EVAL-ADXRS623Z [ADI]
±150°/Sec Yaw Rate Gyroscope; ±150 °/秒偏航角速度陀螺仪
| 型号： | EVAL-ADXRS623Z |
| 厂家： | 
ADI |
| 描述： | ±150°/Sec Yaw Rate Gyroscope |
| 文件： | 总12页 (文件大小：383K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
± ±150°/Sec YacꢀYꢁScꢂGyroerꢃS
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ADXꢀ/623
FEATURES
GENERAL DESCRIPTION
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g powered shock survivability
Ratiometric to referenced supply
5 V single-supply operation
The ADXRS623 is a complete angular rate sensor (gyroscope)
that uses the Analog Devices, Inc., surface-micromachining
process to create a functionally complete and low cost angular
rate sensor integrated with all 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.
–40°C to +105°C operation
Self-test on digital command
Ultrasmall and light (<0.15 cc, <0.5 gram)
Temperature sensor output
The output signal, RATEOUT (1B, 2A), is a voltage proportional
to the angular rate about the axis that is normal to the top surface
of the package. The output is ratiometric with respect to a pro-
vided reference supply. An external capacitor sets the bandwidth.
Other external capacitors are required for operation.
RoHS compliant
APPLICATIONS
Inertial measurement units
Platform stabilization
Robotics
A temperature output is provided for compensation techniques.
Two digital self-test inputs electromechanically excite the sensor
to test proper operation of both the sensor and the signal con-
ditioning circuits. The ADXRS623 is available in a 7 mm × 7 mm
× 3 mm ceramic ball grid array (CBGA) package.
FUNCTIONAL BLOCK DIAGRAM
+5V
(ADC REF)
100nF
+5V
ST2 ST1
TEMP
V
RATIO
ADXRS623
AV
CC
100nF
25kΩ
SELF-TEST
25kΩ
@ 25°C
AGND
DEMOD
MECHANICAL
SENSOR
DRIVE
AMP
AC
AMP
VGA
+5V
180kΩ ± 1%
V
DD
CHARGE PUMP
AND VOLTAGE
REGULATOR
100nF
PGND
CP1 CP2 CP3 CP4 CP5
SUMJ
100nF
RATEOUT
22nF
22nF
C
OUT
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. 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 Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
ADXRS623
TABLE OF CONTENTS
Features .............................................................................................. 1
Theory of Operation .........................................................................9
Setting Bandwidth.........................................................................9
Temperature Output and Calibration.........................................9
Calibrated Performance................................................................9
ADXRS623 and Supply Ratiometricity ................................... 10
Null Adjustment ......................................................................... 10
Self-Test Function ...................................................................... 10
Continuous Self-Test.................................................................. 10
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 11
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Rate-Sensitive Axis....................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
3/10—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADXRS623
SPECIFICATIONS
All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. TA = −40°C to +105°C, VS = AVCC
DD = 5 V, VRATIO = AVCC, angular rate = 0°/sec, bandwidth = 80 Hz (COUT = 0.01 µF), IOUT = 100 µA, 1 g, unless otherwise noted.
