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PDF ADXL322 Data sheet ( Hoja de datos )
| Número de pieza | ADXL322 | |
| Descripción | Small and Thin +-2 g Accelerometer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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.
1 page  
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
5 Page 
THEORY OF OPERATION
The ADXL322 is a complete acceleration measurement system
on a single monolithic IC. The ADXL322 has a measurement
range of ±2 g. 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 measures static acceleration forces, such as
gravity, which allows it to be used as a tilt sensor.
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
measured using a differential capacitor that consists of inde-
pendent fixed plates and plates attached to the moving mass.
The fixed plates are driven by 180° out-of-phase square waves.
Acceleration deflects the beam and unbalances the differential
capacitor, resulting in an output square wave whose amplitude
is proportional to acceleration. Phase-sensitive demodulation
techniques are then used to rectify the signal and determine
the direction of the acceleration.
The demodulator’s output is amplified and brought off-
chip through a 32 kΩ resistor. The user then sets the signal
bandwidth of the device by adding a capacitor. This filtering
improves measurement resolution and helps prevent aliasing.
ADXL322
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques were used to ensure
built-in high performance. As a result, there is neither quanti-
zation error nor nonmonotonic behavior, and temperature
hysteresis is very low (typically less than 5 mg over the −20°C
to +70°C temperature range).
Figure 11 shows the zero g output performance of eight parts
(X- and Y-axis) over a −20°C to +70°C temperature range.
Figure 14 demonstrates the typical sensitivity shift over tem-
perature for supply voltages of 3 V. This is typically better than
±1% over the −20°C to +70°C temperature range.
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADXL322.PDF ] | |
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