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Precision ±1.7 g, ±5 g, ±18 g Single-/ Dual-Axis iMEMS® Accelerometer Data Sheet ADXL103/ADXL203 Rev. D 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. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2004–2011 Analog Devices, Inc. All rights reserved.
FEATURES
High performance, single-/dual-axis accelerometer on a single IC chip 5 mm × 5 mm × 2 mm LCC package 1 mg resolution at 60 Hz Low power: 700 μA at VS = 5 V (typical) High zero g bias stability High sensitivity accuracy −40°C to +125°C temperature range X and Y axes aligned to within 0.1° (typical) Bandwidth adjustment with a single capacitor Single-supply operation 3500 g shock survival RoHS compliant Compatible with Sn/Pb- and Pb-free solder processes Qualified for automotive applications
APPLICATIONS
Electronic chassis controls Platform stabilization/leveling Navigation Alarms and motion detectors High accuracy, 2-axis tilt sensing Vibration monitoring and compensation Abuse event detection GENERAL DESCRIPTION The ADXL103/ADXL203 are high precision, low power, complete single- and dual-axis accelerometers with signal conditioned voltage outputs, all on a single, monolithic IC. The ADXL103/ ADXL203 measure acceleration with a full-scale range of ±1.7 g, ±5 g, or ±18 g. The ADXL103/ADXL203 can measure both dynamic acceleration (for example, vibration) and static acceleration (for example, gravity). The typical noise floor is 110 μg/√Hz, allowing signals below 1 mg (0.06° of inclination) to be resolved in tilt sensing applications using narrow bandwidths (<60 Hz). The user selects the bandwidth of the accelerometer using Capacitor CX and Capacitor CY at the XOUT and YOUT pins. Bandwidths of 0.5 Hz to 2.5 kHz can be selected to suit the application. The ADXL103 and ADXL203 are available in a 5 mm × 5 mm × 2 mm, 8-terminal ceramic LCC package. FUNCTIONAL BLOCK DIAGRAMS ADXL103 SENSOR +5V OUTPUT AMP COM ST XOUT VS CDC CX RFILT 32kΩ DEMODAC AMP ADXL203 SENSOR +5V OUTPUT AMP OUTPUT AMP COM ST YOUT VS CDC CY RFILT 32kΩ DEMOD XOUT CX RFILT 32kΩ AC AMP 03757-001 Figure 1.
ADXL103/ADXL203 Data Sheet Rev. D | Page 2 of 16 TABLE OF CONTENTS Design Trade-Offs for Selecting Filter Characteristics: The Using the ADXL103/ADXL203 with Operating Voltages
REVISION HISTORY
9/11—Rev. C to Rev. D Changes to Application Section and General Description 5/10—Rev. B to Rev. C 4/10—Rev. A to Rev. B 2/06—Rev. 0 to Rev. A 4/04—Revision 0: Initial Version
Data Sheet ADXL103/ADXL203 Rev. D | Page 3 of 16 SPECIFICATIONS TA = −40°C to +125°C, VS = 5 V , CX = CY = 0.1 μF, acceleration = 0 g, unless otherwise noted. All minimum and maximum specifications are guaranteed. All typical specifications are not guaranteed. Table 1. ADXL103/ADXL203 AD22293 AD22035/AD22037 Parameter T est Conditions Min Typ Max Min Typ Max Min Typ Max Unit SENSOR Each axis Measurement Range1 ±1.7 ±5 ±6 ±18 g Package Alignment Error ±1 ±1 ±1 Degrees Alignment Error (ADXL203) X to Y sensor ±0.1 ±0.1 ±0.1 Degrees Cross-Axis Sensitivity ±1.5 ±3 ±1.5 ±3 ±1.5 ±3 % SENSITIVITY (RATIOMETRIC)2 Each axis Sensitivity at XOUT, YOUT V S = 5 V 960 1000 1040 293 312 331 94 100 106 mV/g Sensitivity Change Due to Temperature3 ZERO g BIAS LEVEL (RATIOMETRIC) Each axis Initial 0 g Output Deviation From Ideal VS = 5 V, 25°C ±25 ±50 ±125 mg NOISE Output Noise <4 kHz, VS = 5 V 1 3 1 3 2 mV rms Noise Density 110 200 130 μg/√Hz rms FREQUENCY RESPONSE4 CX, CY Range5 0.002 10 0.002 10 0.002 10 μF RFILT Tolerance 24 32 40 24 32 40 24 32 40 kΩ Sensor Resonant Frequency 5.5 5.5 5.5 kHz SELF TEST6 Logic Input Low 1 1 1 V Logic Input High 4 4 4 V ST Input Resistance to GND 30 50 30 50 30 50 kΩ Output Change at XOUT, YOUT ST 0 to ST 1 450 750 1100 125 250 375 60 80 100 mV OUTPUT AMPLIFIER POWER SUPPLY (VDD) Operating Voltage Range 3 6 3 6 3 6 V Turn-On Time7 20 20 20 ms 1 Guaranteed by measurement of initial offset and sensitivity. 2 Sensitivity is essentially ratiometric to VS. For VS = 4.75 V to 5.25 V, sensitivity is 186 mV/V/g to 215 mV/V/g. 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 capacitor (CX, CY). 6 Self-test response changes cubically with VS. 7 Larger values of CX, CY increase turn-on time. Turn-on time is approximately 160 × CX or CY + 4 ms, where CX, CY are in μF.