=
V
Table 1.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
SENSITIVITY (RATIOMETRIC)1
Measurement Range2
Initial and over Temperature
Temperature Drift3
Nonlinearity
Clockwise rotation is positive output
Full-scale range over specifications range
150
11.25
°/sec
mV/°/sec
%
12.5
3
0.1
13.75
Best fit straight line
% of FS
NULL (RATIOMETRIC)1
Null
−40°C to +105°C
−40°C to +105°C
Any axis
2.5
V
mV
°/sec/g
Null Drift over Temperature
Linear Acceleration Effect
NOISE PERFORMANCE
Rate Noise Density
FREQUENCY RESPONSE
Bandwidth4
250
0.1
TA = 25°C
0.04
°/sec/√Hz
1
3000
Hz
Sensor Resonant Frequency
SELF-TEST (RATIOMETRIC)1
ST1 RATEOUT Response
ST2 RATEOUT Response
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Impedance
TEMPERATURE SENSOR (RATIOMETRIC)1
VOUT at 25°C
Scale Factor5
14.5
kHz
ST1 pin from Logic 0 to Logic 1
ST2 pin from Logic 0 to Logic 1
−500
500
0.8 × VRATIO
−1000
1000
mV
mV
V
V
kΩ
0.2 × VRATIO
2.65
To common
50
Load = 100 MΩ
At 25°C, VRATIO = 5 V
2.35
2.5
9.1
25
V
mV/°C
kΩ
Load to VS
Load to Common
25
kΩ
TURN-ON TIME
Power on to ½°/sec of final
For rated specifications
50
ms
OUTPUT DRIVE CAPABILITY
Current Drive
Capacitive Load Drive
POWER SUPPLY
200
1000
µA
pF
Operating Voltage (VS)
VRATIO Input
Supply Current
4.75
3
5.00
3.5
5.25
VS
5.0
V
V
mA
TEMPERATURE RANGE
Specified Performance
–40
+105
°C
1 Parameter is linearly ratiometric with VRATIO
.
2 The maximum range possible, including output swing range, initial offset, sensitivity, offset drift, and sensitivity drift at 5 V supplies.
3 From +25°C to −40°C or from +25°C to +105°C.
4 Adjusted by external capacitor, COUT
.
5 For a change in temperature from 25°C to 26°C. VTEMP is ratiometric to VRATIO. See the Temperature Output and Calibration section for more details.
Rev. 0 | Page 3 of 12
ADXRS623
ABSOLUTE MAXIMUM RATINGS
Table 2.
RATE-SENSITIVE AXIS
The ADXRS623 is a Z-axis, rate-sensing device (also called a
yaw rate-sensing device). It produces a positive-going output
voltage for clockwise rotation about the axis normal to the
package top, that is, clockwise when looking down at the
package lid.
Parameter
Rating
Acceleration (Any Axis, 0.5 ms)
Unpowered
Powered
VDD, AVCC
VRATIO
2000 g
2000 g
–0.3 V to +6.0 V
AVCC
RATE AXIS
RATE OUT
Output Short-Circuit Duration
(Any Pin to Common)
Operating Temperature Range
Storage Temperature Range
Indefinite
V
= 5V
CC
+
4.75V
–40°C to +125°C
–65°C to +150°C
LONGITUDINAL
AXIS
V
/2
RATIO
7
RATE IN
0.25V
Stresses above those listed under the Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
1
A1
A
B
C
D
E
F
G
GND
LATERAL AXIS
Figure 2. RATEOUT Signal Increases with Clockwise Rotation
ESD CAUTION
Drops onto hard surfaces can cause shocks of >2000 g and can
exceed the absolute maximum rating of the device. Exercise
care during handling to avoid damage.
Rev. 0 | Page 4 of 12
ADXRS623
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
V
CP5
CP3
DD
CP4
PGND
7
6
5
4
3
2
CP1
ST1
CP2
ST2
AV
TEMP
CC
1
AGND
RATEOUT
V
NC
D
SUMJ
C
RATIO
G
F
E
B
A
NC = NO CONNECT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
6D, 7D
6A, 7B
6C, 7C
5A, 5B
4A, 4B
3A, 3B
1B, 2A
1C, 2C
1D, 2D
1E, 2E
1F, 2G
3F, 3G
4F, 4G
5F, 5G
6G, 7F
6E, 7E
Mnemonic
Description
HV Filter Capacitor (100 nF).
CP5
CP4
CP3
CP1
CP2
AVCC
RATEOUT
SUMJ
NC
VRATIO
AGND
TEMP
ST2
ST1
PGND
VDD
Charge Pump Capacitor (22 nF).
Charge Pump Capacitor (22 nF).
Charge Pump Capacitor (22 nF).
Charge Pump Capacitor (22 nF).
Positive Analog Supply.
Rate Signal Output.
Output Amplifier Summing Junction.
No Connect.
Reference Supply for Ratiometric Output.
Analog Supply Return.
Temperature Voltage Output.
Self-Test for Sensor 2.
Self-Test for Sensor 1.
Charge Pump Supply Return.
