Small, Low Power, 3-Axis ±3 g Accelerometer ADXL337 FEATURES GENERAL DESCRIPTION 3-axis sensing Small, low profile package 3 mm × 3 mm × 1.45 mm LFCSP Low power: 300 μA (typical) Single-supply operation: 1.8 V to 3.6 V 10,000 g shock survival Excellent temperature stability Bandwidth adjustment with a single capacitor per axis RoHS/WEEE and lead-free compliant The ADXL337 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 tiltsensing 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. APPLICATIONS The ADXL337 is available in a small, low profile, 3 mm × 3 mm × 1.45 mm, 16-lead, lead frame chip scale package (LFCSP_LQ). Cost-sensitive, low power, motion- and tilt-sensing applications Mobile devices Gaming systems Disk drive protection Image stabilization Sports and health devices FUNCTIONAL BLOCK DIAGRAM +3V VS ADXL337 OUTPUT AMPLIFIERS AC AMPLIFIER CDC DEMODULATOR ~32kΩ XOUT CX ~32kΩ YOUT CY 3-AXIS SENSOR ~32kΩ ZOUT CZ ST 09358-001 GND 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 ©2010 Analog Devices, Inc. All rights reserved. ADXL337 TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 11 Applications ....................................................................................... 1 Power Supply Decoupling ......................................................... 11 General Description ......................................................................... 1 Setting the Bandwidth Using CX, CY, and CZ .......................... 11 Functional Block Diagram .............................................................. 1 Self Test ........................................................................................ 11 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Design Trade-Offs for Selecting Filter Characteristics: The Noise/BW Trade-Off .................................................................. 11 Absolute Maximum Ratings............................................................ 4 Use with Operating Voltages Other than 3 V ............................ 12 ESD Caution .................................................................................. 4 Axes of Acceleration Sensitivity ............................................... 12 Pin Configuration and Function Descriptions ............................. 5 Layout and Design Recommendations ................................... 13 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 14 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 14 Mechanical Sensor...................................................................... 10 Performance ................................................................................ 10 REVISION HISTORY 10/10—Revision 0: Initial Version Rev. 0 | Page 2 of 16 ADXL337 SPECIFICATIONS TA = 25°C, VS = 3 V, CX = CY = CZ = 0.1 μF, acceleration = 0 g, unless otherwise noted. All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. Table 1. Parameter SENSOR INPUT Measurement Range Nonlinearity Package Alignment Error Interaxis Alignment Error Cross-Axis Sensitivity 1 SENSITIVITY (RATIOMETRIC) 2 Sensitivity at XOUT, YOUT, ZOUT Sensitivity Change Due to Temperature 3 0 g BIAS LEVEL (RATIOMETRIC) 0 g Voltage at XOUT, YOUT 0 g Voltage at ZOUT 0 g Offset vs. Temperature XOUT, YOUT 0 g Offset vs. Temperature ZOUT NOISE PERFORMANCE Noise Density XOUT, YOUT Noise Density