Single-Axis, High-g, iMEMS Accelerometers ADXL78 FEATURES GENERAL DESCRIPTION Complete acceleration measurement system on a single The ADXL78 is a low power, complete single-axis accelerometer monolithic IC with signal conditioned voltage outputs that are on a single Available in 35 g, 50 g, or 70 g output full-scale ranges monolithic IC. This product measures acceleration with a full- Full differential sensor and circuitry for high resistance scale range of 35 g, 50 g, or 70 g (minimum). It can also to EMI/RFI measure both dynamic acceleration (vibration) and static Environmentally robust packaging acceleration (gravity). Complete mechanical and electrical self-test on The ADXL78 is the fourth-generation surface micromachined digital 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 ADXL78 is temperature stable and accurate over the Low noise automotive temperature range, with a self-test feature that fully Low power consumption (1.3 mA) exercises all the mechanical and electrical elements of the Tight sensitivity tolerance and 0 g offset capability sensor with a digital signal applied to a single pin. Largest available prefilter clipping headroom 400 Hz, 2-pole Bessel filter The ADXL78 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 V S ADXL78 TIMING V DD GENERATOR V DD2 400Hz DIFFERENTIAL DEMOD X EXC BESSEL 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. Fax: 781.461.3113 2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. OBSOLETE 05368-001ADXL78 TABLE OF CONTENTS Features .............................................................................................. 1 Applicat ions ........................................................................................8 Applications ....................................................................................... 1 Power Supply Decoupling ............................................................8 General Description ......................................................................... 1 Self-Test ..........................................................................................8 Functional Block Diagram .............................................................. 1 Clock Frequency Supply Response .............................................8 Specif icat ions ..................................................................................... 3 Signal Distortion ...........................................................................8 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ..........................................................................9 ESD Caution .................................................................................. 4 ADXL78 Ordering Guide .............................................................9 Pin Configuration and Function Descriptions ............................. 5 Automotive Products ....................................................................9 Theory of Operation ........................................................................ 7 REVISION HISTORY 7/10Rev. 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 5/05Rev. 0 to Rev. A Rev. B Page 2 of 12 OBSOLETE