Positive Charge Pump Supply.
Rev. 0 | Page 5 of 12
ADXRS623
TYPICAL PERFORMANCE CHARACTERISTICS
N > 1000 for all typical performance plots, unless otherwise noted.
30
25
20
15
10
5
25
20
15
10
5
0
0
−10 −8
−6
−4
−2
0
2
4
6
8
10
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
PERCENT DRIFT (%)
RATEOUT (V)
Figure 4. Null Output at 25°C (VRATIO = 5 V)
Figure 7. Sensitivity Drift over Temperature
45
40
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
0
0
–0.5 –0.4 –0.3 –0.2 –0.1
0
0.1 0.2 0.3 0.4 0.5
(°/s/°C)
ST1 Δ (mV)
Figure 5. Null Drift over Temperature (VRATIO = 5 V)
Figure 8. ST1 Output Change at 25°C (VRATIO = 5 V)
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
0
0
ST2 Δ (mV)
SENSITIVITY (mV/°/s)
Figure 9. ST2 Output Change at 25°C (VRATIO = 5 V)
Figure 6. Sensitivity at 25°C (VRATIO = 5 V)
Rev. 0 | Page 6 of 12
ADXRS623
30
25
20
15
10
5
40
35
30
25
20
15
10
5
0
0
2.40 2.42 2.44 2.46 2.48 2.50 2.52 2.54 2.56 2.58 2.60
125
135
145
155
165
175
185
195
MEASUREMENT RANGE (°/s)
VOLTAGE (V)
Figure 10. Measurement Range
Figure 13. VTEMP Output at 25°C (VRATIO = 5 V)
3.3
1.5
3.1
2.9
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.0
0.5
ST2
0
−0.5
−1.0
−1.5
ST1
256 PARTS
100 120
–40
–20
0
20
40
60
80
−40
−20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 14. VTEMP Output over Temperature (VRATIO = 5 V)
Figure 11. Typical Self-Test Change over Temperature
30
60
50
REF
Y
X
+45°
–45°
25
20
15
10
5
40
30
20
10
0
–10
0
–20
750
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
CURRENT CONSUMPTION (mA)
770
790
TIME (ms)
810
830
850
Figure 12. Current Consumption at 25°C (VRATIO = 5 V)
Figure 15. g and g × g Sensitivity for a 50 g, 10 ms Pulse
Rev. 0 | Page 7 of 12
ADXRS623
0.10
0.05
2.0
LATITUDE
LONGITUDE
RATE
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
–0.05
–0.10
0
20
40
60
80
100
120
140
100
1k
10k
FREQUENCY (Hz)
TIME (Hours)
Figure 16. Typical Response to 10 g Sinusoidal Vibration
Figure 19. Typical Shift in 90 Sec Null Averages Accumulated
over 140 Hours
(Sensor Bandwidth = 2 kHz)
0.10
400
300
DUT1 OFFSET BY +200°/s
0.05
0
200
100
0
–100
–200
–300
–400
DUT2 OFFSET BY –200°/s
–0.05
–0.10
0
600
1200
1800
2400
3000
3600
0
50
100
150
200
250
TIME (Seconds)
(ms)
Figure 20. Typical Shift in Short-Term Null (Bandwidth = 1 Hz)
Figure 17. Typical High g (2500 g) Shock Response
(Sensor Bandwidth = 40 Hz)
0.1
1
0.01
0.001
0.1
0.01
0.0001
0.001
10
100
1k
10k
100k
0.01
0.1
1
10
100
1k
10k
100k
FREQUENCY (Hz)
AVERAGE TIME (Seconds)
Figure 18. Typical Root Allan Deviation at 25°C vs. Averaging Time
Figure 21. Typical Noise Spectral Density (Bandwidth = 40 Hz)
Rev. 0 | Page 8 of 12
ADXRS623
THEORY OF OPERATION
The ADXRS623 operates on the principle of a resonator
gyroscope. Two polysilicon sensing structures each contain a
dither frame that is electrostatically driven to resonance,
producing the necessary velocity element to produce a Coriolis
force while rotating. At two of the outer extremes of each frame,
orthogonal to the dither motion, are movable fingers that are
placed between fixed pickoff fingers to form a capacitive pickoff
structure that senses Coriolis motion. The resulting signal is fed
to a series of gain and demodulation stages that produce the
electrical rate signal output. The dual-sensor design rejects
external g forces and vibration. Fabricating the sensor with
signal conditioning electronics preserves signal integrity in
noisy environments.
