EVAL-ADXRS646Z AD [Analog Devices], EVAL-ADXRS646Z Datasheet

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EVAL-ADXRS646Z

Manufacturer Part Number
EVAL-ADXRS646Z
Description
High Stability, Low Noise Vibration Rejecting Yaw Rate Gyro
Manufacturer
AD [Analog Devices]
Datasheet
Data Sheet
FEATURES
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
Rev. 0
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.
100nF
100nF
6V
6V
AV
AGND
V
PGND
DD
CC
CP1 CP2 CP3 CP4 CP5
DRIVE
AMP
FUNCTIONAL BLOCK DIAGRAM
Vibration Rejecting Yaw Rate Gyroscope
22nF
CHARGE PUMP
AND VOLTAGE
REGULATOR
ST2
MECHANICAL
SELF-TEST
SENSOR
ST1
22nF
Figure 1.
@ 25°C
100nF
SUMJ
25kΩ
TEMP
AMP
AC
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The
(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
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
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
chip-scale package.
C
OUT
25kΩ
V
ADXRS646
ADXRS646
ADXRS646
RATIO
(ADC REF)
3V TO 6V
180kΩ ±1%
RATEOUT
R
VGA
OUT
High Stability, Low Noise
offers superior vibration immunity and acceleration
ADXRS646
100nF
DEMOD
is available in a 7 mm × 7 mm × 3 mm CBGA
is a high performance angular rate sensor
is manufactured using the Analog Devices,
©2011 Analog Devices, Inc. All rights reserved.
ADXRS646
www.analog.com

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EVAL-ADXRS646Z Summary of contents

Page 1

Data Sheet FEATURES 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 ...

Page 2

ADXRS646 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 ...

Page 3

Data Sheet SPECIFICATIONS All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed 25° RATIO otherwise noted. Table 1. Parameter SENSITIVITY 1 Measurement ...

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 ...

Page 5

Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic 6D, 7D CP5 6A, 7B CP4 6C, 7C CP3 5A, 5B CP1 4A, 4B CP2 3A 1B, 2A RATEOUT 1C, 2C SUMJ ...

Page 6

ADXRS646 TYPICAL PERFORMANCE CHARACTERISTICS N > 1000 for all typical performance plots, unless otherwise noted RATEOUT (V) Figure 4. Null Bias at 25° DRIFT (°/sec/°C) Figure ...

Page 7

Data Sheet ST1Δ (mV) Figure 10. ST1 Output Change at 25°C (V –0.30 –0.35 –0.40 –0.45 –0.50 –0.55 –0.60 –0.65 –0.70 –0.75 –60 –40 – TEMPERATURE (°C) Figure 11. ST1 ...

Page 8

ADXRS646 OUTPUT (V) TEMP Figure 16. V Output at 25°C (V TEMP 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 –100 – TEMPERATURE (°C) Figure 17. ...

Page 9

Data Sheet THEORY OF OPERATION The ADXRS646 operates on the principle of a resonator gyroscope. Figure 19 shows a simplified version of one of four polysilicon sensing structures. Each sensing structure contains a dither frame that is electrostatically driven to ...

Page 10

ADXRS646 SUPPLY RATIOMETRICITY The null output voltage (RATEOUT), sensitivity, self-test responses (ST1 and ST2), and temperature output (TEMP) of the ADXRS646 are ratiometric to V RATIO the ADXRS646 with a supply-ratiometric ADC results in self- cancellation of errors resulting from ...

Page 11

... Gyroscopes are designed to respond only to rotation. However, all gyroscopes respond to linear motion as well, to varying degrees. While bias stability is often used as the primary figure of merit for evaluating high performance gyroscopes, many additional error sources are present in real-world applications. Especially in applications that require motion sensors, vibration and acceleration are present, and the resulting errors often overwhelm bias drift ...

Page 12

... CORNER 3.80 MAX ORDERING GUIDE Model 1 Temperature Range ADXRS646BBGZ –40°C to +105°C ADXRS646BBGZ-RL –40°C to +105°C EVAL-ADXRS646Z RoHS Compliant Part. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09771-0-9/11(0) 7.05 6. ...

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