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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. 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 ?2004C2011 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 m g resolution at 60 hz low power: 700 a at v s = 5 v (typical) high zero g bias stability high sensitivity accuracy ?40c to +125c 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 vehicle dynamic controls 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 g /hz, allowing signals below 1 m g (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 c x and capacitor c y at the x out and y out 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 x out v s c dc c x r filt 32k ? demod ac amp adxl203 sensor +5v output amp output amp com st y out v s c dc c y r filt 32k ? demod x out c x r filt 32k ? ac amp 03757-001 figure 1.
adxl103/adxl203 data sheet rev. d | page 2 of 16 table of contents features .............................................................................................. 1 ? applications....................................................................................... 1 ? general description ......................................................................... 1 ? functional block diagrams............................................................. 1 ? specifications..................................................................................... 3 ? absolute maximum ratings............................................................ 4 ? esd caution.................................................................................. 4 ? pin configurations and function descriptions ........................... 5 ? typical performance characteristics ............................................. 6 ? adxl103 and adxl203............................................................. 6 ? ad22293........................................................................................ 9 ? ad22035 and ad22037 ............................................................ 10 ? all models ................................................................................... 12 ? theory of operation ...................................................................... 13 ? performance ................................................................................ 13 ? applications information .............................................................. 14 ? power supply decoupling ......................................................... 14 ? setting the bandwidth using c x and c y ................................. 14 ? self test ........................................................................................ 14 ? design trade-offs for selecting filter characteristics: the noise/bandwidth trade-off ..................................................... 14 ? using the adxl103/adxl203 with operating voltages other than 5 v............................................................................ 15 ? using the adxl203 as a dual-axis tilt sensor .... .................... 15 ? outline dimensions ....................................................................... 16 ? ordering guide .......................................................................... 16 ? automotive products ................................................................. 16 ? revision history 9/11rev. c to rev. d added ad22293, ad22035, and ad22037 ............... throughout changes to application section and general description section................................................................................................ 1 changes to table 1............................................................................ 3 deleted figure 13 and figure 14: renumbered sequentially ..... 7 deleted figure 17 and figure 22..................................................... 8 added figure 19 to figure 24; renumbered sequentially .......... 9 added figure 25 to figure 34........................................................ 10 added all models section, figure 35 to figure 38 .................... 