Figure 22 shows the effect of adding a 250 Hz filter to the
output of an ADXRS623 set to 40 Hz bandwidth (as shown
in Figure 21). High frequency demodulation artifacts are
attenuated by approximately 18 dB.
0.1
0.01
0.001
0.0001
0.00001
0.000001
The electrostatic resonator requires 18 V to 20 V for operation.
Because only 5 V are typically available in most applications, a
charge pump is included on chip. If an external 18 V to 20 V
supply is available, the two capacitors on CP1 through CP4 can
be omitted, and this supply can be connected to the CP5 pin
(6D, 7D). Note that CP5 should not be grounded when power is
applied to the ADXRS623. Although no damage occurs, under
certain conditions, the charge pump may fail to start up after
the ground is removed without first removing power from the
ADXRS623.
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 22. Noise Spectral Density with Additional 250 Hz Filter
TEMPERATURE OUTPUT AND CALIBRATION
It is common practice to temperature-calibrate gyroscopes to
improve their overall accuracy. The ADXRS623 has a tempera-
ture proportional voltage output that provides input to such a
calibration method. The temperature sensor structure is shown
in Figure 23. The temperature output is characteristically
nonlinear, and any load resistance connected to the TEMP
output results in decreasing the TEMP output and temperature
coefficient. Therefore, buffering the output is recommended.
SETTING BANDWIDTH
External Capacitor COUT is used in combination with the
on-chip ROUT resistor to create a low-pass filter to limit the
bandwidth of the ADXRS623 rate response. The –3 dB
frequency set by ROUT and COUT is
1
The voltage at the TEMP pin (3F, 3G) is nominally 2.5 V at
25°C and VRATIO = 5 V. The temperature coefficient is ~9 mV/°C
at 25°C. Although the TEMP output is highly repeatable, it has
only modest absolute accuracy.
fOUT
=
2 × π × ROUT ×COUT
and can be well controlled because ROUT is trimmed during
manufacturing to be 180 kΩ 1%. Any external resistor applied
between the RATEOUT pin (1B, 2A) and the SUMJ pin (1C,
2C) results in
V
TEMP
V
RATIO
(
180 kΩ × REXT
)
R
R
TEMP
FIXED
ROUT
=
180 kΩ + REXT
Figure 23. ADXRS623 Temperature Sensor Structure
In general, an additional hardware or software filter is added to
attenuate high frequency noise arising from demodulation
spikes at the gyroscope’s 14 kHz resonant frequency (the noise
spikes at 14 kHz can be clearly seen in the power spectral
density curve shown in Figure 21). Typically, the corner
frequency of this additional filter is set to greater than 5× the
required bandwidth to preserve good phase response.
CALIBRATED PERFORMANCE
Using a three-point calibration technique, it is possible to
calibrate the null and sensitivity drift of the ADXRS623 to an
overall accuracy of nearly 200°/hour. An overall accuracy of
40°/hour or better is possible using more points.
Limiting the bandwidth of the device reduces the flat-band
noise during the calibration process, improving the measure-
ment accuracy at each calibration point.
Rev. 0 | Page 9 of 12
ADXRS623
SELF-TEST FUNCTION
ADXRS623 AND SUPPLY RATIOMETRICITY
The ADXRS623 includes a self-test feature that actuates each of
the sensing structures and associated electronics as if subjected
to angular rate. It is activated by standard logic high levels
applied to Input ST1 (5F, 5G), Input ST2 (4F, 4G), or both. ST1
causes the voltage at RATEOUT to change about −1.0 V, and
ST2 causes an opposite change of +1.0 V. The self-test response
follows the viscosity temperature dependence of the package
atmosphere, approximately 0.25%/°C.
