ADXL366 datasheet(69/71 Pages) AD

69 / 71 page

Data Sheet

ADXL366

APPLICATIONS INFORMATION

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Rev. 0 | 69 of 71

OPERATION AT VOLTAGES OTHER THAN 2.0V

The ADXL366 is tested and specified at a supply voltage of VS =

2.0V. However, the ADXL366 can be powered with a VS as high

as 3.6V or as low as 1.1V. Some performance parameters change

as the supply voltage changes, including the supply current (see

Figure 42), noise (see Table 10 and Table 2), offset, sensitivity, and

self test output change.

Figure 66 shows the potential effect on 0g offset at varying supply

voltages. Data for Figure 66 was calibrated to show 0mg offset at

2.0V.

Figure 66. 0 g Offset vs. VS

SENSITIVITY DEPENDENCY WITH ODR

The output sensitivity changes slightly with the ODR setting. Figure

67 shows the typical sensitivity change with the ODR for each axis

for 2g range.

Figure 67. Sensitivity Change vs. ODR Normalized to 100Hz ODR, 2g Range

SENSITIVITY DEPENDENCY WITH POWER

MODE

The output sensitivity changes slightly with the power mode setting.

For example, switching from normal operation mode to ultra-low

noise mode there is a ~2% sensitivity reduction, as shown in the

Figure 68.

Figure 68. Sensitivity vs. Power Mode, Normalized to Normal Operation Mode

MECHANICAL CONSIDERATIONS FOR

MOUNTING

Mount the ADXL366 on the PCB in a location close to a hard

mounting point of the PCB to the case. Mounting the ADXL366 at

an unsupported PCB location, as shown in Figure 69, can result

in large, apparent measurement errors due to undampened PCB

vibration. Locating the accelerometer near a hard mounting point

ensures that any PCB vibration at the accelerometer is greater than

the mechanical sensor resonant frequency of the accelerometer

and, therefore, effectively invisible to the accelerometer. Multiple

mounting points, close to the sensor, and/or a thicker PCB also help

to reduce the effect of system resonance on the performance of the

sensor.

Figure 69. Incorrectly Placed Accelerometers

ADXL366 Datasheet(PDF) 69 Page - Analog Devices

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