12 changes to figure 39...................................................................... 13 changes to ordering guide .......................................................... 16 changes to automotive products section................................... 16 5/10rev. b to rev. c changes to figure 24 caption....................................................... 12 added automotive products section .......................................... 12 4/10rev. a to rev. b changes to features section ............................................................1 updated outline dimensions....................................................... 12 changes to ordering guide .......................................................... 12 2/06rev. 0 to rev. a changes to features ..........................................................................1 changes to table 1.............................................................................3 changes to figure 2...........................................................................4 changes to figure 3 and figure 4....................................................5 changes to the performance section..............................................9 4/04revision 0: initial version
data sheet adxl103/adxl203 rev. d | page 3 of 16 specifications t a = ?40c to +125c, v s = 5 v, c x = c y = 0.1 f, 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 test conditions min typ max min typ max min typ max unit sensor each axis measurement range 1 1.7 5 6 18 g nonlinearity % of full scale 0.2 1.25 0.2 1.25 0.2 1.25 % 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 x out , y out v s = 5 v 960 1000 1040 293 312 331 94 100 106 mv/ g sensitivity change due to temperature 3 v s = 5 v 0.3 0.3 0.3 % zero g bias level (ratiometric) each axis 0 g voltage at x out , y out v s = 5 v 2.4 2.5 2.6 2.4 2.5 2.6 2.4 2.5 2.6 v initial 0 g output deviation from ideal v s = 5 v, 25c 25 50 125 m g 0 g offset vs. temperature 0.1 0.8 0.3 1.8 1 m g /c noise output noise <4 khz, v s = 5 v 1 3 1 3 2 mv rms noise density 110 200 130 g /hz rms frequency response 4 c x , c y range 5 0.002 10 0.002 10 0.002 10 f r filt tolerance 24 32 40 24 32 40 24 32 40 k sensor resonant frequency 5.5 5.5 5.5 khz self test 6 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 k output change at x out , y out st 0 to st 1 450 750 1100 125 250 375 60 80 100 mv output amplifier output swing low no load 0.05 0.2 0.05 0.2 0.05 0.2 v output swing high no load 4.5 4.8 4.5 4.8 4.5 4.8 v power supply (v dd ) operating voltage range 3 6 3 6 3 6 v quiescent supply current 0.7 1.1 0.7 1.1 0.7 1.1 ma turn-on time 7 20 20 20 ms 1 guaranteed by measurement of initial offset and sensitivity. 2 sensitivity is essentially ratiometric to v s . for v s = 4.75 v to 5.25 v, se nsitivity 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 (c x , c y ). 5 bandwidth = 1/(2 32 k c). for c x , c y = 0.002 f, bandwidth = 2500 hz. for c x , c y = 10 f, bandwidth = 0.5 hz. minimum/maximum values are not tested. 6 self-test response changes cubically with v s . 7 larger values of c x , c y increase turn-on time. turn-o n time is approximately 160 c x or c y + 4 ms, where c x , c y are in f.
adxl103/adxl203 data sheet rev. d | page 4 of 16 absolute maximum ratings table 2. parameter rating acceleration (any axis, unpowered) 3500 g acceleration (any axis, powered) 3500 g drop test (concrete surface) 1.2 m v s ?0.3 v to +7.0 v all other pins (com ? 