|
|
PDF ADXL321 Data sheet ( Hoja de datos )
| Número de pieza | ADXL321 | |
| Descripción | Small and Thin 18 g Accelerometer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADXL321 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
FEATURES
Small and thin
4 mm × 4 mm × 1.45 mm LFCSP package
3 mg resolution at 50 Hz
Wide supply voltage range: 2.4 V to 6 V
Low power: 350 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
Compatible with Sn/Pb and Pb-free solder processes
APPLICATIONS
Vibration monitoring and compensation
Abuse event detection
Sports equipment
Small and Thin ±18 g Accelerometer
ADXL321
GENERAL DESCRIPTION
The ADXL321 is a small and thin, 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 ±18 g (typical). It can also
measure both dynamic acceleration (vibration) and static
acceleration (gravity).
The ADXL321’s typical noise floor is 320 µg/√Hz, allowing
signals below 3 mg to be resolved in tilt-sensing applications
using narrow bandwidths (<50 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 may be selected to suit the application.
The ADXL321 is available in a very thin 4 mm × 4 mm ×
1.45 mm, 16-lead, plastic LFCSP.
FUNCTIONAL BLOCK DIAGRAM
+3V
VS
ADXL321
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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1, 4, 8, 9, 11, 13, 16
NC
2 ST
3, 5 to 7
COM
10 YOUT
12 XOUT
14, 15
VS
NC VS VS NC
16 15 14 13
NC 1
12 XOUT
ST 2
COM 3
ADXL321
TOP VIEW
(Not to Scale)
11 NC
10 YOUT
NC 4
567
COM COM COM
NC = NO CONNECT
9 NC
8
NC
Figure 2. Pin Configuration
Description
Do Not Connect
Self-Test
Common
Y Channel Output
X Channel Output
2.4 V to 6 V
ADXL321
Rev. 0 | Page 5 of 16
5 Page 
THEORY OF OPERATION
The ADXL321 is a complete acceleration measurement system
on a single monolithic IC. The ADXL321 has a measurement
range of ±18 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
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 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.
ADXL321
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.
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques have been used to ensure
high performance is built-in. As a result, there is neither
quantization error nor nonmonotonic behavior, and
temperature hysteresis is very low (typically less than 10 mg
over the −20°C to +70°C temperature range).
Figure 10 shows the zero g output performance of eight parts
(X- and Y-axis) over a −20°C to +70°C temperature range.
Figure 13 demonstrates the typical sensitivity shift over
temperature 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 ADXL321.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADXL320 | Small and Thin 5 g Accelerometer | Analog Devices |
| ADXL321 | Small and Thin 18 g Accelerometer | Analog Devices |
| ADXL322 | Small and Thin +-2 g Accelerometer | Analog Devices |
| ADXL323 | Dual Axis Accelerometer | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |