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ADXL335 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADXL335
Beschreibung Accelerometer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 11 Seiten
ADXL335 Datasheet, Funktion
Preliminary Technical Data
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
www.DataShee1t40U,0.c0o0mg 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, 3-Axis ±3 g
Accelerometer
ADXL335
GENERAL DESCRIPTION
The ADXL335 is a small, thin, low power, complete 3-axis
accelerometer with signal conditioned voltage outputs. 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, CY, and CZ capacitors at the XOUT, YOUT, and ZOUT pins.
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 ADXL335 is available in a small, low profile, 4 mm × 4 mm
× 1.45 mm, 16-lead, plastic lead frame chip scale package
(LFCSP_LQ).
+3V FUNCTIONAL BLOCK DIAGRAM
Vs
ADXL335
3-Axis
Sensor
Output
Amp
~32kΩ
XOUT
CX
CDC
AC
Amp
Demod
Output
Amp
~32kΩ
YOUT
CY
Output
Amp
~32kΩ
ZOUT
CZ
COM
ST
Figure 1.
Rev. PrA
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
©2008 Analog Devices, Inc. All rights reserved.






ADXL335 Datasheet, Funktion
ADXL335
THEORY OF OPERATION
The ADXL335 is a complete 3-axis acceleration measurement
system. The ADXL335 has a measurement 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 acceleration of gravity in
tilt sensing applications as well as dynamic acceleration
resulting from motion, shock, or vibration.
www.DataTShheeeste4nUs.ocromis 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.
Preliminary Technical Data
MECHANICAL SENSOR
The ADXL335 uses a single structure for sensing the X, Y, and
Z axes. As a result, the three axes sense directions are highly
orthogonal with little cross axis sensitivity. Mechanical mis-
alignment 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 high
performance is built-in to the ADXL335. 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).
Rev. PrA | Page 6 of 11

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