6σ).

Refresh Rate

Rate at which new data points are stored in the output buffer.

Latency

Time elapsed between the instant when the data is ready to be read

and the instant at which the shaft passes that position. The lag in

degrees is

v

lantency

lag





, where

v is the angular velocity in deg/s.

Power-Up Time

Time until the sensor delivers valid data starting at power-up.

Integral Non-Linearity (INL)

Maximum deviation between the average sensor output (at a fixed

position) and the true mechanical angle.

Figure A1: Integral Non-Linearity

Drift

Angle

variation

rate

when

one

parameter

is

changed

(e.g.:

temperature, VDD) and all the others, including the shaft angle, are

maintained constant.