ZOUT FREQUENCY RESPONSE 4 Bandwidth XOUT, YOUT 5 Bandwidth ZOUT5 RFILT Tolerance Sensor Resonant Frequency SELF TEST 6 Logic Input Low Logic Input High ST Actuation Current Output Change at XOUT Output Change at YOUT Output Change at ZOUT OUTPUT AMPLIFIER Output Swing Low Output Swing High POWER SUPPLY Operating Voltage Range 7 Supply Current Turn-On Time 8 TEMPERATURE Operating Temperature Range Test Conditions/Comments Each axis Min Typ ±3 ±3.6 ±0.3 ±1 ±0.1 ±1 Each axis VS = 3 V VS = 3 V 270 300 ±0.01 330 mV/g %/°C VS = 3 V VS = 3 V 1.35 1.2 1.5 1.5 ±1.1 ±1.6 1.65 1.8 V V mg/°C mg/°C % of full scale No external filter No external filter Self test 0 to 1 Self test 0 to 1 Self test 0 to 1 −150 +150 +150 No load No load Max g % Degrees Degrees % 175 300 μg/√Hz rms μg/√Hz rms 1600 550 32 ± 15% 5.5 Hz Hz kΩ kHz 0.6 2.4 60 −325 +325 +550 V V μA mV mV mV −600 +600 +1000 0.1 2.8 1.8 VS = 3 V No external filter −40 1 Unit 3.0 300 1 V V 3.6 V μA ms +85 °C Defined as coupling between any two axes. Sensitivity is essentially ratiometric to VS. 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 × π × 32 kΩ × C). For CX, CY = 0.003 μF, bandwidth = 1.6 kHz. For CZ = 0.01 μF, bandwidth = 500 Hz. For CX, CY, CZ = 10 μF, bandwidth = 0.5 Hz. 6 Self test response changes cubically with VS. 7 Tested at 3.0 V and guaranteed by design only (not tested) to work over the full range from 1.8 V to 3.6 V. 8 Turn-on time is dependent on CX, CY, CZ and is approximately 160 × (CX or CY or CZ) + 1, where CX, CY, and CZ are in μF and the resulting turn-on time is in ms. 2 3 Rev. 0 | Page 3 of 16 ADXL337 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Acceleration (Any Axis, Unpowered) Acceleration (Any Axis, Powered) VS All Other Pins Output Short-Circuit Duration (Any Pin to Common) Temperature Range (Powered) Temperature Range (Storage) Rating 10,000 g 10,000 g −0.3 V to +3.6 V (GND − 0.3 V) to (VS + 0.3 V) Indefinite −55°C to +125°C −65°C to +150°C 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 may affect device reliability. ESD CAUTION Rev. 0 | Page 4 of 16 ADXL337 1 ST 2 VS VS NC 16 15 14 13 ADXL337 TOP VIEW (Not to Scale) 12 NC 11 NC 10 NC 9 NC +Y +X 5 6 7 8 NC 4 GND YOUT +Z GND 3 XOUT RES 09358-003 RES ZOUT PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NOTES 1. NC = NO CONNECT. 2. EXPOSED PAD IS NOT INTERNALLY CONNECTED BUT SHOULD BE SOLDERED FOR MECHANICAL INTEGRITY. Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1, 3 2 4 5 6, 7 8 to 13 14 15 16 Mnemonic RES ST YOUT XOUT GND NC VS VS ZOUT EPAD Description Reserved. This pin must be connected to GND or left open. Self Test. Y Channel Output. X Channel Output. Must be connected to ground. Not internally connected. Supply Voltage (3.0 V typical). Supply Voltage (3.0 V typical). Z Channel Output. Exposed Pad. Not internally connected but should be soldered for mechanical integrity. Rev. 0 | Page 5 of 16 ADXL337 TYPICAL PERFORMANCE CHARACTERISTICS N > 250 for all typical performance plots, unless otherwise noted. (N is the number of parts tested and used to produce the histograms.) 