ADXL311JE-REEL Datasheet PDF - Analog Devices

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ADXL311JE-REEL
Analog Devices

Part Number ADXL311JE-REEL
Description Low Cost/ Ultracompact 2 g Dual-Axis Accelerometer
Page 12 Pages


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FEATURES
Low cost
High resolution
Dual-axis accelerometer on a single IC chip
5 mm × 5 mm × 2 mm CLCC package
Low power < 400 µA (typ)
X-axis and Y-axis aligned to within 0.1° (typ)
BW adjustment with a single capacitor
Single-supply operation
High shock survival
APPLICATIONS
Tilt and motion sensing in cost-sensitive applications
Smart handheld devices
Computer security
Input devices
Pedometers and activity monitors
Game controllers
Toys and entertainment products
Low Cost, Ultracompact
±2 g Dual-Axis Accelerometer
ADXL311
GENERAL DESCRIPTION
The ADXL311 is a low cost, low power, complete dual-axis
accelerometer with signal conditioned voltage outputs, all on a
single monolithic IC. The ADXL311 is built using the same
proven iMEMS® process used in over 100 million Analog
Devices accelerometers shipped to date, with demonstrated
1 FIT reliability (1 failure per 1 billion device operating hours).
The ADXL311 will measure acceleration with a full-scale
range of ±2 g. The ADXL311 can measure both dynamic
acceleration (e.g., vibration) and static acceleration (e.g.,
gravity). The outputs are analog voltages proportional to
acceleration.
The typical noise floor is 300 µg/Hz allowing signals below
2 mg (0.1° of inclination) to be resolved in tilt sensing appli-
cations using narrow bandwidths (10 Hz).
The user selects the bandwidth of the accelerometer using
capacitors CX and CY at the XFILT and YFILT pins. Bandwidths
of 1 Hz to 2 kHz may be selected to suit the application.
The ADXL311 is available in a 5 mm × 5 mm × 2 mm
8-terminal hermetic CLCC package
CDC
3.0V
VDD
CX
XOUT
X SENSOR
DEMOD
RFILT
32k
OSCILLATOR
ADXL311JE
Y SENSOR
DEMOD
32k
RFILT
COM
YOUT
CY
SELF TEST
BIAS
200k
Figure 1. Functional Block Diagram
Rev. A
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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved.



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ADXL311
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Typical Performance Characteristics ............................................. 5
Theory of Operation ........................................................................ 7
Applications................................................................................... 7
Design Trade-Offs for Selecting Filter Characteristics: The
Noise/BW Trade-Off.................................................................... 7
Using the ADXL311 as a Dual-Axis Tilt Sensor....................... 8
Pin Configuration and Functional Descriptions...........................9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
7/03—Data sheet changed from Rev. 0 to Rev. A.
Change to OUTLINE DIMENSIONS.......................................... 10
Revision 0: Initial Version
Rev. A | Page 2 of 12



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ADXL311
SPECIFICATIONS
Table 1. TA = 25oC, VDD = 3 V, RBIAS = 125 kΩ, Acceleration = 0 g, unless otherwise noted.)
Parameter
Conditions
Min Typ
SENSOR INPUT
Each Axis
Measurement Range
±2
Nonlinearity
Aligment Error1
Best Fit Straight Line
0.2
±1
Aligment Error
Cross Axis Sensitivity2
X Sensor to Y Sensor
0.01
±2
SENSITIVITY
Each Axis
Sensitivity at XFILT, YFILT
Sensitivity Change due to Temperature3
VDD = 3 V
Delta from 25°C
140 167
−0.025
ZERO g BIAS LEVEL
Each Axis
0 g Voltage XFILT, YFILT
0 g Offset vs. Temperature
VDD = 3 V
Delta from 25°C
1.2 1.5
2.0
NOISE PERFORMANCE
Noise Density
@25°C
300
FREQUENCY RESPONSE
3 dB Bandwidth
Sensor Resonant Frequency
At Pins XFILT, YFILT
6
10
FILTER
RFILT Tolerance
Minimum Capacitance
SELF TEST
32 kΩ Nominal
At Pins XFILT, YFILT
±15
1000
XFILT, YFILT
POWER SUPPLY
Self Test 0 to 1
45
Operating Voltage Range
2.7
Quiescent Supply Current
0.4
Turn-On Time
TEMPERATURE RANGE
160 × CFILT + 0.3
Operating Range
0
Max Units
g
% of FS
Degrees
Degrees
%
195 mV/g
%/°C
1.8 V
mg/°C
µg/√Hz RMS
kHz
kHz
%
pF
mV
5.25 V
1.0 mA
ms
70 °C
1 Alignment error is specified as the angle between the true and indicated axis of sensitivity (Figure 1).
2 Cross axis sensitivity is the algebraic sum of the alignment and the inherent sensitivity errors.
3 Defined as the output change from ambient to maximum temperature or ambient to minimum temperature.
Rev. A | Page 3 of 12



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ADXL311
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Acceleration
(Any Axis, Unpowered)
Acceleration
(Any Axis, Powered, VDD = 3 V)
VDD
Output Short-Circuit Duration,
(Any Pin to Commom)
Operating Temperature Range
Storage Temperature
Rating
3,500 g, 0.5 ms
3,500 g, 0.5 ms
–0.3 V to +0.6 V
Indefinite
–55°C to +125°C
–65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress rat-
ing only and functional operation of the device at these or any
other conditions above those indicated in the operational sec-
tion of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 3. Package Characteristics
Package Type
8-Lead CLCC
θJA
120°C/W
θJC
TBD°C/W
Device Weight
<1.0 gram
Rev. A | Page 4 of 12



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