The ADXRS623 RATEOUT and TEMP signals are ratiometric
to the VRATIO voltage; that is, the null voltage, rate sensitivity, and
temperature outputs are proportional to VRATIO. Thus, the
ADXRS623 is most easily used with a supply-ratiometric ADC
that results in self-cancellation of errors due to minor supply
variations. There is some small error due to nonratiometric
behavior. Typical ratiometricity error for null, sensitivity, self-
test, and temperature output is outlined in Table 4.
Activating both ST1 and ST2 simultaneously is not damaging.
ST1 and ST2 are fairly closely matched ( 5%), but actuating
both simultaneously may result in a small apparent null bias
shift proportional to the degree of self-test mismatch.
Note that VRATIO must never be greater than AVCC
.
Table 4. Ratiometricity Error for Various Parameters
Parameter
ST1
VS = VRATIO = 4.85 V
VS = VRATIO = 5.15 V
ST1 and ST2 are activated by applying a voltage of greater than
0.8 × VRATIO to the ST1 and ST2 pins. ST1 and ST2 are deacti-
vated by applying a voltage of less than 0.2 × VRATIO to the ST1
and ST2 pins. The voltage applied to ST1 and ST2 must never
Mean
Sigma
ST2
0.3%
0.21%
0.09%
0.19%
Mean
Sigma
Null
−0.15%
0.22%
−0.2%
0.2%
be greater than AVCC
.
CONTINUOUS SELF-TEST
Mean
Sigma
Sensitivity
Mean
Sigma
VTEMP
−0.3%
0.2%
−0.05%
0.08%
The one-chip integration of the ADXRS623 gives it higher
reliability than is obtainable with any other high volume
manufacturing method. In addition, it is manufactured under
a mature BiMOS process with field-proven reliability. As an
additional failure detection measure, a power-on self-test can be
performed. However, some applications may warrant continuous
self-test while sensing rate. Details about continuous self-test
techniques are available in the AN-768 Application Note, Using
the ADXRS150/ADXRS300 in Continuous Self-Test Mode, avail-
able at www.analog.com.
0.003%
0.06%
−0.25%
0.06%
Mean
Sigma
−0.2%
0.05%
−0.04%
0.06%
NULL ADJUSTMENT
The nominal 2.5 V null is for a symmetrical swing range at
RATEOUT (1B, 2A). However, a nonsymmetrical output swing
may be suitable in some applications. Null adjustment is
possible by injecting a suitable current to SUMJ (1C, 2C). Note
that supply disturbances may reflect some null instability.
Digital supply noise should be avoided, particularly in this case.
Rev. 0 | Page 10 of 12
ADXRS623
OUTLINE DIMENSIONS
7.05
6.85 SQ
6.70
*
A1 CORNER
INDEX AREA
A1 BALL
CORNER
7
6
5
4
3
2
1
A
B
C
D
E
F
4.80
BSC SQ
0.80
BSC
G
TOP VIEW
BOTTOM VIEW
DETAIL A
DETAIL A
3.80 MAX
3.20 MAX
2.50 MIN
0.60 MAX
0.25 MIN
0.60
0.55
COPLANARITY
0.15
SEATING
PLANE
0.50
BALL DIAMETER
*
BALL A1 IDENTIFIER IS GOLD PLATED AND CONNECTED
TO THE D/A PAD INTERNALLY VIA HOLES.
Figure 24. 32-Lead Ceramic Ball Grid Array [CBGA]
(BG-32-3)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
Temperature Range
–40°C to +105°C
–40°C to +105°C
Package Description
Package Option
ADXRS623WBBGZ
ADXRS623WBBGZ-RL
EVAL-ADXRS623Z
32-Lead Ceramic Ball Grid Array (CBGA)
32-Lead Ceramic Ball Grid Array (CBGA)
Evaluation Board
BG-32-3
BG-32-3
1 Z = RoHS Compliant Part.
Rev. 0 | Page 11 of 12
ADXRS623
NOTES
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08890-0-3/10(0)
Rev. 0 | Page 12 of 12
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