0.3 v) to (v s + 0.3 v) output short-circuit duration (any pin to common) indefinite temperature range (powered) ?55c to +125c temperature range (storage) ?65c 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 may affect device reliability. table 3. package characteristics package type ja jc device weight 8-terminal ceramic lcc 120c/w 20c/w <1.0 gram esd caution t p t l t 25c to peak t s preheat critical zone t l to t p temperature time ramp-down ramp-up t smin t smax t p t l 03757-102 figure 2. recommended soldering profile table 4. solder profile parameters test condition profile feature sn63/pb37 pb-free average ramp rate (t l to t p ) 3c/second maximum 3c/second maximum preheat minimum temperature (t smin ) 100c 150c maximum temperature (t smax ) 150c 200c time (t smin to t smax ) (t s ) 60 seconds to 120 seconds 60 seconds to 150 seconds t smax to t l ramp-up rate 3c/second 3c/second time maintained above liquidous (t l ) liquidous temperature (t l ) 183c 217c time (t l ) 60 seconds to 150 seconds 60 seconds to 150 seconds peak temperature (t p ) 240c + 0c/?5c 260c + 0c/?5c time within 5c of actual peak temperature (t p ) 10 seconds to 30 seconds 20 seconds to 40 seconds ramp-down rate 6c/second maximum 6c/second maximum time 25c to peak temperature 6 minutes maximum 8 minutes maximum
data sheet adxl103/adxl203 rev. d | page 5 of 16 pin configurations and function descriptions adxl103 top view (not to scale) st 1 nc 2 com 3 nc 4 x out nc nc notes 1. nc = no connect. do not connect to this pin . 7 6 5 v s +x 8 03757-002 figure 3. adxl103 pin configuration adxl203 top view (not to scale) st 1 nc 2 com 3 nc 4 x out y out nc 7 6 5 v s 8 +x +y 03757-003 notes 1. nc = no connect. do not connect to this pin . figure 4. adxl203 pin configuration table 5. adxl103 pin function descriptions pin no. mnemonic description 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 pin no. mnemonic description 1 st self test 2 nc do not connect 3 com common 4 nc do not connect 5 nc do not connect 6 y out y channel output 7 x out x channel output 8 v s 3 v to 6 v
adxl103/adxl203 data sheet rev. d | page 6 of 16 typical performance characteristics adxl103 and adxl203 v s = 5 v for all graphs, unless otherwise noted. percent of population (%) 0 25 20 15 10 5 zero g bias (v) ?0.10 ?0.08 ?0.06 ?0.04 ?0.02 0 0.02 0.04 0.06 0.08 0.10 03757-010 figure 5. x-axis zero g bias deviation from ideal at 25c percent of population (%) 0 25 30 20 15 10 5 temperature coefficient (m g /c) ?0.80 ?0.70 ?0.60 ?0.50 ?0.40 ?0.30 ?0.20 ?0.10 0 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 03757-011 figure 6. x-axis zero g bias temperature coefficient percent of population (%) 0 35 40 20 25 30 15 10 5 sensitivity (v/ g) 0.94 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 03757-012 figure 7. x-axis sensitivity at 25c percent of population (%) 0 30 25 20 15 10 5 ?0.10 ?0.08 ?0.06 ?0.04 ?0.02 0 0.02 0.04 0.06 0.08 0.10 03757-013 zero g bias (v) figure 8. y-axis zero g bias deviation from ideal at 25c percent of popul a tion (%) 0 25 20 15 10 5 ?0.80 ?0.70 ?0.60 ?0.50 ?0.40 ?0.30 ?0.20 ?0.10 0 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 03757-014 temperature coefficient (m g /c) figure 9. y-axis zero g bias temperature coefficient percent of population (%) 0 35 40 20 25 30 15 10 5 sensitivity (v/ g) 0.94 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 03757-015 figure 10. y-axis sensitivity at 25c
data sheet adxl103/adxl203 rev. d | page 7 of 16 temperature (c) voltage (1v/ g ) ?50 2.40 2.60 2.58 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.42 ?40 ?30 ?20 ?10 0 10 20 30 50 40 60 70 80 90 100 110 120 130 03757-004 figure 11. zero g bias vs. temperature; parts soldered to pcb x axis noise density (m g / hz) percent of population (%) 0 40 35 30 25 20 15 10 5 45 50 150 140130 120 11010090 80 70 60 03757-007 figure 12. x-axis noise density at 25c temperature (c) sensitivity (v/ g ) ?50 0.97 1.00 0.99 0.98 1.02 1.01 1.03 ?40 ?30 ?20 ?10 0 10 20 30 50 40 60 70 80 90 100 110 120 130 03757-016 figure 13. sensitivity vs. temperature; parts soldered to pcb y axis noise density (m g / hz) percent of population (%) 0 40 35 30 25 20 15 10 5 45 50 150 140130 120 11010090 80 70 60 03757-008 figure 14. y-axis noise density at 25c
adxl103/adxl203 data sheet rev. d | page 8 of 16 percent of population (%) 0 45 20 25 30 35 40 15 10 5 self-test output (v) 0.40 0.45 0.50 0.55 0.65 0.60 0.70 0.75 0.80 0.85 0.90 0.95 1.00 03757-017 figure 15. x-axis self-test response at 25c temperature (c) voltage (1v/ g ) ?50 0.50 0.80 0.75 0.70 0.65 0.60 0.55 0.85 0.90 ?40 ?30 ?20 ?10 0 10 20 30 50 40 60 70 80 90 100 110 120 130 03757-103 figure 16. self-test response vs. temperature percent of population (%) 0 45 20 25 30 35 40 15 10 5 self-test output (v) 0.40 0.45 0.50 0.55 0.65 0.60 0.70 0.75 0.80 0.85 0.90 0.95 1.00 03757-019 figure 17. y-axis self-test response at 25c percent of population (%) 0 80 70 60 50 40 30 20 10 90 100 current (a) 3v 5v 200 300 400 500 600 700 800 900 1000 03757-018 figure 18. supply current at 25c
