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FEATURES
Complete acceleration measurement system on a single
monolithic IC
Available in ±35 g, ±50 g, or ±70 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 (1.3 mA)
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
Qualified for automotive applications
APPLICATIONS
Vibration monitoring and control
Vehicle collision sensing
Shock detection
Single-Axis, High-g,
iMEMS® Accelerometers
ADXL78
GENERAL DESCRIPTION
The ADXL78 is a low power, complete single-axis accelerometer
with signal conditioned voltage outputs that are on a single
monolithic IC. This product measures acceleration with a full-
scale range of ±35 g, ±50 g, or ±70 g (minimum). It can also
measure both dynamic acceleration (vibration) and static
acceleration (gravity).
The ADXL78 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 ADXL78 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 ADXL78 is available in a 5 mm × 5 mm × 2 mm,
8-terminal ceramic LCC package.
VS
VDD
VDD2
FUNCTIONAL BLOCK DIAGRAM
TIMING
GENERATOR
ADXL78
EXC
DIFFERENTIAL
SENSOR
DEMOD
AMP
400Hz
BESSEL
FILTER
XOUT
SELF-TEST
Figure 1.
Rev. B
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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©2010 Analog Devices, Inc. All rights reserved.

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ADXL78* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Documentation
Application Notes
• AN-652: Considerations for Soldering Accelerometers in
LCC-8 Packages onto Printed Circuit Boards
• AN-688: Phase and Frequency Response of iMEMS®
Accelerometers and Gyros
Data Sheet
• ADXL78: Single-Axis, High-g, iMEMS® Accelerometers
Data Sheet
Design Resources
• ADXL78 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all ADXL78 EngineerZone Discussions
Sample and Buy
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Technical Support
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frequently modified.

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ADXL78
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 4 
ESD Caution.................................................................................. 4 
Pin Configuration and Function Descriptions............................. 5 
Theory of Operation ........................................................................ 7 
REVISION HISTORY
7/10—Rev. 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
5/05—Rev. 0 to Rev. A
Applications........................................................................................8 
Power Supply Decoupling ............................................................8 
Self-Test ..........................................................................................8 
Clock Frequency Supply Response .............................................8 
Signal Distortion ...........................................................................8 
Outline Dimensions ..........................................................................9 
ADXL78 Ordering Guide.............................................................9 
Automotive Products ....................................................................9 
Rev. B | Page 2 of 12

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ADXL78
SPECIFICATIONS1
At TA = −40°C to +105°C, 5.0 V dc ± 5%, acceleration = 0 g, unless otherwise noted.
Table 1.
Parameter
SENSOR
Output Full-Scale Range
Nonlinearity
Package Alignment Error
Cross-Axis Sensitivity
Resonant Frequency
Sensitivity, Ratiometric
(Over Temperature)
OFFSET
Zero-g Output Voltage
(Over Temperature)2
NOISE
Noise Density
Clock Noise
FREQUENCY RESPONSE
−3 dB Frequency
−3 dB Frequency Drift
SELF-TEST
Output Change
(Cube vs. VDD)3
Logic Input High
Logic Input Low
Input Resistance
OUTPUT AMPLIFIER
Output Voltage Swing
Capacitive Load Drive
PREFILTER HEADROOM
CFSR @ 400 kHz
POWER SUPPLY (VDD)
Functional Range
Quiescent Supply Current
TEMPERATURE RANGE
Conditions
IOUT ≤ ±100 μA
VDD = 5 V, 100 Hz
VOUT − VDD/2,
VDD = 5 V
10 Hz − 400 Hz,
5V
2-pole Bessel
25°C to
TMIN or TMAX
VDD = 5 V
VDD = 5 V
VDD = 5 V
Pull-down
resistor to GND
IOUT = ±400 μA
VDD = 5 V
Model No. AD22279
Min Typ Max
37
−5
52.25
0.2
1
24
55
2
+5
57.75
−200
+200
1.1 3
5
360 400 440
2
440 550 660
3.5
1
30 50
0.25 VDD − 0.25
1000
280
5
4.75 5.25
3.5 6
1.3 2
−40 +105
Model No. AD22280
Min Typ Max
55
0.2 2
1
−5 +5
24
36.1 38 39.9
−150
+150
1.4 3
5
360 400 440
2
304 380 456
3.5
1
30 50
0.25 VDD − 0.25
1000
400
4
4.75 5.25
3.5 6
1.3 2
−40 +105
Model No. AD22281
Min Typ Max
70
−5
25.65
0.2
1
24
27
2
+5
28.35
−150
+150
1.8 3.5
5
360 400 440
2
216 270 324
3.5
1
30 50
0.25 VDD − 0.25
1000
560
3
4.75 5.25
3.5 6
1.3 2
−40 +105
Unit
g
%
Degree
%
kHz
mV/g
mV
mg/√Hz
mV p-p
Hz
Hz
mV
V
V
V
pF
g
V/V
V
V
mA
°C
1 All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.
2 Zero g output is ratiometric.
3 Self-test output at VDD = (Self-Test Output at 5 V) × (VDD/5 V)3.
Rev. B | Page 3 of 12

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ADXL78
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Acceleration (Any Axis, Unpowered)
Acceleration (Any Axis, Powered)
VS
All Other Pins
Output Short-Circuit Duration
(Any Pin to Common)
Operating Temperature Range
Storage Temperature
Rating
4000 g
4000 g
−0.3 V to +7.0 V
(COM − 0.3 V) to
(VS + 0.3 V)
Indefinite
−65°C to +150°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
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
Rev. B | Page 4 of 12