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ADXRS290BCEZ-RL7 数据表(PDF) 10 Page - Analog Devices |
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ADXRS290BCEZ-RL7 数据表(HTML) 10 Page - Analog Devices |
10 / 19 page ADXRS290 Data Sheet THEORY OF OPERATION The ADXRS290 is designed to sense x-axis and y-axis (roll and pitch) angular rate. The ADXRS290 operates on the principle of a vibratory rate gyroscope. Figure 23 presents a simplified illustration of one of four, coupled polysilicon sensing structures. Each sensing structure contains a resonating disk that is electrostatically driven to resonance, which produces the necessary rotating velocity element needed to generate a Coriolis torque when experiencing angular rate. ΩY ΩX Y-AXIS X-AXIS Figure 23. Simplified Gyroscope Sensing Structure When the sensing structure is exposed to an angular rate, the resulting Coriolis torque drives each of the disks into a tilting motion, which is sensed by plates under the disk. The disk and plate form a capacitive pickoff structure that senses angular rate. The resulting signal is fed to a series of gain and demodulation stages that produce the electrical rate signal output. The sensor design rejects linear and angular acceleration because external g-forces appear as common-mode signals that are removed by the fully differential architecture of the ADXRS290. The resonator requires 31 V (typical) for operation. Because only 5 V is typically available in most applications, a switching regulator is included on-chip. An external 1 µF capacitor rated for 50 V is required for proper operation of the charge pump circuit. After demodulation and analog-to-digital conversion, the rate signal is filtered using a single-pole band-pass filter. The high- pass and low-pass poles of this filter are programmable via the digital interface. Rev. A | Page 10 of 19 |
类似零件编号 - ADXRS290BCEZ-RL7 |
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类似说明 - ADXRS290BCEZ-RL7 |
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