data sheet adxl103/adxl203 rev. d | page 9 of 16 ad22293 0 10 20 30 40 50 60 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 zero g bias (v) percent of popul a tion (%) 03757-117 figure 19. x-axis zero g bias at 25c percent of popul a tion (%) 0 5 10 15 20 25 ?1.2 ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 temperature coefficient (m g /c) 03757-118 figure 20. x-axis zero g bias temperature coefficient percent of popul a tion (%) 0 10 20 30 40 50 60 70 80 90 0.287 0.297 0.307 0.317 0.327 0.337 0.347 0.357 0.367 0.377 0.387 sensitivity (v/ g ) 03757-021 figure 21. x-axis sensitivity at 25c percent of popul a tion (%) 0 10 20 30 40 50 60 70 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 zero g bias (v) 03757-119 figure 22. y-axis zero g bias at 25c percent of popul a tion (%) ?1.2 ?1.0 ?0.8 ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 temperature coefficient (m g /c) 0 5 10 15 20 25 03757-020 figure 23. y-axis zero g bias temperature coefficient percent of popul a tion (%) 0 10 20 30 40 50 60 70 80 0.287 0.297 0.307 0.317 0.327 0.337 0.347 0.357 0.367 0.377 0.387 sensitivity (v/ g ) 03757-022 figure 24. y-axis sensitivity at 25c
adxl103/adxl203 data sheet rev. d | page 10 of 16 ad22035 and ad22037 0 10 20 30 40 50 60 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 percent of popul a tion zero g bias (mv) 03757-105 figure 25. x-axis zero g bias deviation from ideal at 25c 0 5 10 15 20 25 30 35 ?3.0 ?2.5 ?2.0 ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 percent of popul a tion temperature coefficient (m g /c) 03757-106 figure 26. x-axis zero g bias temperature coefficient 0 5 10 15 20 25 97 98 99 100 101 102 103 percent of popul a tion sensitivity (mv/ g) 03757-107 figure 27. x-axis sensitivity at 25c 0 10 20 30 40 50 60 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 50 percent of popul a tion 03757-108 zero g bias (mv) figure 28. y-axis zero g bias deviation from ideal at 25c 0 5 10 15 20 25 30 35 ?3.0 ?2.5 ?2.0 ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 percent of popul a tion temperature coefficient (m g /c) 03757-009 figure 29. y-axis zero g bias temperature coefficient 0 5 10 15 20 25 97 98 99 100 101 102 103 percent of popul a tion sensitivity (mv/ g) 03757-110 figure 30. y-axis sensitivity at 25c
data sheet adxl103/adxl203 rev. d | page 11 of 16 0 5 10 15 20 25 30 35 40 0.060 0.065 0.070 0.075 0.080 0.085 0.090 0.095 0.100 percent of popul a tion self-test output (v) 03757-111 figure 31. x-axis self test response at 25c 97.5 98.0 98.5 99.0 99.5 100.0 100.5 101.0 ?50 ?25 0 25 50 75 100 125 sensitivity (mv) temperature (c) 03757-112 figure 32. sensitivity vs. temperature; parts soldered to pcb 0 5 10 15 20 25 30 35 40 45 0.060 0.065 0.070 0.075 0.080 0.085 0.090 0.095 0.100 percent of popul a tion self-test output (v) 03757-114 figure 33. y-axis self test response at 25c 0 10 20 30 40 50 60 70 80 90 680 700 720 740 760 780 800 820 840 860 880 900 920 940 960 percent of popul a tion current (a) 25c 105c 03757-113 figure 34. supply current vs. temperature
adxl103/adxl203 data sheet rev. d | page 12 of 16 all models percent sensitivity (%) percent of population ( % ) ?5.0 0 30 25 20 15 10 5 35 40 ?4.0 ?3.0 ?2.0 ?1.0 0 1.0 2.0 3.0 4.0 5.0 09781-023 figure 35. z vs. x cross-axis sensitivity temperature (c) current ( m a) 0.3 0.8 0.7 0.6 0.5 0.4 0.9 150 100 50 0 ?50 v s =5v v s =3v 09781-024 figure 36. supply current vs. temperature percent sensitivity (%) percent of population ( % ) ?5.0 0 30 25 20 15 10 5 35 40 ?4.0 ?3.0 ?2.0 ?1.0 0 1.0 2.0 3.0 4.0 5.0 09781-026 figure 37. z vs. y cross-axis sensitivity 09781-027 time voltage (v) figure 38. turn-on time; c x , c y = 0.1 f, time scale = 2 ms/div