25 45 PERCENT OF POPULATION PERCENT OF POPULATION 40 20 15 10 5 35 30 25 20 15 10 5 0 OUTPUT CHANGE DUE TO SELF TEST (V) Figure 3. X-Axis Zero g Bias at 25°C, VS = 3 V 09358-008 –0.25 –0.26 –0.27 –0.28 –0.29 –0.30 –0.31 –0.32 –0.33 –0.34 –0.35 OUTPUT (V) 09358-005 1.40 1.41 1.42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 1.60 0 Figure 6. X-Axis Self-Test Response at 25°C, VS = 3 V 25 45 20 PERCENT OF POPULATION PERCENT OF POPULATION 40 15 10 5 35 30 25 20 15 10 5 0 0.18 0.19 0.20 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 OUTPUT CHANGE DUE TO SELF TEST (V) 09358-009 OUTPUT (V) 09358-006 1.40 1.41 1.42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 1.60 0 Figure 7. Y-Axis Self-Test Response at 25°C, VS = 3 V Figure 4. Y-Axis Zero g Bias at 25°C, VS = 3 V 60 18 16 PERCENT OF POPULATION 12 10 8 6 4 40 30 20 10 0 OUTPUT (V) 09358-007 0 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60 0.62 0.64 OUTPUT CHANGE DUE TO SELF TEST (V) Figure 8. Z-Axis Self-Test Response at 25°C, VS = 3 V Figure 5. Z-Axis Zero g Bias at 25°C, VS = 3 V Rev. 0 | Page 6 of 16 09358-010 2 1.40 1.41 1.42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 1.60 PERCENT OF POPULATION 50 14 45 1.60 40 1.58 1.56 35 1.54 OUTPUT (V) 30 25 20 15 1.50 1.48 09358-011 1.00 0.75 0.50 0 0.25 –0.25 –0.50 –0.75 –1.00 –1.25 –1.50 –1.75 1.40 –40 –2.00 1.42 0 –2.25 1.44 5 Figure 9. X-Axis Zero g Bias Temperature Coefficient, VS = 3 V –20 0 20 40 60 80 100 TEMPERATURE (°C) 09358-014 1.46 TEMPERATURE COEFFICIENT (mg/°C) Figure 12. X-Axis Zero g Bias vs. Temperature—Eight Parts Soldered to PCB 35 1.60 1.58 30 1.56 25 1.54 OUTPUT (V) PERCENT OF POPULATION 1.52 10 –2.50 PERCENT OF POPULATION ADXL337 20 15 1.52 1.50 1.48 1.46 10 1.44 5 TEMPERATURE COEFFICIENT (mg/°C) 1.40 –40 09358-012 1.00 0.75 0.50 0.25 0 –0.25 –0.50 –0.75 –1.00 –1.25 –1.50 –1.75 –2.00 –2.25 –2.50 0 Figure 10. Y-Axis Zero g Bias Temperature Coefficient, VS = 3 V –20 0 20 40 60 80 100 TEMPERATURE (°C) 09358-015 1.42 Figure 13. Y-Axis Zero g Bias vs. Temperature—Eight Parts Soldered to PCB 30 1.60 1.58 1.56 1.54 OUTPUT (V) 20 15 10 1.52 1.50 1.48 1.46 1.44 5 1.40 –60 Figure 11. Z-Axis Zero g Bias Temperature Coefficient, VS = 3 V 09358-013 3.0 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –2.5 TEMPERATURE COEFFICIENT (mg/°C) –40 –20 0 20 40 TEMPERATURE (°C) 60 80 100 09358-016 1.42 0 –3.0 PERCENT OF POPULATION 25 Figure 14. Z-Axis Zero g Bias vs. Temperature—Eight Parts Soldered to PCB Rev. 0 | Page 7 of 16 ADXL337 50 0.33 0.32 40 35 SENSITIVITY (V/g) PERCENT OF POPULATION 45 30 25 20 15 0.31 0.30 0.29 10 0.28 0.317 SENSITIVITY (V/g) 0.27 –40 0 20 40 60 80 100 TEMPERATURE (°C) Figure 18. X-Axis Sensitivity vs. Temperature, Eight Parts Soldered to PCB, VS = 3 V Figure 15. X-Axis Sensitivity at 25°C, VS = 3 V 60 0.33 50 0.32 40 0.31 SENSITIVITY (V/g) 30 20 10 0.30 0.29 0.320 SENSITIVITY (V/g) 0.27 –40 –20 0 09358-018 0.317 0.314 0.311 0.308 0.305 0.302 0.299 0.296 0.293 0.290 0 20 40 60 80 100 09358-021 0.28 100 09358-022 PERCENT OF POPULATION –20 09358-017 0.314 0.311 0.308 0.305 0.302 0.299 0.296 0.293 0.290 0 09358-020 5 TEMPERATURE (°C) Figure 16. Y-Axis Sensitivity at 25°C, VS = 3 V Figure 19. Y-Axis Sensitivity vs. Temperature, Eight Parts Soldered to PCB, VS = 3 V 50 0.33 45 0.32 SENSITIVITY (V/g) 35 30 25 20 15 10 0.31 0.30 0.29 0.28 5 0.27 –40 0.320 09358-019 SENSITIVITY (V/g) 0.317 0.314 0.311 0.308 0.305 0.302 0.299 0.296 0.293 0 0.290 PERCENT OF POPULATION 40 –20 0 20 40 60 80 TEMPERATURE (°C) Figure 20. Z-Axis Sensitivity vs. Temperature, Eight Parts Soldered to PCB, VS = 3 V Figure 