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ADXL337 Datasheet(Arkusz danych) 10 Page - Analog Devices

Numer części ADXL337
Szczegółowy opis  Small, Low Power, 3-Axis ±3 g
Pobierz  16 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXL337
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The ADXL337 is a complete 3-axis acceleration measurement
system. The ADXL337 has a measurement range of ±3 g minimum.
It contains a polysilicon surface micromachined sensor and signal
conditioning circuitry to implement an open-loop acceleration
measurement architecture. The output signals are analog voltages
that are proportional to acceleration. The accelerometer can
measure the static acceleration of gravity in tilt-sensing applications
as well as dynamic acceleration resulting from motion, shock,
or vibration.
The sensor is a polysilicon surface micromachined structure
built on top of a silicon wafer. Polysilicon springs suspend the
structure over the surface of the wafer and provide a resistance
against acceleration forces. Deflection of the structure is measured
using a differential capacitor that consists of independent fixed
plates and plates attached to the moving mass. The fixed plates
are driven by 180° out-of-phase square waves. Acceleration deflects
the moving mass and unbalances the differential capacitor resulting
in a sensor output whose amplitude is proportional to acceleration.
Phase-sensitive demodulation techniques are then used to
determine the magnitude and direction of the acceleration.
The demodulator output is amplified and brought off chip
through a 32 kΩ resistor. The user then sets the signal bandwidth
(BW) of the device by adding a capacitor. This filtering improves
measurement resolution and helps prevent aliasing.
MECHANICAL SENSOR
The ADXL337 uses a single structure for sensing the X, Y, and Z axes.
As a result, the three axes sense directions are highly orthogonal
with little cross-axis sensitivity. Mechanical misalignment of the
sensor die to the package is the chief source of cross-axis sensitivity.
Mechanical misalignment can be calibrated out at the system level.
PERFORMANCE
Rather than using additional temperature compensation circuitry,
innovative design techniques ensure that high performance is built
into the ADXL337. As a result, there is neither quantization error
nor nonmonotonic behavior, and temperature hysteresis is very
low (typically less than 3 mg over the −25°C to +85°C temperature
range).




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