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AD8512A , Operational Amplifiers Selection Guide
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AD22284-A-R2-AD22285-AD22285-R2-AD22286-AD22286-R2-ADXL278
Dual-Axis, High-g, MEMS Accelerometers
Dual-Axis, High-g,
iMEMS® Accelerometers
Rev. A
FEATURES
Complete dual-axis acceleration measurement system on
a single monolithic IC
Available in ±35 g/±35 g, ±50 g/±50 g, or ±70 g/±35 g
output full-scale ranges
Full differential sensor and circuitry for high resistance
to EMI/RFI
Environmentally robust packaging
Complete mechanical and electrical self-test on
digital command
Output ratiometric to supply
Sensitive axes in the plane of the chip
High linearity (0.2% of full scale)
Frequency response down to dc
Low noise
Low power consumption
Tight sensitivity tolerance and 0 g offset capability
Largest available prefilter clipping headroom
400 Hz, 2-pole Bessel filter
Single-supply operation
Compatible with Sn/Pb and Pb-free solder processes
APPLICATIONS
Vibration monitoring and control
Vehicle collision sensing
Shock detection
GENERAL DESCRIPTION The ADXL278 is a low power, complete, dual-axis
accelerometer with signal conditioned voltage outputs that are
on a single monolithic IC. This product measures acceleration
with a full-scale range of (X-axis/Y-axis) ±35 g/±35 g, ±50 g/
±50 g, or ±70 g/±35 g (minimum). The ADXL278 can also
measure both dynamic acceleration (vibration) and static
acceleration (gravity).
The ADXL278 is the fourth-generation surface micromachined
iMEMS® accelerometer from ADI with enhanced performance
and lower cost. Designed for use in front and side impact airbag
applications, this product also provides a complete cost-
effective solution useful for a wide variety of other applications.
The ADXL278 is temperature stable and accurate over the
automotive temperature range, with a self-test feature that fully
exercises all the mechanical and electrical elements of the sensor
with a digital signal applied to a single pin.
The ADXL278 is available in a 5 mm × 5 mm × 2 mm,
8-terminal ceramic LCC package.
FUNCTIONAL BLOCK DIAGRAM 05365-001
YOUTXOUT Figure 1.
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
ESD Caution..................................................................................4
Pin Configuration and Function Descriptions.............................5
Theory of Operation........................................................................7
Applications.......................................................................................8
Power Supply Decoupling............................................................8
Self-Test..........................................................................................8
Clock Frequency Supply Response.............................................8
Signal Distortion...........................................................................8
Outline Dimensions..........................................................................9
Ordering Guide.............................................................................9
REVISION HISTORY
5/05—Rev. 0 to Rev. A SPECIFICATIONS1At TA = −40°C to +105°C, 5.0 V dc ± 5%, acceleration = 0 g, unless otherwise noted.
Table 1. All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.
2 Zero g output is ratiometric. 3
ABSOLUTE MAXIMUM RATINGS
Table 2. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC = NO CONNECT
VDD3
COM
VDD
XOUT
VDD2
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions t25°C TO PEAK
RATURE
TIME
Figure 3. Recommended Soldering Profile
Table 4. Recommended Soldering Profile 05365-004
EARTH'S SURFACE
XXXXXXXXX
PIN 8
YOUT = 2.500V
XOUT = 2.462V
XXXXX
XXXX
22285YOUT = 2.462V
XOUT = 2.500V
XXXXX
XXXX
XXXXX
XXXX
YOUT = 2.500V
XOUT = 2.538V
YOUT = 2.500V
XOUT = 2.500VFigure 4. Output Response vs. Orientation