17. Z-Axis Sensitivity at 25°C, VS = 3 V Rev. 0 | Page 8 of 16 ADXL337 400 CX = CY = CZ = 0.001µF 350 ZOUT, 500mV/DIV 250 200 YOUT, 500mV/DIV 150 50 0 1.5 POWER, 1V/DIV 2.0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) OUTPUTS ARE OFFSET FOR CLARITY TIME (1ms/DIV) Figure 22. Typical Turn-On Time, VS = 3 V Figure 21. Typical Current Consumption vs. Supply Voltage Rev. 0 | Page 9 of 16 09358-024 XOUT, 500mV/DIV 100 09358-023 CURRENT (µA) 300 ADXL337 THEORY OF OPERATION The ADXL337 is a complete 3-axis acceleration measurement system. The ADXL337 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. 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 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. MECHANICAL SENSOR The ADXL337 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 misalignment of the sensor die to the package is the chief source of cross-axis sensitivity. Mechanical misalignment can be calibrated out at the system level. PERFORMANCE Rather than using additional temperature compensation circuitry, innovative design techniques ensure that high performance is built into the ADXL337. 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 +85°C temperature range). The demodulator output is amplified and brought off chip through a 32 kΩ resistor. The user then sets the signal bandwidth (BW) of the device by adding a capacitor. This filtering improves measurement resolution and helps prevent aliasing. Rev. 0 | Page 10 of 16 ADXL337 APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING For most applications, a single 0.1 μF capacitor, CDC, placed close to the ADXL337 supply pins adequately decouples the accelerometer from noise on the power supply. However, in applications where noise is present at the 50 kHz internal clock frequency (or any harmonic thereof), additional care in power supply bypassing is required because this noise can cause errors in acceleration measurement. If additional decoupling is needed, a 100 Ω (or smaller) resistor or ferrite bead can be inserted in the supply line. Additionally, a larger bulk bypass capacitor (1 μF or greater) can be added in parallel to CDC. Ensure that the connection from the ADXL337 ground to the power supply ground is low impedance because noise transmitted through ground has a similar effect as noise transmitted through VS. SETTING THE BANDWIDTH USING CX, CY, AND CZ The ADXL337 has provisions for band limiting the XOUT, YOUT, and ZOUT pins. Capacitors must be added at these pins to implement low-pass filtering for antialiasing and noise reduction. The equation for the 3 dB bandwidth is f−3 dB = 1/(2π(32 kΩ) × C(X, Y, Z)) DESIGN TRADE-OFFS FOR SELECTING FILTER CHARACTERISTICS: THE NOISE/BW TRADE-OFF The selected accelerometer bandwidth ultimately determines the measurement resolution (smallest detectable acceleration). Filtering can be used to lower the noise floor to improve the resolution of the accelerometer. Resolution is dependent on the analog filter bandwidth at XOUT, YOUT, and ZOUT. The output of the ADXL337 has a typical bandwidth of greater than 500 Hz. The user must filter the signal at this point to limit aliasing errors. The analog bandwidth must be no more than half the analog-to-digital sampling frequency to minimize aliasing. The analog bandwidth can be decreased further to reduce noise and improve