±150°/Sec Yaw Rate Gyroscope
ADXRS623
FEATURES
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
–40°C to +105°C operation
Self-test on digital command
Ultrasmall and light (<0.15 cc, <0.5 gram)
Temperature sensor output
RoHS compliant
Qualified for automotive applications
GENERAL DESCRIPTION
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.
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.
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 conditioning
circuits. The ADXRS623 is available in a 7 mm × 7 mm × 3 mm
ceramic ball grid array (CBGA) package.
APPLICATIONS
Inertial measurement units
Platform stabilization
Robotics
FUNCTIONAL BLOCK DIAGRAM
+5V
(ADC REF)
100nF
+5V
AV
CC
100nF
AGND
DEMOD
DRIVE
AMP
ST2
ST1
TEMP
V
RATIO
ADXRS623
SELF-TEST
25kΩ
@ 25°C
25kΩ
MECHANICAL
SENSOR
AC
AMP
VGA
+5V
V
DD
CHARGE PUMP
AND VOLTAGE
REGULATOR
PGND
CP1 CP2 CP3 CP4 CP5
SUMJ
100nF
22nF
22nF
C
OUT
180kΩ
± 1%
100nF
RATEOUT
08890-001
Figure 1.
Rev. A
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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
ADXRS623
TABLE OF CONTENTS
Features .............................................................................................. 1
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
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
Automotive Products ................................................................. 11
REVISION HISTORY
11/10—Rev. 0 to Rev. A
Change to Features ........................................................................... 1
Change Operating Temperature Range, Table 2........................... 4
Added Automotive Products Section........................................... 11
3/10—Revision 0: Initial Version
Rev. A | Page 2 of 12
ADXRS623
SPECIFICATIONS
All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. T
A
= −40°C to +105°C, V
S
= AV
CC
=
V
DD
= 5 V, V
RATIO
= AV
CC
, angular rate = 0°/sec, bandwidth = 80 Hz (C
OUT
= 0.01 µF), I
OUT
= 100 µA, ±1
g,
unless otherwise noted.
Table 1.
Parameter
SENSITIVITY (RATIOMETRIC)
1
Measurement Range
2
Initial and over Temperature
Temperature Drift
3
Nonlinearity
NULL (RATIOMETRIC)
1
Null
Null Drift over Temperature
Linear Acceleration Effect
NOISE PERFORMANCE
Rate Noise Density
FREQUENCY RESPONSE
Bandwidth
4
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
V
OUT
at 25°C
Scale Factor
5
Load to V
S
Load to Common
TURN-ON TIME
OUTPUT DRIVE CAPABILITY
Current Drive
Capacitive Load Drive
POWER SUPPLY
Operating Voltage (V
S
)
VRATIO Input
Supply Current
TEMPERATURE RANGE
Specified Performance
1
2
Test Conditions/Comments
Clockwise rotation is positive output
Full-scale range over specifications range
Min
±150
11.25
Typ
Max
Unit
°/sec
mV/°/sec
%
% of FS
V
mV
°/sec/g
°/sec/√Hz
Best fit straight line
−40°C to +105°C
−40°C to +105°C
Any axis
T
A
= 25°C
1
12.5
±3
0.1
2.5
13.75
±250
0.1
0.04
3000
14.5
Hz
kHz
mV
mV
V
V
kΩ
V
mV/°C
kΩ
kΩ
ms
µA
pF
V
V
mA
°C
ST1 pin from Logic 0 to Logic 1
ST2 pin from Logic 0 to Logic 1
−500
500
0.8 × V
RATIO
−1000
1000
0.2 × V
RATIO
To common
Load = 100 MΩ
At 25°C, V
RATIO
= 5 V
2.35
50
2.5
9.1
25
25
2.65
Power on to ±½°/sec of final
For rated specifications
50
200
1000
4.75
3
5.00
3.5
–40
5.25
V
S
5.0
+105
Parameter is linearly ratiometric with V
RATIO
.
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, C
OUT
.
5
For a change in temperature from 25°C to 26°C. V
TEMP
is ratiometric to V
RATIO
. See the Temperature Output and Calibration section for more details.
Rev. A | Page 3 of 12
ADXRS623
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Acceleration (Any Axis, 0.5 ms)
Unpowered
Powered
V
DD
, AV
CC
V
RATIO
Output Short-Circuit Duration
(Any Pin to Common)
Operating Temperature Range
Storage Temperature Range
Rating
2000
g
2000
g
–0.3 V to +6.0 V
AV
CC
Indefinite
–55°C to +125°C
–65°C to +150°C
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.
RATE AXIS
V
CC
= 5V
LONGITUDINAL
AXIS
+
V
RATIO
/2
7
A1
A
B
C
D
E
F
LATERAL AXIS
1
G
GND
RATE IN
0.25V
08890-002
RATE OUT
4.75V
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.
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.
Figure 2. RATEOUT Signal Increases with Clockwise Rotation
ESD CAUTION
Rev. A | Page 4 of 12
ADXRS623
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PGND
V
DD
CP5
CP3
CP4
7
6
ST1
ST2
TEMP
CP1
CP2
AV
CC
5
4
3
2
1
AGND
G
F
V
RATIO
E
NC
D
SUMJ
C
B
A
RATEOUT
08890-003
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
CP5
CP4
CP3
CP1
CP2
AV
CC
RATEOUT
SUMJ
NC
V
RATIO
AGND
TEMP
ST2
ST1
PGND
V
DD
Description
HV Filter Capacitor (100 nF).
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. A | Page 5 of 12
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