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ADXL320
Datasheet
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Analog Devices ADXL320 Datasheet

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 5.25 V Low power: 350 µA at V 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 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
= 2.4 V (typ)
S
Small and Thin ±5 g Accelerometer
ADXL320

GENERAL DESCRIPTION

The ADXL320 is a low cost, low power, complete dual-axis accelerometer with signal conditioned voltage outputs, which is all on a single monolithic IC. The product measures acceleration with a full-scale range of ±5 g (typical). It can also measure both dynamic acceleration (vibration) and static acceleration (gravity).
The ADXL320’s typical noise floor is 250 µg/√Hz, allowing 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 C
0.5 Hz to 2.5 kHz may be selected to suit the application.
The ADXL320 is available in a very thin 4 mm × 4 mm ×
1.45 mm, 16-lead, plastic LFCSP.
and CY at the X
X
OUT
and Y
pins. Bandwidths of
OUT

FUNCTIONAL BLOCK DIAGRAM

+3V
V
S
ADXL320
C
DC
SENSOR
COM ST
Rev. 0
AC
AMP
DEMOD
Figure 1.
OUTPUT
AMP
R
FILT
32kΩ
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
OUTPUT
AMP
R
FILT
32kΩ
Y
OUT
C
Y
X
OUT
C
X
04993-001
www.analog.com
ADXL320

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
9/04—Revision 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
Use with Operating Voltages Other than 3 V............................. 13
Use as a Dual-Axis Tilt Sensor ................................................. 13
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 14
.................................................................. 12
Rev. 0 | Page 2 of 16
ADXL320
, Y
, Y
OUT
OUT
OUT
4
, Y
1
2
OUT
g
Each axis VS = 3 V 156 174 192 mV/g
3
VS = 3 V 0.01 %/°C
VS = 3 V 1.3 1.5 1.7 V
0.002 10 µF
Self-test 0 to 1 55 mV
20 ms

SPECIFICATIONS

TA = 25°C, VS = 3 V, CX = CY = 0.1 µF, Acceleration = 0 g, unless otherwise noted.
Table 1.
Parameter Conditions Min Typ Max Unit
SENSOR INPUT Each axis
Measurement Range ±5
Nonlinearity % of full scale ±0.2 %
Package Alignment Error ±1 Degrees
Alignment Error X sensor to Y sensor ±0.1 Degrees
Cross Axis Sensitivity ±2 % SENSITIVITY (RATIOMETRIC)
Sensitivity at X
Sensitivity Change due to Temperature ZERO g BIAS LEVEL (RATIOMETRIC) Each axis
0 g Voltage at X
0 g Offset Versus Temperature ±0.6 mg/°C NOISE PERFORMANCE
Noise Density @ 25°C 250 µg/√Hz rms FREQUENCY RESPONSE
CX, CY Range
R
Tolerance 32 ± 15% kΩ
FILT
Sensor Resonant Frequency 5.5 kHz SELF-TEST
Logic Input Low 0.6 V
Logic Input High 2.4 V
ST Input Resistance to Ground 50 kΩ
Output Change at X OUTPUT AMPLIFIER
Output Swing Low No load 0.3 V
Output Swing High No load 2.5 V POWER SUPPLY
Operating Voltage Range 2.4 5.25 V
Quiescent Supply Current 0.48 mA
Turn-On Time TEMPERATURE
Operating Temperature Range −20 70 °C
OUT
OUT
5
6
7
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 154 mV/V/g to 194 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
ADXL320

ABSOLUTE MAXIMUM RATINGS

Table 2.
Parameter Rating
Acceleration (Any Axis, Unpowered) 10,000 g Acceleration (Any Axis, Powered) 10,000 g V
S
All Other Pins
Output Short-Circuit Duration (Any Pin to Common) Indefinite
Operating Temperature Range −55°C to +125°C Storage Temperature −65°C to +150°C
−0.3 V to +7.0 V (COM − 0.3 V) to
+ 0.3 V)
(V
S

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.
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.
Rev. 0 | Page 4 of 16
ADXL320
T

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NC VSVSNC
NC X
ST
COM
NC NC
NC = NO CONNEC
ADXL320
TOP VIEW
(Not to Scale)
COM COM COM NC
Figure 2. Pin Configuration
NC
Y
OUT
OUT
04993-022
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 NC Do Not Connect 2 ST Self-Test 3 COM Common 4 NC Do Not Connect 5 COM Common 6 COM Common 7 COM Common 8 NC Do Not Connect 9 NC Do Not Connect 10 Y
OUT
Y Channel Output 11 NC Do Not Connect 12 X
OUT
X Channel Output 13 NC Do Not Connect 14 V 15 V
S
S
2.4 V to 5.25 V
2.4 V to 5.25 V
16 NC Do Not Connect
Rev. 0 | Page 5 of 16
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