resolution. The ADXL337 noise has the characteristics of white Gaussian noise, which contributes equally at all frequencies and is described in terms of μg/√Hz (the noise is proportional to the square root of the accelerometer bandwidth). The user should limit bandwidth to the lowest frequency needed by the application to maximize the resolution and dynamic range of the accelerometer. With the single-pole, roll-off characteristic, the typical noise of the ADXL337 is determined by or more simply rms Noise = Noise Density × ( BW × 1.6 ) f–3 dB = 5 μF/C(X, Y, Z) The tolerance of the internal resistor (RFILT) typically varies as much as ±15% of its nominal value (32 kΩ), and the bandwidth varies accordingly. A minimum capacitance of 0.0047 μF for CX, CY, and CZ is recommended in all cases. It is often useful to know the peak value of the noise. Peak-to-peak noise can only be estimated by statistical methods. Table 5 is useful for estimating the probabilities of exceeding various peak values, given the rms value. Table 4. Filter Capacitor Selection, CX, CY, and CZ Table 5. Estimation of Peak-to-Peak Noise Bandwidth (Hz) 1 10 50 100 200 500 Peak-to-Peak Value 2 × rms 4 × rms 6 × rms 8 × rms Capacitor (μF) 4.7 0.47 0.10 0.05 0.027 0.01 SELF TEST The ST pin controls the self test feature. When this pin is set to VS, an electrostatic force is exerted on the accelerometer beam. The resulting movement of the beam allows the user to test if the accelerometer is functional. The typical change in output is −1.08 g (corresponding to −325 mV) in the X-axis, +1.08 g (or +325 mV) on the Y-axis, and +1.83 mg (or +550 mV) on the Z-axis. This ST pin can be left open circuit or connected to common (GND) in normal use. Never expose the ST pin to voltages greater than VS + 0.3 V. If this cannot be guaranteed due to the system design (for instance, if there are multiple supply voltages), then a low VF clamping diode between ST and VS is recommended. Rev. 0 | Page 11 of 16 Percent of Time that Noise Exceeds Nominal Peak-to-Peak Value 32 4.6 0.27 0.006 ADXL337 The ADXL337 is tested and specified at VS = 3 V; however, it can be powered with VS as low as 1.8 V or as high as 3.6 V. Note that some performance parameters change as the supply voltage is varied. The ADXL337 output is ratiometric; therefore, the output sensitivity (or scale factor) varies proportionally to the supply voltage. At VS = 3.6 V, the output sensitivity is typically 360 mV/g. At VS = 2 V, the output sensitivity is typically 195 mV/g. At VS = 2 V, the self test response is approximately −96 mV for the X-axis, +96 mV for the Y-axis, and −163 mV for the Z-axis. The supply current decreases as the supply voltage decreases. Typical current consumption at VS = 3.6 V is 375 μA, and typical current consumption at VS = 2 V is 200 μA. AXES OF ACCELERATION SENSITIVITY The axes of sensitivity for the accelerometer are shown in Figure 23, and Figure 24 shows the output response when the accelerometer is oriented parallel to each of these axes. The zero g bias output is also ratiometric; therefore, the zero g output is nominally equal to VS/2 at all supply voltages. AZ The output noise is not ratiometric but is absolute in volts; therefore, the noise density decreases as the supply voltage increases. This is because the scale factor (mV/g) increases while the