ADXRS646 Analog Devices, Inc., ADXRS646 Datasheet

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ADXRS646

Manufacturer Part Number
ADXRS646
Description
High Stability, Low Noise Vibration Rejecting Yaw Rate Gyro
Manufacturer
Analog Devices, Inc.
Datasheet
Preliminary Technical Data
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
8°/hour bias stability
0.01°/√second angle random walk
High vibration rejection over wide frequency
Measurement range extendable to a maximum of ±450°/s
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
RoHS compliant
APPLICATIONS
Industrial applications
Severe Mechanical Environments
Platform stabilization
6V
100nF
6V
100nF
Rev. PrA
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.
Vibration Rejecting Yaw Rate Gyro
GENERAL DESCRIPTION
The ADXRS646 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 and vibration, enabling the
ADXRS646 to offer rate sensing in harsh environments where
shock and vibration are present.
The output signal, RATEOUT (1B, 2A), is a voltage propor-
tional to angular rate about the axis normal to the top surface
of the package. The measurement range is a minimum of
±250°/s. 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 BGA chip-scale package.
FUNCTIONAL BLOCK DIAGRAM
3 to 6V
(ADC REF)
ST2
ST1
TEMP
V
RATIO
AV
CC
25k
SELF-TEST
25k
@ 25°C
AGND
AC
DRIVE
MECHANICAL
AMP
AMP
SENSOR
180k ±1%
V
DD
CHARGE PUMP
AND VOLTAGE
REGULATOR
PGND
SUMJ
RATEOUT
CP1 CP2 CP3 CP4 CP5
100nF
C
22nF
22nF
OUT
Figure 1. Block Diagram
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
High Stability, Low Noise
ADXRS646
100nF
ADXRS646
DEMOD
VGA
08820-001
www.analog.com
©2011 Analog Devices, Inc. All rights reserved.

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ADXRS646 Summary of contents

Page 1

... 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 × × BGA chip-scale package. FUNCTIONAL BLOCK DIAGRAM ...

Page 2

... ADXRS646 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 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 ........................................................................ 7 Preliminary Technical Data   Setting Bandwidth .........................................................................7   Temperature Output and Calibration .........................................7   ...

Page 3

... RATIO Power on to ±0.5°/s of final with CP5 = 100nF For rated specifications is ratiometric See the Temperature Output and Calibration section for more information. TEMP RATIO Rev. PrA | Page ADXRS646 = 0.01 μF 100 μA, OUT OUT Min Typ Max Unit ± ...

Page 4

... ADXRS646 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Acceleration (Any Axis, 0.5 ms) Unpowered Powered RATIO ST1, ST2 Output Short-Circuit Duration (Any Pin to Common) Operating Temperature Range Storage Temperature Range Stresses above those listed under the Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...

Page 5

... Output Amp Summing Junction. Do Not 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. PrA | Page CP4 7 6 CP1 5 CP2 RATEOUT A ADXRS646 ...

Page 6

... ADXRS646 TYPICAL PERFORMANCE CHARACTERISTICS N > 1000 for all histograms, unless otherwise noted Figure 4. Null Bias Error at 25°C Figure 5. Null Drift Over Temperature Figure 6. Null Output Over Temperature, Device Soldered on PCB Preliminary Technical Data Figure 7. Sensitivity Error at 25°C Figure 8. Sensitivity Drift Over Temperature ...

Page 7

... ADXRS646. SETTING BANDWIDTH External Capacitor C is used in combination with the on- OUT chip R resistor to create a low-pass filter to limit the bandwidth OUT of the ADXRS646 rate response. The −3 dB frequency set by R and C is OUT OUT   ...

Page 8

... Sine vibration over the 20Hz to 5kHz range. As can be seen, there are no sensitive frequencies present and vibration rectification is vanishingly small the previous example gyro bandwidth was set to 1600Hz. RATIO ‐0.02 ‐0.04 Figure 14. ADXRS646 Sine Vibration Output Response (5g, 20Hz to 5kHz) Rev. PrA | Page Preliminary Technical Data 1 0.1 0.01 0.001 ...

Page 9

... A1 BALL CORNER 3.80 MAX ORDERING GUIDE 1 Model Temperature Range ADXRS646BBGZ –40°C to +105°C ADXRS646BBGZ-RL –40°C to +105°C ADXRS646TBGZ-EP –55°C to +105°C ADXRS646TBGZ-EP-RL –55°C to +105°C EVAL-ADXRS646Z RoHS Compliant Part. 7.05 6. 4.80 BSC SQ 0.80 BSC TOP VIEW BOTTOM VIEW DETAIL A DETAIL A 0 ...

Page 10

... ADXRS646XRS646 NOTES Preliminary Technical Data Rev. PrA | Page ...

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... Preliminary Technical Data NOTES Rev. PrA | Page ADXRS646 ...

Page 12

... ADXRS646XRS646 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR09771-0-2/11(PrA) Preliminary Technical Data Rev. PrA | Page ...

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