Dual-Axis, High-g, iMEMS Accelerometers ADXL278 FEATURES GENERAL DESCRIPTION Complete dual-axis acceleration measurement system on a The ADXL278 is a low power, complete, dual-axis single monolithic IC accelerometer with signal conditioned voltage outputs that are Available in 35 g/35 g, 50 g/50 g, or 70 g/35 g output on a single monolithic IC. This product measures acceleration full-scale ranges with a full-scale range of (X-axis/Y-axis) 35 g/35 g, 50 g/ Full differential sensor and circuitry for high resistance to 50 g, or 70 g/35 g (minimum). The ADXL278 can also EMI/RFI measure both dynamic acceleration (vibration) and static Environmentally robust packaging acceleration (gravity). Complete mechanical and electrical self-test on digital The ADXL278 is the fourth-generation surface micromachined command iMEMS accelerometer from ADI with enhanced performance Output ratiometric to supply and lower cost. Designed for use in front and side impact airbag Sensitive axes in the plane of the chip applications, this product also provides a complete cost- High linearity (0.2% of full scale) effective solution useful for a wide variety of other applications. Frequency response down to dc The ADXL278 is temperature stable and accurate over the Low noise automotive temperature range, with a self-test feature that fully Low power consumption exercises all the mechanical and electrical elements of the sensor Tight sensitivity tolerance and 0 g offset capability with a digital signal applied to a single pin. Largest available prefilter clipping headroom 400 Hz, 2-pole Bessel filter The ADXL278 is available in a 5 mm 5 mm 2 mm, Single-supply operation 8-terminal ceramic LCC package. Compatible with Sn/Pb and Pb-free solder processes Qualified for automotive applications APPLICATIONS Vibration monitoring and control Vehicle collision sensing Shock detection FUNCTIONAL BLOCK DIAGRAM ADXL278 400Hz DIFFERENTIAL DEMOD EXC BESSEL X OUT SENSOR AMP FILTER V S V DD V DD2 TIMING GENERATOR V DD3 400Hz DIFFERENTIAL DEMOD EXC BESSEL Y OUT SENSOR AMP FILTER SELF-TEST Figure 1. Rev. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com 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. Fax: 781.461.3113 2010 Analog Devices, Inc. All rights reserved. OBSOLETE 05365-001ADXL278 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation .........................................................................7 Applications ....................................................................................... 1 Applications ........................................................................................8 General Description ......................................................................... 1 Power Supply Decoupling ............................................................8 Functional Block Diagram .............................................................. 1 Self-Test ..........................................................................................8 Revision History ............................................................................... 2 Clock Frequency Supply Response .............................................8 Specifications ..................................................................................... 3 Signal Distortion ...........................................................................8 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ..........................................................................9 ESD Caution .................................................................................. 4 ADXL278 Ordering Guide ...........................................................9 Pin Configuration and Function Descriptions ............................. 5 Automotive Products ....................................................................9 REVISION HISTORY 8/10Rev. A to Rev. B Updated Format .................................................................. Universal Change to Features Section ............................................................. 1 Updated Outline Dimensions ......................................................... 9 Changes to Ordering Guide ............................................................ 9 Added Automotive Products Section............................................. 9 7/02Rev. D to Rev. E Edits to Features ................................................................................ 1 5/05Rev. 0 to Rev. A Rev. B Page 2 of 12 OBSOLETE