noise voltage remains constant. At VS = 3.6 V, the Xand Y-axis noise density is typically 120 μg/√Hz, and at VS = 2 V, the X- and Y-axis noise density is typically 270 μg/√Hz. Self test response in g is roughly proportional to the square of the supply voltage. However, when ratiometricity of sensitivity is factored in with supply voltage, the self test response in volts is roughly proportional to the cube of the supply voltage. For example, at VS = 3.6 V, the self test response for the ADXL337 is approximately −560 mV for the X-axis, +560 mV for the Y-axis, and +950 mV for the Z-axis. AY TOP AX Figure 23. Axes of Acceleration Sensitivity, Corresponding Output Voltage Increases When Accelerated Along the Sensitive Axis XOUT = –1g YOUT = 0g ZOUT = 0g TOP GRAVITY TOP TOP XOUT = 0g YOUT = –1g ZOUT = 0g TOP XOUT = 1g YOUT = 0g ZOUT = 0g TOP XOUT = 0g YOUT = 0g ZOUT = 1g Figure 24. Output Response vs. Orientation to Gravity Rev. 0 | Page 12 of 16 XOUT = 0g YOUT = 0g ZOUT = –1g 09358-031 XOUT = 0g YOUT = 1g ZOUT = 0g 09358-030 USE WITH OPERATING VOLTAGES OTHER THAN 3 V ADXL337 LAYOUT AND DESIGN RECOMMENDATIONS The recommended soldering profile is shown in Figure 25 followed by a description of the profile features in Table 6. The recommended PCB layout or solder land drawing is shown in Figure 26. CRITICAL ZONE TL TO TP tP TP tL TSMAX TSMIN tS RAMP-DOWN PREHEAT 09358-002 TEMPERATURE RAMP-UP TL t25°C TIME Figure 25. Recommended Soldering Profile Table 6. Recommended Soldering Profile Profile Feature Average Ramp Rate (TL to TP) Preheat Minimum Temperature (TSMIN) Maximum Temperature (TSMAX) Time (TSMIN to TSMAX), tS TSMAX to TL Ramp-Up Rate Time Maintained Above Liquidous (TL) Liquidous Temperature (TL) Time (tL) Peak Temperature (TP) Time within 5°C of Actual Peak Temperature (tP) Ramp-Down Rate Time 25°C to Peak Temperature (t25°C) 0.40 MAX Sn63/Pb37 3°C/sec maximum Pb-Free 3°C/sec maximum 100°C 150°C 60 sec to 120 sec 150°C 200°C 60 sec to 180 sec 3°C/sec maximum 3°C/sec maximum 183°C 60 sec to 150 sec 240°C + 0°C/−5°C 10 sec to 30 sec 6°C/sec maximum 6 minutes maximum 217°C 60 sec to 150 sec 260°C + 0°C/−5°C 20 sec to 40 sec 6°C/sec maximum 8 minutes maximum 3 0.50 0.25 0.25 MAX 0.50 3 1.60 0.25 CENTER PAD IS NOT INTERNALLY CONNECTED BUT SHOULD BE SOLDERED FOR MECHANICAL INTEGRITY DIMENSIONS SHOWN IN MILLIMETERS Figure 26. Recommended PCB Layout Rev. 0 | Page 13 of 16 09358-004 1.60 ADXL337 OUTLINE DIMENSIONS PIN 1 INDICATOR 0.30 0.25 0.18 0.50 BSC 13 PIN 1 INDICATOR 16 1 12 1.70 1.60 SQ 1.50 EXPOSED PAD 9 TOP VIEW 1.50 1.45 1.40 0.45 0.40 0.35 4 8 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.152 REF SEATING PLANE 5 0.20 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 04-27-2010-A 3.10 3.00 SQ 2.90 Figure 27. 16-Lead Lead Frame Chip Scale Package [LFCSP_LQ] 3 mm × 3 mm Body, Thick Quad (CP-16-28) Dimensions shown in millimeters ORDERING GUIDE Model 1 ADXL337BCPZ–RL ADXL337BCPZ–RL7 EVAL-ADXL337Z 1 Measurement Range ±3 g ±3 g Specified Voltage 3V 3V Temperature Range −40°C to +85°C −40°C to +85°C Z = RoHS Compliant Part. Rev. 0 | Page 14 of 16 Package Description 16-Lead LFCSP_LQ 16-Lead LFCSP_LQ Evaluation Board Package Option CP-16-28 CP-16-28 ADXL337 NOTES Rev. 0 | Page 15 of 16 ADXL337 NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09358-0-10/10(0) Rev. 0 | Page 16 of 16