ad22304 Analog Devices, Inc., ad22304 Datasheet - Page 11

• Manufacturer Part Number: ad22304
• Description: ?80?/s Single Chip Yaw Rate Gyro With Signal Conditioning
• Manufacturer: Analog Devices, Inc.

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 10 to Figure 15 for the various
sensor axes. The in-band effect can be seen in Figure 25. This
is the result of the static g-sensitivity. The specimen used for
Figure 25 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 24 and Figure 26.
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 27.
Figure 25. Random Vibration (Lateral) 2 Hz to 40 Hz, 3.2 g rms
2.50
2.60
2.50
2.60
2.56
2.52
2.58
2.56
2.54
2.52
2.58
2.54
at 0.01 g/—Hz with 60 Hz Sampling and 0.5 sec Averaging
Figure 24. Random Vibration (Lateral) 10 kHz to 20 kHz
0
0
2
2
4
4
TIME (sec)
TIME (sec)
6
6
8
8
10
10
Rev. C | Page 11 of 12
–130
–110
–120
–100
2.60
2.52
2.50
2.58
2.56
2.54
Figure 27. Noise Spectral Density at RATEOUT –BW = 4 Hz
–60
–80
–70
–90
at 0.01 g/—Hz with 60 Hz Sampling and 0.5 sec Averaging
Figure 26. Random Vibration (Lateral) 10 kHz to 20 kHz
0
0
10
2
STATIC 0.8mV rms
SHAKING 2.4mV rms
FREQUENCY (Hz)
100
4
TIME (sec)
1000
6
AD22304
10000
8
100000
10