ANALOG DEVICES ADXL327 Service Manual
Small, Low Power, 3-Axis ±2 g
V
http://www.BDTIC.com/ADI
FEATURES
3-axis sensing
Small, low profile package
4 mm × 4 mm × 1.45 mm LFCSP
Low power: 350 μA typical
Single-supply operation: 1.8 V to 3.6 V
10,000 g shock survival
Excellent temperature stability
Bandwidth adjustment with a single capacitor per axis
RoHS/WEEE lead-free compliant
APPLICATIONS
Cost-sensitive, low power, motion- and tilt-sensing applications
Mobile devices
Gaming systems
Disk drive protection
Image stabilization
Sports and health devices
Accelerometer
ADXL327
GENERAL DESCRIPTION
The ADXL327 is a small, low power, complete 3-axis accelerometer
with signal conditioned voltage outputs. The product measures
acceleration with a minimum full-scale range of ±2 g. It can
measure the static acceleration of gravity in tilt-sensing
applications, as well as dynamic acceleration, resulting from
motion, shock, or vibration.
The user selects the bandwidth of the accelerometer using
the C
, CY, and CZ capacitors at the X
X
Bandwidths can be selected to suit the application with a
range of 0.5 Hz to 1600 Hz for X and Y axes and a range of
0.5 Hz to 550 Hz for the Z axis.
The ADXL327 is available in a small, low profile, 4 mm ×
4 mm × 1.45 mm, 16-lead, plastic lead frame chip scale package
(LFCSP_LQ).
OUT
, Y
OUT
, and Z
OUT
pins.
FUNCTIONAL BLOCK DIAGRAM
+3
V
S
ADXL327
OUTPUT AMP
3-AXIS
SENSOR
C
DC
COM ST
AC AMP DEMOD
Figure 1.
OUTPUT AMP
OUTPUT AMP
~32kΩ
~32kΩ
~32kΩ
X
OUT
C
X
Y
OUT
C
Y
Z
OUT
C
Z
7949-001
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 ©2009 Analog Devices, Inc. All rights reserved.
ADXL327
http://www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 10
Mechanical Sensor ...................................................................... 10
REVISION HISTORY
8/09—Revision 0: Initial Version
Performance ................................................................................ 10
Applications Information .............................................................. 11
Power Supply Decoupling ......................................................... 11
Setting the Bandwidth Using CX, CY, and CZ .......................... 11
Self Test ........................................................................................ 11
Design Trade-Offs for Selecting Filter Characteristics: The
Noise/BW Trade-Off .................................................................. 11
Use with Operating Voltages Other Than 3 V .......................... 11
Axes of Acceleration Sensitivity ............................................... 12
Layout and Design Recommendations ................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
Rev. 0 | Page 2 of 16
ADXL327
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SPECIFICATIONS
TA = 25°C, VS = 3 V, CX = CY = CZ = 0.1 µF, acceleration = 0 g, unless otherwise noted. All minimum and maximum specifications are
guaranteed. Typical specifications are not guaranteed.
Table 1.
Parameter Conditions Min Typ Max Unit
SENSOR INPUT Each axis
Measurement Range ±2 ±2.5
Nonlinearity Percent of full scale ±0.2 %
Package Alignment Error ±1 Degrees
Interaxis Alignment Error ±0.1 Degrees
Cross Axis Sensitivity1 ±1 %
SENSITIVITY (RATIOMETRIC)2 Each axis
Sensitivity at X
Sensitivity Change Due to Temperature3 V
OUT
, Y
, Z
V
OUT
OUT
= 3 V 378 420 462 mV/g
S
= 3 V ±0.01 %/°C
S
ZERO g BIAS LEVEL (RATIOMETRIC)
0 g Voltage at X
0 g Voltage at Z
, Y
V
OUT
OUT
V
OUT
= 3 V 1.3 1.5 1.7 V
S
= 3 V 1.2 1.5 1.8 V
S
0 g Offset vs. Temperature ±1 mg/°C
NOISE PERFORMANCE
Noise Density X
OUT
, Y
OUT, ZOUT
250 μg/√Hz rms
FREQUENCY RESPONSE4
Bandwidth X
Bandwidth Z
R
Tolerance 32 ± 15% kΩ
FILT
5
, Y
OUT
OUT
No external filter 1600 Hz
OUT
5
No external filter 550 Hz
Sensor Resonant Frequency 5.5 kHz
SELF TEST6
Logic Input Low +0.6 V
Logic Input High +2.4 V
ST Actuation Current +60 μA
Output Change at X
Output Change at Y
Output Change at Z
Self test 0 to 1 −210 −450 −850 mV
OUT
Self test 0 to 1 +210 +450 +850 mV
OUT
Self test 0 to 1 +210 +770 +1400 mV
OUT
OUTPUT AMPLIFIER
Output Swing Low No load 0.1 V
Output Swing High No load 2.8 V
POWER SUPPLY
Operating Voltage Range 1.8 3.6 V
Supply Current VS = 3 V 350 μA
Turn-On Time7 No external filter 1 ms
TEMPERATURE
Operating Temperature Range −40 +85 °C
1
Defined as coupling between any two axes.
2
Sensitivity is essentially ratiometric to VS.
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 filter capacitors (CX, CY, CZ).
5
Bandwidth with external capacitors = 1/(2 × π × 32 kΩ × C). For CX, CY = 0.003 μF, bandwidth = 1.6 kHz. For CZ = 0.01 μF, bandwidth = 500 Hz. For CX, CY, CZ = 10 μF,
bandwidth = 0.5 Hz.
6
Self test response changes cubically with VS.
7
Turn-on time is dependent on CX, CY, CZ and is approximately 160 × CX or CY or CZ + 1 ms, where CX, CY, CZ are in μF.
g
Rev. 0 | Page 3 of 16
ADXL327
http://www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Acceleration (Any Axis, Unpowered) 10,000 g
Acceleration (Any Axis, Powered) 10,000 g
VS −0.3 V to +3.6 V
All Other Pins (COM − 0.3 V) to (VS + 0.3 V)
Output Short-Circuit Duration
(Any Pin to Common)
Temperature Range (Powered) −55°C to +125°C
Temperature Range (Storage) −65°C to +150°C
Indefinite
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. 0 | Page 4 of 16
ADXL327
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
S
V
14
ADXL327
TOP VIEW
+Z
+X
S
NC
13
12
X
OUT
11
+Y
NC
10
Y
OUT
9
NC
NC
COM
NC
1
2
ST
3
4
NC15V
16
(Not to Scale)
5678
COM
COM
NC = NO CONNECT
OUT
COM
Z
07949-003
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 NC No Connect (or Optionally Ground)
2 ST Self Test
3 COM Common
4 NC No Connect
5 COM Common
6 COM Common
7 COM Common
8 Z
Z Channel Output
OUT
9 NC No Connect (or Optionally Ground)
10 Y
Y Channel Output
OUT
11 NC No Connect
12 X
X Channel Output
OUT
13 NC No Connect
14 V
S
Supply Voltage (1.8 V to 3.6 V)
15 VS Supply Voltage (1.8 V to 3.6 V)
16 NC No Connect
EP Exposed pad Not internally connected. Solder for mechanical integrity.
Rev. 0 | Page 5 of 16
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