ADXRS649 Datasheet, PDF (1/12 Pages) Analog Devices – Fast Starting, ±20,000°/sec Vibration Rejecting Rate Gyro

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
Fast Starting, ±20,000°/sec
Vibration Rejecting Rate Gyro
ADXRS649
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
5V
(ADC REF)
100nF
5V
100nF
AV_CC
AGND
ST2 ST1
SELF-TEST
DRIVE
AMP
MECHANICAL
SENSOR
TEMP V_RATIO
ADXRS649
25kΩ ^25kΩ
AT 25°C
AC
AMP
VGA
DEMOD
5V
V_DD
100nF
PGND
CHARGE PUMP
AND VOLTAGE
REGULATOR
CP1 CP2 CP3 CP4 CP5 SUMJ
R_OUT
180kΩ ±1%
RATEOUT
22nF
22nF
2.2nF
C_OUT
Figure 1.
Rev. 0
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