rating conditions for extended periods may affect device reliability. Table 3. Package Characteristics Figure 2. Recommended Soldering Profile Table 4. Solder Profile Parameters
- NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 3. ADXL103 Pin Configuration
- NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 4. ADXL203 Pin Configuration Table 5. ADXL103 Pin Function Descriptions
1 ST Self Test
2 NC Do Not Connect
3 COM Common
4 NC Do Not Connect
5 NC Do Not Connect
6 NC Do Not Connect
7 X OUT X Channel Output
8 V S 3 V to 6 V
Table 6. ADXL203 Pin Function Descriptions
6 Y OUT Y Channel Output
decouples the accelerometer from noise on the power supply. implement low-pass filtering for antialiasing and noise reduction. CY is required in all cases. Table 7. Filter Capacitor Selection, CX and CY an electrostatic force is exerted on the beam of the accelerometer. circuit or connected to common in normal use. diode between ST and VS is recommended. the measurement resolution (smallest detectable acceleration). reduce noise and improve resolution. resolution and dynamic range of the accelerometer. Table 8. Estimation of Peak-to-Peak Noise ADXL203 for various CX and CY values. Table 9. Filter Capacitor Selection (CX, CY)
Data Sheet ADXL103/ADXL203 Rev. D | Page 15 of 16 USING THE ADXL103/ADXL203 WITH OPERATING VOLTAGES OTHER THAN 5 V The ADXL103/ADXL203 is tested and specified at VS = 5 V; however, it can be powered with VS as low as 3 V or as high as 6 V . Some performance parameters change as the supply voltage is varied. The ADXL103/ADXL203 output is ratiometric, so the output sensitivity (or scale factor) varies proportionally to the supply voltage. At VS = 3 V , the output sensitivity is typically 560 mV/g. The zero g bias output is also ratiometric, so the zero g output is nominally equal to VS/2 at all supply voltages. 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 V , the noise density is typically 190 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, self test response in volts is roughly proportional to the cube of the supply voltage. So at V S = 3 V , the self test response is approximately equivalent to 150 mV or equivalent to 270 mg (typical). The supply current decreases as the supply voltage decreases. Typical current consumption at VDD = 3 V is 450 μA. USING THE ADXL203 AS A DUAL-AXIS TILT SENSOR One of the most popular applications of the ADXL203 is tilt measurement. An accelerometer uses the force of gravity as an input vector to determine the orientation of an object in space. An accelerometer is most sensitive to tilt when its sensitive axis is perpendicular to the force of gravity, that is, parallel to the earth’s surface. At this orientation, its sensitivity to changes in tilt is highest. When the accelerometer is oriented on axis to gravity, that is, near its +1 g or –1 g reading, the change in output acceleration per degree of tilt is negligible. When the accelerometer is perpendicular to gravity, its output changes nearly 17.5 mg per degree of tilt. At 45°, its output changes at only 12.2 mg per degree, and resolution declines. Dual-Axis Tilt Sensor: Converting Acceleration to Tilt When the accelerometer is oriented so both its x-axis and y-axis are parallel to the earth’s surface, it can be used as a 2-axis tilt sensor with a roll axis and a pitch axis. Once the output signal from the accelerometer has been converted to an acceleration that varies between –1 g and +1 g, the output tilt in degrees is calculated as PITCH = ASIN(A X/1 g) ROLL = ASIN(AY/1 g) Be sure to account for overranges. It is possible for the accelerometers to output a signal greater than ±1 g due to vibration, shock, or other accelerations.
0.075 REF
0.020 DIA
Figure 40. 8-Terminal Ceramic Leadless Chip Carrier [LCC] 2 W = Qualified for Automotive Applications. product ordering information and to obtain the specific Automotive Reliability reports for these models. registered trademarks are the property of their respective owners.