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Small and Thin ±2 g Accelerometer
ADXL322
FEATURES
Small and thin
4 mm × 4 mm × 1.45 mm LFCSP package
2 mg resolution at 60 Hz
Wide supply voltage range: 2.4 V to 6 V
Low power: 340 μA at VS = 2.4 V (typ)
Good zero g bias stability
Good sensitivity accuracy
X-axis and Y-axis aligned to within 0.1° (typ)
BW adjustment with a single capacitor
Single-supply operation
10,000 g shock survival
Pb Free: Compatible with Sn/Pb and Pb-free solder processes
APPLICATIONS
Cost-sensitive motion- and tilt-sensing applications
Smart hand-held devices
Mobile phones
Sports and health-related devices
PC security and PC peripherals
GENERAL DESCRIPTION
The ADXL322 is a small, thin, low power, complete, dual-axis
accelerometer with signal conditioned voltage outputs, which
are all on a single monolithic IC. The product measures accel-
eration with a full-scale range of ±2 g (typical). It can also
measure both dynamic acceleration (vibration) and static
acceleration (gravity).
The ADXL322’s typical noise floor is 220 μg/√Hz, which allows
signals below 2 mg to be resolved in tilt-sensing applications
using narrow bandwidths (<60 Hz).
The user selects the bandwidth of the accelerometer using
capacitors CX and CY at the XOUT and YOUT pins. Bandwidths
of 0.5 Hz to 2.5 kHz can be selected to suit the application.
The ADXL322 is available in a 4 mm × 4 mm × 1.45 mm,
16-lead, plastic LFCSP.
FUNCTIONAL BLOCK DIAGRAM
+3V
VS
ADXL322
CDC
SENSOR
COM
AC
AMP
DEMOD
OUTPUT
AMP
OUTPUT
AMP
RFILT
32kΩ
RFILT
32kΩ
ST
YOUT
XOUT
CY CX
Figure 1.
Rev. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.

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ADXL322
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics (VS = 3.0 V) ....................... 7
Theory of Operation ...................................................................... 11
Performance ................................................................................ 11
Applications..................................................................................... 12
Power Supply Decoupling ......................................................... 12
REVISION HISTORY
6/05Revision 0: Initial Version
Setting the Bandwidth Using CX and CY ................................. 12
Self-Test ....................................................................................... 12
Design Trade-Offs for Selecting Filter Characteristics: The
Noise/BW Trade-Off.................................................................. 12
Use with Operating Voltages Other than 3 V............................. 13
Use as a Dual-Axis Tilt Sensor ................................................. 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
Rev. 0 | Page 2 of 16

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ADXL322
SPECIFICATIONS
TA = 25°C, VS = 3 V, CX = CY = 0.1 μF, Acceleration = 0 g, unless otherwise noted1.
Table 1.
Parameter
SENSOR INPUT
Measurement Range
Nonlinearity
Package Alignment Error
Alignment Error
Cross-Axis Sensitivity
SENSITIVITY (RATIOMETRIC)2
Sensitivity at XOUT, YOUT
Sensitivity Change due to Temperature3
ZERO g BIAS LEVEL (RATIOMETRIC)
0 g Voltage at XOUT, YOUT
Initial 0 g Bias Deviation from Ideal
0 g Offset Vs. Temperature
NOISE PERFORMANCE
Noise Density
FREQUENCY RESPONSE4
CX, CY Range5
RFILT Tolerance
Sensor Resonant Frequency
SELF-TEST6
T
Logic Input Low
Logic Input High
ST Input Resistance to Ground
Output Change at XOUT, YOUT
OUTPUT AMPLIFIER
Output Swing Low
Output Swing High
POWER SUPPLY
Operating Voltage Range
Quiescent Supply Current
Turn-On Time7
TEMPERATURE
Operating Temperature Range
Conditions
Each axis
% of full scale
X sensor to Y sensor
Each axis
VS = 3 V
VS = 3 V
Each axis
VS = 3 V
Min
378
1.3
at 25°C
0.002
Self-test 0 to 1
No load
No load
2.4
−20
Typ
±2
±0.2
±1
±0.1
±2
420
0.01
1.5
±50
<±0.5
220
32 ± 15%
5.5
0.6
2.4
50
125
0.2
2.7
0.45
20
Max
462
1.7
10
6
70
Unit
g
%
Degrees
Degrees
%
mV/g
%/°C
V
mg
mg/°C
μg/√Hz rms
μF
kHz
V
V
mV
V
V
V
mA
ms
°C
1 All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.
2 Sensitivity is essentially ratiometric to VS. For VS = 2.7 V to 3.3 V, sensitivity is 138 mV/V/g to 142 mV/V/g typical.
3 Defined as the output change from ambient-to-maximum temperature or ambient-to-minimum temperature.
4 Actual frequency response controlled by user-supplied external capacitor (CX, CY).
5 Bandwidth = 1/(2 × π × 32 kΩ × C). For CX, CY = 0.002 μF, bandwidth = 2500 Hz. For CX, CY = 10 μF, bandwidth = 0.5 Hz. Minimum/maximum values are not tested.
6 Self-test response changes cubically with VS.
7 Larger values of CX, CY increase turn-on time. Turn-on time is approximately 160 × CX or CY + 4 ms, where CX, CY are in μF.
Rev. 0 | Page 3 of 16

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ADXL322
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Acceleration (Any Axis, Unpowered)
Acceleration (Any Axis, Powered)
10,000 g
10,000 g
VS
All Other Pins
Output Short-Circuit Duration
(Any Pin to Common)
−0.3 V to +7.0 V
(COM − 0.3 V) to
(VS + 0.3 V)
Indefinite
Operating Temperature Range
−55°C to +125°C
Storage Temperature
−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
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.
Rev. 0 | Page 4 of 16

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1 NC
2 ST
3 COM
4 NC
5 COM
6 COM
7 COM
8 NC
9 NC
10 YOUT
11 NC
12 XOUT
13 NC
14 VS
15 VS
16 NC
NC VS VS NC
NC
ST
COM
NC
ADXL322
TOP VIEW
(Not to Scale)
XOUT
NC
YOUT
NC
COM COM COM NC
NC = NO CONNECT
Figure 2. Pin Configuration
Description
Do Not Connect
Self-Test
Common
Do Not Connect
Common
Common
Common
Do Not Connect
Do Not Connect
Y-Channel Output
Do Not Connect
X-Channel Output
Do Not Connect
2.4 V to 6 V
2.4 V to 6 V
Do Not Connect
0.350
MAX
0.600
MAX
0.650
4.000
0.325
1.950
0.650
0.325
4.000
1.950
Figure 3. 4 mm × 4 mm 16- pad LFCSP Recommended Pad Layout
Rev. 0 | Page 5 of 16
ADXL322