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ADXRS646 Datasheet(Arkusz danych) 11 Page - Analog Devices

Numer części ADXRS646
Szczegółowy opis  High Stability, Low Noise Vibration Rejecting Yaw Rate Gyro
Pobierz  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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Data Sheet
ADXRS646
Rev. 0 | Page 11 of 12
IMMUNITY TO VIBRATION
Gyroscopes are designed to respond only to rotation. However,
all gyroscopes respond to linear motion as well, to varying
degrees. While bias stability is often used as the primary figure
of merit for evaluating high performance gyroscopes, many
additional error sources are present in real-world applications.
Especially in applications that require motion sensors, vibration
and acceleration are present, and the resulting errors often
overwhelm bias drift.
Its differential, quad-sensor design makes the ADXRS646
inherently resistant to vibration, without the need for
compensation. The excellent vibration immunity of the
ADXRS646 is demonstrated in Figure 21 and Figure 22.
Figure 21 shows the ADXRS646 output response with and
without random 15 g rms vibration applied at 20 Hz to 2 kHz.
Performance is similar regardless of the direction of input
vibration.
Figure 21. ADXRS646 Output Response With and Without Random Vibration
(15 g RMS, 20 Hz to 2 kHz); Gyroscope Bandwidth Set to 1600 Hz
To further improve immunity to vibration and acceleration,
some g-sensitivity compensation can be performed using an
accelerometer. This technique is most successful when the
response to vibration is constant regardless of vibration
frequency. Figure 22 demonstrates the ADXRS646 dc bias
response to a 5 g sinusoidal vibration over the 20 Hz to 5 kHz
range. This figure shows that there are no sensitive frequencies
present and that vibration rectification is vanishingly small.
Accordingly, g-sensitivity compensation using an accelerometer
is possible where needed, but the inherent device performance
is sufficient for many applications.
Figure 22. ADXRS646 Sine Vibration Output Response (5 g, 20 Hz to 5 kHz);
Gyroscope Bandwidth Set to 1600 Hz
1
0.1
0.01
0.001
0.0001
0.00001
FREQUENCY (Hz)
10
100
1k
10k
WITH VIBRATION
NO VIBRATION
0.12
–0.04
–0.02
0
0.02
0.04
0.06
0.08
0.10
FREQUENCY (Hz)
10
100
1k
10k




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