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ADXL377 Datenblatt(PDF) 7 Page - Analog Devices |
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ADXL377 Datenblatt(HTML) 7 Page - Analog Devices |
7 / 13 page Preliminary Technical Data ADXL377 Rev. PrB | Page 7 of 13 THEORY OF OPERATION The ADXL377 is a complete 3-axis acceleration measurement system. The ADXL377 has a measurement range of ±200 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 accelerometer is designed to measure dynamic acceleration resulting from high impact events without output saturation. 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 ADXL377 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 ADXL377. As a result, there is neither quantization error nor nonmonotonic behavior, and temperature hysteresis is very low (typically less than 30 mg over the −25°C to +85°C temperature range). |
Ähnliche Teilenummer - ADXL377 |
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Ähnliche Beschreibung - ADXL377 |
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