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ADXRS290 Datasheet(Arkusz danych) 10 Page - Analog Devices

Numer części ADXRS290
Szczegółowy opis  Ultralow Noise, Dual-Axis MEMS Gyroscope
Pobierz  19 Pages
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Producent  AD [Analog Devices]
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Data Sheet
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.
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
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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