ADXRS646 Datasheet, PDF (1/12 Pages) Analog Devices – High Stability, Low Noise Vibration Rejecting Yaw Rate Gyro

Data Sheet
High Stability, Low Noise
Vibration Rejecting Yaw Rate Gyroscope
ADXRS646
FEATURES
GENERAL DESCRIPTION
12°/hr bias stability
Z-axis (yaw rate) response
0.01°/√sec angle random walk
High vibration rejection over wide frequency
Measurement range extendable to a maximum of ±450°/sec
10,000 g powered shock survivability
Ratiometric to referenced supply
6 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
Complete rate gyroscope on a single chip
RoHS compliant
APPLICATIONS
Industrial applications
Severe mechanical environments
Platform stabilization
The ADXRS646 is a high performance angular rate sensor
(gyroscope) that offers excellent vibration immunity. Bias
stability is a widely-recognized figure of merit for high
performance gyroscopes, but in real-world applications,
vibration sensitivity is often a more significant performance
limitation and should be considered in gyroscope selection. The
ADXRS646 offers superior vibration immunity and acceleration
rejection as well as a low bias drift of 12°/hr (typical), enabling it
to offer rate sensing in harsh environments where shock and
vibration are present.
The ADXRS646 is manufactured using the Analog Devices,
Inc., patented high volume BiMOS surface-micromachining
process. An advanced, differential, quad sensor design provides
the improved acceleration and vibration rejection. The output
signal, RATEOUT, is a voltage proportional to angular rate
about the axis normal to the top surface of the package. The
measurement range is a minimum of ±250°/sec. The output is
ratiometric with respect to a provided reference supply. 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 condi-
tioning circuits.
The ADXRS646 is available in a 7 mm × 7 mm × 3 mm CBGA
chip-scale package.
FUNCTIONAL BLOCK DIAGRAM
3V TO 6V
(ADC REF)
100nF
6V
AV_CC
100nF
AGND
ST2 ST1
SELF-TEST
DRIVE
AMP
MECHANICAL
SENSOR
TEMP V_RATIO
ADXRS646
25kΩ 25kΩ
@ 25°C
AC
AMP
VGA
DEMOD
6V
V_DD
100nF
PGND
CHARGE PUMP
AND VOLTAGE
REGULATOR
R_OUT
180kΩ ±1%
CP1 CP2 CP3 CP4 CP5 SUMJ
RATEOUT
22nF
22nF
100nF
C_OUT
Figure 1.
Rev. 0
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