![]() ![]() Nonlinearity of Analog Devices accelerometers is low enough that it can most often be ignored. Nonlinearity is a measurement of deviation from a perfectly constant sensitivity, specified as a percentage with respect to either full-scale range (%FSR) or ± full scale (%FS). Ideally, the relationship between voltage and acceleration is linear and described by the sensitivity of the device. Graph is for illustration purposes only and does not show real accelerometer data. (illustrated in black) from a perfectly linear response (in gray). Nonlinearity is a measurement of the deviation of an accelerometer Temperature effects are caused by a combination of mechanical stresses and circuit temperature coefficients.įigure 1. Sensitivity change due to Temperature is generally specified as a % change per ☌. For analog-output sensors, sensitivity is ratiometric to supply voltage doubling the supply, for example, doubles the sensitivity. It is usually specified in a range (min, typ, max) or as a typical figure and % deviation. Sensitivity is specified at a particular supply voltage and is typically expressed in units of mV/ g for analog-output accelerometers, LSB/ g, or mg/LSB for digital-output accelerometers. This defines the ideal, straight-line relationship between acceleration and output (Figure 1, gray line). ![]() ![]() The ratio of change in acceleration (input) to change in the output signal. A 4g acceleration will not break a ☓ g accelerometer. Note that the breaking point is specified by the Absolute Maximum Acceleration, NOT by the measurement range. If it is accelerated at 4 g, the output may rail. For example, the output of a ☓ g accelerometer is linear with acceleration up to ☓ g. This is the greatest amount of acceleration the part can measure and accurately represent as an output. The level of acceleration supported by the sensor’s output signal specifications, typically specified in ± g. ![]()
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