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PDF AD22304 Data sheet ( Hoja de datos )
| Número de pieza | AD22304 | |
| Descripción | Single Chip Yaw Rate Gyro | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD22304 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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±80°/s Single Chip Yaw Rate
Gyro with Signal Conditioning
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
0.05°/s/√Hz noise
2000 g powered shock survivability
Self-test on digital command
Temperature sensor output
Precision voltage reference output
Absolute rate output for precision applications
5 V single-supply operation
Ultrasmall and light (< 0.15 cc, < 0.5 gram)
APPLICATIONS
GPS navigation systems
Vehicle stability control
Inertial measurement units
Guidance and control
Platform stabilization
AD22304
GENERAL DESCRIPTION
The AD22304 is a complete angular rate sensor (gyroscope)
that uses Analog Devices’ surface-micromachining process to
make a functionally complete and low cost angular rate sensor
integrated with all of the required electronics on one chip.
The manufacturing technique for this device is the same high
volume BIMOS process used for high reliability automotive
airbag accelerometers.
The output signal, RATEOUT (1B, 2A), is a voltage propor-
tional to the angular rate about the axis normal to the top sur-
face of the package (see Figure 2). A single external resistor
can be used to lower the scale factor. An external capacitor is
used to set the bandwidth. Other external capacitors are re-
quired for operation (see Figure 22).
A precision reference and a temperature output are also pro-
vided for compensation techniques. Two digital self-test inputs
electromechanically excite the sensor to test the operation of
both sensors and the signal conditioning circuits. The AD22304
is available in a 7 mm × 7 mm × 3 mm BGA surface-mount
package.
ST1 5G
ST2 4G
FUNCTIONAL BLOCK DIAGRAM
AVCC
3A
+ 5V –
100nF
AGND
2G 1F
100nF
CMID
1D
COUT
SUMJ
1C
SELF
TEST
RATE
SENSOR
CORIOLIS SIGNAL CHANNEL
π DEMOD
RSEN1
RSEN2
≈9kΩ ±35% ≈9kΩ ±35%
RESONATOR LOOP
ROUT
180kΩ 1%
1B
RATEOUT
2A
2.5V REF
1E 2.5V
CHARGE PUMP/REG.
12V
PTAT
3G TEMP
ADAXDR2S213504
PDD
4A 5A
7E
CP2 CP1
22nF
6G 7F
PGND
100nF
Figure 1.
6A 7B 7C
CP4 CP3
22nF
7D
CP5
47nF
Rev. 0-Preliminary
Information furnished by Analog Devices is believed to be accurate and reli-
able. However, no responsibility is assumed by Analog Devices for its use, nor
for any infringements of patents or other rights of third parties that may result
from its use. Specifications subject to change without notice. No license is
granted by implication or otherwise under any patent or patent rights of Ana-
log Devices. Trademarks and registered trademarks are the property of their
respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,
U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
Free Datasheet http://www.datasheet4u.com/
1 page  
AD22304
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PGND
PDD CP5 CP3
CP4
7
6
ST1 CP1 5
ST2 CP2 4
TEMP
AVCC 3
2
1
AGND
G
2.5V CMID SUMJ
FEDC
B
RATEOUT
A
Figure 3. BGA-32 (Bottom View)
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
6D, 7D
CP5
6A, 7B
CP4
6C, 7C
CP3
5A, 5B
CP1
4A, 4B
CP2
3A, 3B
AVCC
1B, 2A
RATEOUT
1C, 2C
SUMJ
1D, 2D
CMID
1E, 2E
2.5V
1F, 2G
AGND
3F, 3G
TEMP
4F, 4G
ST2
5F, 5G
ST1
6G, 7F
PGND
6E, 7E
PDD
Description
HV Filter Capacitor—47 nF
Charge Pump Capacitor—22 nF
Charge Pump Capacitor—22 nF
Charge Pump Capacitor—22 nF
Charge Pump Capacitor—22 nF
+ Analog Supply
Rate Signal Output
Output Amp Summing Junction
HF Filter Capacitor—100 nF
2.5 V Precision Reference
Analog Supply Return
Temperature Voltage Output
Self-Test for Sensor 2
Self-Test for Sensor 1
Charge Pump Supply Return
+ Charge Pump Supply
Rev. C | Page 5 of 12
Free Datasheet http://www.datasheet4u.com/
5 Page 
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.
2.60
2.58
2.56
2.54
2.52
2.50
0 2 4 6 8 10
TIME (sec)
Figure 24. Random Vibration (Lateral) 10 kHz to 20 kHz
at 0.01 g/√Hz with 60 Hz Sampling and 0.5 sec Averaging
2.60
2.58
2.56
2.54
2.52
2.50
0 2 4 6 8 10
TIME (sec)
Figure 25. Random Vibration (Lateral) 2 Hz to 40 Hz, 3.2 g rms
AD22304
2.60
2.58
2.56
STATIC 0.8mV rms
2.54
2.52
SHAKING 2.4mV rms
2.50
0 2 4 6 8 10
TIME (sec)
Figure 26. Random Vibration (Lateral) 10 kHz to 20 kHz
at 0.01 g/√Hz with 60 Hz Sampling and 0.5 sec Averaging
–60
–70
–80
–90
–100
–110
–120
–130
0
10
100
1000
10000
100000
FREQUENCY (Hz)
Figure 27. Noise Spectral Density at RATEOUT –BW = 4 Hz
Rev. C | Page 11 of 12
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD22304.PDF ] | |
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