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PDF ADXL323 Data sheet ( Hoja de datos )
| Número de pieza | ADXL323 | |
| Descripción | Dual Axis Accelerometer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
2-axis sensing
Small, low-profile package
4 mm × 4 mm × 1.45 mm LFCSP_LQ
Low power
180 μA at VS = 1.8 V (typical)
Single-supply operation
1.8 V to 5.25 V
10,000 g shock survival
Excellent temperature stability
BW 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
Small, Low Power, 2-Axis ±3 g
i MEMS® Accelerometer
ADXL323
GENERAL DESCRIPTION
The ADXL323 is a small, thin, low power, complete 2-axis
accelerometer with signal-conditioned voltage outputs, all
on a single, monolithic IC. The product measures acceleration
with a minimum full-scale range of ±3 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
CX and CY capacitors at the XOUT and YOUT pins. Bandwidths
can be selected to suit the application, with a range of 0.5 Hz
to 1600 Hz.
The ADXL323 is available in a small, low profile, 4 mm ×
4 mm × 1.45 mm, 16-lead, plastic lead frame chip scale package
(LFCSP_LQ).
FUNCTIONAL BLOCK DIAGRAM
+3V
VS
ADXL323
CDC
2-AXIS
SENSOR
AC AMP
DEMOD
OUTPUT AMP
RFILT
XOUT
CX
OUTPUT AMP
RFILT
YOUT
CY
COM
ST
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2006 Analog Devices, Inc. All rights reserved.
1 page  
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADXL323
NC
ST
COM
NC
16 15 14 13
1 ADXL323 12
TOP VIEW
2 (Not to Scale) 11
+Y
3 10
4
5
+X
67
9
8
XOUT
NC
YOUT
NC
NC = NO CONNECT
Figure 3. Pin Configuration
0.35
MAX
0.50
MAX
4
0.65 0.325
0.65
1.95
CENTER PAD IS NOT
INTERNALLY CONNECTED
BUT SHOULD BE SOLDERED
FOR MECHANICAL INTEGRITY
4
0.325
1.95
DIMENSIONS SHOWN IN MILLIMETERS
Figure 4. Recommended PCB Layout
Table 4. 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
Description
No Connect
Self Test
Common
No Connect
Common
Common
Common
No Connect
No Connect
Y Channel Output
No Connect
X Channel Output
No Connect
Supply Voltage (1.8 V to 5.25 V)
Supply Voltage (1.8 V to 5.25 V)
No Connect
Rev. 0 | Page 5 of 16
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THEORY OF OPERATION
The ADXL323 is a complete 2-axis acceleration measurement
system on a single, monolithic IC. The ADXL323 has a measure-
ment range of ±3 g minimum. It contains a polysilicon surface
micromachined sensor and signal conditioning circuitry to
implement an open-loop acceleration measurement architecture.
The output signals are analog voltages that are proportional to
acceleration. The accelerometer can measure the static accelera-
tion of gravity in tilt sensing applications, as well as dynamic
acceleration resulting from motion, shock, or vibration.
The sensor is a polysilicon surface micromachined structure
built on top of a silicon wafer. Polysilicon springs suspend the
structure over the surface of the wafer and provide a resistance
against acceleration forces. Deflection of the structure is meas-
ured using a differential capacitor that consists of independent
fixed plates and plates attached to the moving mass. The fixed
plates are driven by 180° out-of-phase square waves. Acceleration
deflects the moving mass and unbalances the differential
capacitor resulting in a sensor output whose amplitude is
proportional to acceleration. Phase-sensitive demodulation
techniques are then used to determine the magnitude and
direction of the acceleration.
The demodulator output is amplified and brought off-chip
through a 32 kΩ resistor. The user then sets the signal band-
width of the device by adding a capacitor. This filtering improves
measurement resolution and helps prevent aliasing.
ADXL323
MECHANICAL SENSOR
The ADXL323 uses a single structure for sensing the X-axis and
Y-axis. As a result, the sense directions of the two axes are
highly orthogonal with little cross axis sensitivity. Mechanical
misalignment of the sensor die to the package is the chief
source of cross axis sensitivity. Mechanical misalignment can, of
course, be calibrated out at the system level.
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques ensure that high
performance is built in to the ADXL323. As a result, there is
neither quantization error nor nonmonotonic behavior, and
temperature hysteresis is very low (typically less than 3 mg over
the −25°C to +70°C temperature range).
Figure 13 and Figure 16 show the zero g output performance of
eight parts (X-axis and Y-axis) soldered to a PCB over a −25°C
to +70°C temperature range.
Figure 25 and Figure 28 demonstrate the typical sensitivity shift
over temperature for supply voltages of 3 V. This is typically
better than ±1% over the −25°C to +70°C temperature range.
Rev. 0 | Page 11 of 16
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADXL323.PDF ] | |
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