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ADXRS150ABG Datasheet(Arkusz danych) 10 Page - Analog Devices

Numer części ADXRS150ABG
Szczegółowy opis  ±150°/s Single Chip Yaw Rate Gyro with Signal Conditioning
Pobierz  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXRS150
Rev. A | Page 10 of 12
sensing rate. Application notes outlining continuous self-test
techniques are also available on the Analog Devices website.
Acceleration Sensitivity
The sign convention used is that lateral acceleration is positive
in the direction from Pin Column A to Pin Column G of the
package. That is, a device has positive sensitivity if its voltage
output increases when the row of Pins 2A–6A are tipped under
the row of Pins 2G–6G in the earth’s gravity.
There are two effects of concern, shifts in the static null and
induced null noise. Scale factor is not significantly affected until
the acceleration reaches several hundred m/s2.
Vibration rectification for frequencies up to 20 kHz is on the
order of 0.00002(°/s)/(m/s2)2, is not significantly dependent on
frequency, and has been verified up to 400 m/s2 rms.
Linear vibration spectral density near the 14 kHz sensor reso-
nance translates into output noise. In order to have a significant
effect, the vibration must be within the angular rate bandwidth
(typically ±40 Hz of the resonance), so it takes considerable
high frequency vibration to have any effect.
Away from the 14 kHz resonance the effect is not discernible,
except for vibration frequencies within the angular rate pass
band. This can be seen in Figure 9 to Figure 14 for the various
sensor axes. The in-band effect can be seen in Figure 24. This is
the result of the static g-sensitivity. The specimen used for
Figure 24 had a g-sensitivity of 0.15°/s/g and its total in-band
noise degraded from 3 mV rms to 5 mV rms for the specified
vibration. The effect of broadband vibration up to 20 kHz is
shown in Figure 23 and Figure 25.
The output noise of the part falls away in accordance with the
output low-pass filter and does not contain any “spikes” greater
than 1% of the low frequency noise. A typical noise spectrum is
shown in Figure 26.
TIME – Seconds
2.50
2.52
2.54
2.56
0
24
6
8
10
2.58
2.60
Figure 23. Random Vibration (Lateral) 10 kHz to 20 kHz
at 0.01 g/
√Hz with 60 Hz Sampling and 0.5 Sec Averaging
TIME – Seconds
2.50
2.52
2.54
2.56
0
24
6
8
10
2.58
2.60
Figure 24. Random Vibration (Lateral) 2 Hz to 40 Hz, 3.2 g rms
TIME – Seconds
2.50
2.52
2.54
2.56
0
24
6
8
10
2.58
2.60
STATIC 0.8mV rms
SHAKING 2.4mV rms
Figure 25. Random Vibration (Lateral) 10 kHz to 20 kHz
at 0.01 g/
√Hz with 60 Hz Sampling and 0.5 Sec Averaging
FREQUENCY – Hz
–130
–110
–120
–100
–90
0
10
100
1000
10000
100000
–80
–70
–60
Figure 26. Noise Spectral Density at RATEOUT –BW = 4Hz




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