ADXL357BEZ Просмотр технического описания (PDF) - Analog Devices

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ADXL357BEZ

Low Noise, Low Drift, Low Power, 3-Axis MEMS Accelerometers

Analog Devices 

Data Sheet

THEORY OF OPERATION

The ADXL356 is a complete 3-axis, ultralow noise and ultrastable

offset microelectromechanical systems (MEMS) accelerometer

with outputs ratiometric to the analog 1.8 V supply, V1P8ANA. The

ADXL357 adds three high resolution ADCs that use the analog

1.8 V supply as a reference to provide digital outputs insensitive

to the supply voltage. The ADXL356B is pin selectable for ±10 g

or ±20 g full scale, the ADXL356C is pin selectable for ±10 g or

±40 g full scale, and the ADXL357 is programmable for ±10 g,

±20 g, or ±40 g full scale. The ADXL357 offers both SPI and I2C

communications ports.

The micromachined, sensing elements are fully differential,

comprising the lateral x-axis and y-axis sensors and the vertical,

teeter totter z-axis sensors. The x-axis and y-axis sensors and

the z-axis sensors go through separate signal paths that minimize

ADXL356/ADXL357

offset drift and noise. The signal path is fully differential, except

for a differential to single-ended conversion at the analog

outputs of the ADXL356.

The analog accelerometer outputs of the ADXL356 are ratiometric

to V1P8ANA. Therefore, digitize them carefully. The temperature

sensor output is not ratiometric. The XOUT, YOUT, and ZOUT analog

outputs are filtered internally with an antialiasing filter. These

analog outputs also have an internal 32 kΩ series resistor that

can be used with an external capacitor to set the bandwidth of

the output.

The ADXL357 includes antialias filters before and after the high

resolution Σ-Δ ADC. User-selectable output data rates and filter

corners are provided. The temperature sensor is digitized with a

12-bit successive approximation register (SAR) ADC.

Rev. A | Page 21 of 42

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