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ADXRS290BCEZ Datasheet(Arkusz danych) 10 Page - Analog Devices

Numer części ADXRS290BCEZ
Szczegółowy opis  Ultralow Noise, Dual-Axis MEMS Gyroscope
Pobierz  19 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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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




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