Fast Starting, ±20,000°/sec
Vibration Rejecting Rate Gyro
Data Sheet
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.
Tel: 781.329.4700 ©2010–2012 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
High vibration rejection over wide frequency
Ultrafast startup: 3 ms
Measurement range extendable to ±50,000°/sec
10,000 g powered shock survivability
Ratiometric to referenced supply
5 V single-supply operation
Z-axis (yaw rate) response
−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
APPLICATIONS
Sports equipment
Industrial applications
Platform stabilization
High speed tachometry
GENERAL DESCRIPTION
The ADXRS649 is a complete angular rate sensor (gyroscope)
that uses the Analog Devices, Inc., patented high volume BiMOS
surface-micromachining process to make a complete gyro on
one chip. An advanced, differential, quad sensor design rejects
the influence of linear acceleration, enabling the ADXRS649
to offer rate sensing in harsh environments where shock and
vibration are present.
The output signal, RATEOUT (B1, A2), is a voltage proportional
to the angular rate about the axis normal to the top surface of
the package. The output is ratiometric with respect to a provided
reference supply. An external capacitor is used to set the band-
width. The measurement range is extendable to ±50,000°/sec
by adding an external resistor.
Low power consumption (3.5 mA) enables very low power
consumption, and ultrafast startup (3 ms) allows for quick
power cycling of the gyro. At 10 samples per second, a pair of
CR2032 coin cells can power the ADXRS649 for three months.
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 condi-
tioning circuits. The ADXRS649 is available in a 7 mm × 7 mm ×
3 mm CBGA chip scale package.
FUNCTIONAL BLOCK DIAGRAM
V
DD
AGND
PGND
AV
CC
ST2 ST1
TEMP
V
RATIO
CP1
CP2 CP3
CP4 CP5
SUMJ RATEOUT
DEMOD
R
OUT
180kΩ ±1%
22nF
2.2nF
22nF
100nF
100nF
100nF
DRIVE
AMP
MECHANICAL
SENSOR
CHARGE PUMP
AND VOLTAGE
REGULATOR
C
OUT
5V
5V
5V
(ADC REF)
AC
AMP
VGA
25k
Ω
AT 25°C
ADXRS649
25kΩ
SELF-TEST
09573-001
Figure 1.
