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  • Small, Low Power, 3-Axis3 g

    A cc e l e r o m e t e r AD X L 335

    FEATURES3-axis sensingSmall, low profile package4 mm 4 mm 1.45 mm

    LFCSP Low power : 350 A (typical)Single-supply operation: 1.8 V to 3.6V 10,000 g shock survivalExcellent temperature stabilityBW adjustment with a single capacitor per axis RoHS/WEEE lead-free compliant

    APPLICATIONSCost sensitive, low power, motion- and tilt-

    sensing applicationsMobile devices Gaming systems Disk drive protectionImage stabilizationSports and health devices

    GENERAL DESCRIPTIONThe ADXL335 is a small, thin, low power, complete 3-axis accel-erometer with signal conditioned voltage outputs. The product measures acceleration with a minimum full-scale rangeof 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 theCX, 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 the 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).

    FUNCTIONAL BLOCK DIAGRAM+3V

    CDC

    CZ

  • VS

    XOUTADXL335OUTPUT AMP

    ~32k

    CX3-AXISSENSOR

    OUAC AMP DEMOD OUTPUT AMP

    ~32k

    Z

    CY

    TOUOUTPUT AMP

    ~32k

    COM ST

    Figure 1.

    Rev. 0Information furnished by Analog Devices is believed to be accurate and reliable.However, no responsibility isassumed byAnalog Devices for its use,nor for anyinfringements ofpatents or other rights ofthirdparties that may result fromits use.Specifications subject to change without notice. No license is grantedbyimplicationor otherwise under anypatent or patent rights of Analog Devices. Trademarks andregisteredtrademarks arethe property oftheir 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 rightsreserved.

  • ADXL335TABLE OF CONTENTSFeatures .............................................................................................. 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

    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

    REVISION HISTORY 1/09Revision 0: Initial Version

  • Rev. 0 | Page 2 of 16

  • ADXL335SPECIFICATIONSTA = 25C, VS = 3 V, CX = CY = CZ = 0.1 F, 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 UnitSENSOR INPUT

    Measurement RangeNonlinearityPackage Alignment ErrorInteraxis AlignmentError Cross-AxisSensitivity1

    Each axis

    % of full scale3 3.6

    0.3 1 0.1 1

    g%DegreesDegrees%

    SENSITIVITY (RATIOMETRIC)2

    Sensitivity at XOUT, YOUT, ZOUT

    Each axisVS = 3 V VS = 3 V

    270 300 330 0.01

    mV/g%/C

    ZERO g BIAS LEVEL (RATIOMETRIC)0 g Voltage at XOUT, YOUT0 g Voltage at ZOUT0 g Offset vs. Temperature

    VS = 3 VVS = 3 V

    1.35 1.5 1.65 1.2 1.5 1.8

    1

    VVmg/C

    NOISE PERFORMANCE Noise Density XOUT, YOUTNoise Density ZOUT

    150300

    g/Hz rmsg/Hz rms

    FREQUENCY RESPONSE4

    Bandwidth XOUT, YOUT5

    Bandwidth ZOUT5

    RFILT ToleranceSensor Resonant Frequency

    No external filterNo external filter

    1600 55032 15%5.5

    HzHzkkHz

    SELF-TEST6

    Logic Input LowLogic Input HighST Actuation Current Output Change at XOUTOutput Change at YOUT Output Change at ZOUT

    Self-Test 0 to Self-Test1 Self-Test 0 to Self-Test 1 Self-Test 0 toSelf-Test 1

    +0.6+2.4+60

    150 325 600+150 +325 +600+150 +550 +1000

    V V A mV mV mV

    OUTPUT AMPLIFIER Output Swing Low Output Swing High

    No loadNo load

    0.12.8

    VV

    POWER SUPPLYOperating Voltage RangeSupply CurrentTurn-On Time7

    VS = 3 VNo external filter

    1.8 3.6 3501

    V A ms

    TEMPERATUREOperating 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 32 k C). For CX, CY = 0.003 F, bandwidth = 1.6 kHz. For CZ = 0.01 F, bandwidth = 500 Hz. For CX, CY, CZ =

    10 F, 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 microfarads (F).

    Rev. 0 | Page 3 of 16

  • ADXL335ABSOLUTE MAXIMUM RATINGSTable 2.Parameter RatingAcceleration (Any Axis, Unpowered) Acceleration (Any Axis, Powered) VSAll Other PinsOutput Short-Circuit Duration

    (Any Pin to Common)Temperature Range (Powered)Temperature Range (Storage)

    10,000 g10,000 g0.3 V to +3.6 V (COM 0.3 V) to (VS + 0.3 V) Indefinite

    55C to +125C65C to +150C

    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 mayaffect device reliability.

    ESD CAUTION

  • Rev. 0 | Page 4 of 16

  • ADXL335 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

    16 15 14 13

    NC 1 ADXL335 12TOP VIEW

    ST 2 (Not to Scale) 11+Y

    COM 3 +Z 10

    XOUT

    NC

    YOUT

    NC 4 +X 9 NC5 6 7 8

    NC = NO CONNECT

    NOTES1. EXPOSED PAD IS NOT INTERNALLY

    CONNECTED BUT SHOULD BE SOLDERED FOR MECHANICAL INTEGRITY.

    Figure 2. Pin Configuration

    Table 3. Pin Function DescriptionsPin No. Mnemonic Description1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 EP

    NC ST COM NC COM COM COM ZOUT NC YOUT NC XOUT NC VSVS NCExposed Pad

    No Connect1.Self-Test. Common. No Connect1.Common. Common. Common.Z Channel Output.No Connect1.Y Channel Output.No Connect1.X Channel Output.No Connect1.Supply Voltage (1.8 V to 3.6V). Supply Voltage (1.8 V to3.6 V). No Connect1.Not internally connected. Solder for mechanical integrity.

    1NC pins are not internally connected and can be tied to COM pins, unless otherwise noted.

    Rev. 0 | Page 5 of 16

  • ADXL335TYPICAL PERFORMANCE CHARACTERISTICS N > 1000 for all typical performance plots, unless otherwise noted.

    50 40

    4030

    30

    20

    20

    10 10

    01.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56 1.58

    00.40 0.38 0.36 0.34 0.32 0.30 0.28 0.26

    OUTPUT (V)

    Figure 3. X-Axis Zero g Bias at 25C, VS = 3V

    VOLTS (V)

    Figure 6. X-Axis Self-Test Response at 25C, VS = 3 V

    50 50

    40 40

    30 30

    20 20

    10 10

    01.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56 1.58

    00.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40

    OUTPUT (V)

    Figure 4. Y-Axis Zero g Bias at 25C, VS = 3 V

    VOLTS (V)

    Figure 7. Y-Axis Self-Test Response at 25C, VS = 3 V

    25 40

    2030