ADXL278 Analog Devices, ADXL278 Datasheet

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ADXL278

Manufacturer Part Number
ADXL278
Description
Manufacturer
Analog Devices
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
ADXL278
Manufacturer:
ADI/亚德诺
Quantity:
20 000
FEATURES
Complete dual-axis acceleration measurement system on
Available in ±35 g/±35 g, ±50 g/±50 g, or ±70 g/±35 g
Full differential sensor and circuitry for high resistance
Environmentally robust packaging
Complete mechanical and electrical self-test on
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
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 owners.
a single monolithic IC
output full-scale ranges
to EMI/RFI
digital command
V
S
V
V
V
DD2
DD3
DD
EXC
EXC
FUNCTIONAL BLOCK DIAGRAM
GENERATOR
TIMING
DIFFERENTIAL
DIFFERENTIAL
SELF-TEST
SENSOR
SENSOR
Figure 1.
DEMOD
DEMOD
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.
AMP
AMP
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
ADXL278
BESSEL
BESSEL
FILTER
FILTER
400Hz
400Hz
iMEMS
©2005 Analog Devices, Inc. All rights reserved.
X
Y
OUT
OUT
®
Dual-Axis, High-g,
Accelerometers
ADXL278
www.analog.com

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ADXL278 Summary of contents

Page 1

... The ADXL278 is available × × 2 mm, 8-terminal ceramic LCC package. FUNCTIONAL BLOCK DIAGRAM DIFFERENTIAL ...

Page 2

... ADXL278 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Theory of Operation ........................................................................ 7 Applications....................................................................................... 8 REVISION HISTORY 5/05—Rev Rev. A Power Supply Decoupling ............................................................8 Self-Test ..........................................................................................8 Clock Frequency Supply Response .............................................8 Signal Distortion ...........................................................................8 Outline Dimensions ..........................................................................9 Ordering Guide .............................................................................9 Rev Page ...

Page 3

... X 216 270 324 Y 440 550 660 3 0.25 V − 0.25 0.25 1000 400 560 4 5.25 4.75 5.25 6 3.5 6 2.2 2.9 2.2 2.9 +105 −40 +105 ADXL278 Unit Degree Degree % kHz mV/g mV mg/√Hz mg/√ kΩ V − V/V V °C ...

Page 4

... ADXL278 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Acceleration (Any Axis, Unpowered) Acceleration (Any Axis, Powered All Other Pins Output Short-Circuit Duration (Any Pin to Common) Operating Temperature Range Storage Temperature 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 ...

Page 5

... DD2 V DD2 DD3 DD ADXL278 OUT OUT TOP VIEW (Not to Scale) COM CONNECT Figure 2. Pin Configuration Description 3 Channel Output Common Self-Test Do Not Connect X Channel Output 3 3 Rev Page ADXL278 ...

Page 6

... ADXL278 Table 4. Recommended Soldering Profile Profile Feature AVERAGE RAMP RATE ( PREHEAT Minimum Temperature (T ) SMIN Maximum Temperature (T ) SMAX TIME ( SMIN SMAX SMAX L Ramp-Up Rate TIME MAINTAINED ABOVE LIQUIDOUS (T Liquidous Temperature ( Time ( PEAK TEMPERATURE ( TIME WITHIN 5°C OF ACTUAL PEAK TEMPERATURE (t RAMP-DOWN RATE TIME 25° ...

Page 7

... THEORY OF OPERATION The ADXL278 provides a fully differential sensor structure and circuit path, resulting in the industry’s highest resistance to EMI/RFI effects. This latest generation uses electrical feedback with zero-force feedback for improved accuracy and stability. The sensor resonant frequency is significantly higher than the ...

Page 8

... However, both the power supply clock and the accelerometer clock may vary with time or temperature, which can cause the interference signal to appear in the output filter bandwidth. The ADXL278 addresses this issue in two ways. First, the high clock frequency eases the task of choosing a power supply clock . DC frequency such that the difference between it and the accelero- meter clock remains well outside of the filter bandwidth ...

Page 9

... Rev Page 0.50 DIAMETER 1 1.90 2.50 0.64 2.50 3 0.38 DIAMETER Package Description 8-Lead Ceramic Leadless Chip Carrier 8-Lead Ceramic Leadless Chip Carrier 8-Lead Ceramic Leadless Chip Carrier 8-Lead Ceramic Leadless Chip Carrier 8-Lead Ceramic Leadless Chip Carrier 8-Lead Ceramic Leadless Chip Carrier ADXL278 Package Option E-8 E-8 E-8 E-8 E-8 E-8 ...

Page 10

... ADXL278 NOTES Rev Page ...

Page 11

... NOTES Rev Page ADXL278 ...

Page 12

... ADXL278 NOTES ©2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05365–0–5/05(A) Rev Page ...

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