data sheet adxl103/adxl203 rev. d | page 13 of 16 theory of operation the adxl103 / adxl203 are complete acceleration measurement systems on a single, monolithic ic. the adxl103 is a single- axis accelerometer, and the adxl203 is a dual-axis accelerometer. both parts contain a polysilicon surface-micro-machined 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 adxl103 / adxl203 are capable of measuring both positive and negative accelerations from 1.7 g to at least 18 g . the accelerometer can measure static acceleration forces, such as gravity, allowing it to be used as a tilt sensor. the sensor is a surface-micromachined polysilicon structure built on top of the 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. the output of the demodulator is amplified and brought off-chip through a 32 k resistor. at this point, the user can set 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 that high performance is built in. as a result, there is essentially no quantization error or nonmonotonic behavior, and temperature hysteresis is very low (typically less than 10 m g over the ?40c to +125c temperature range). figure 11 shows the 0 g output performance of eight parts (x and y axes) over a ?40c to +125c temperature range. figure 13 demonstrates the typical sensitivity shift over temperature for v s = 5 v. sensitivity stability is optimized for v s = 5 v but is still very good over the specified range; it is typically better than 1% over temperature at v s = 3 v. earth?s surface top view (not to scale) x out = 0 g y out = 0 g pin 8 x out = ?1 g y out = 0 g pin 8 x out = +1 g y out = 0 g pin 8 x out = 0 g y out = +1 g pin 8 x out = 0 g y out = ?1 g 03757-028 figure 39. output resp onse vs. orientation
adxl103/adxl203 data sheet rev. d | page 14 of 16 applications information power supply decoupling for most applications, a single 0.1 f capacitor, c dc , adequately decouples the accelerometer from noise on the power supply. however, in some cases, particularly where noise is present at the 140 khz internal clock frequency (or any harmonic thereof), noise on the supply can cause interference on the adxl103 / adxl203 output. if additional decoupling is needed, a 100 (or smaller) resistor or ferrite beads can be inserted in the supply line of the adxl103 / adxl203 . additionally, a larger bulk bypass capacitor (in the 1 f to 22 f range) can be added in parallel to c dc . setting the bandwidth using c x and c y the adxl103 / adxl203 has provisions for band limiting the x out and y out 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 C3 db = 1/(2(32 k) c ( x , y ) ) or more simply, f C3 db = 5 f/ c ( x , y ) the tolerance of the internal resistor (r filt ) can vary typically as much as 25% of its nominal value (32 k); thus, the bandwidth varies accordingly. a minimum capacitance of 2000 pf for c x and c y is required in all cases. table 7. filter capacitor selection, c x and c y bandwidth (hz) capacitor (f) 1 4.7 10 0.47 50 0.10 100 0.05 200 0.027 500 0.01 self test the st pin controls the self test feature. when this pin is set to v s , an electrostatic force is exerted on the beam of the accelerometer. the resulting movement of the beam allows the user to test if the accelerometer is functional. the typical change in output is 750 m g (corresponding to 750 mv). this pin can be left open- circuit or connected to common in normal use. never expose the st pin to voltages greater than v s + 0.3 v. if the system design is such that this condition cannot be guaranteed (that is, multiple supply voltages are present), a low v f clamping diode between st and v s is recommended. design trade-offs for selecting filter characteristics: the noise/bandwidth trade-off the accelerometer bandwidth selected ultimately determines the measurement resolution (smallest detectable acceleration). filtering can be used to lower the noise floor, improving the resolution of the accelerometer. resolution is dependent on the analog filter bandwidth at x out and y out . the output of the adxl103 / adxl203 has a typical bandwidth of 2.5 khz. 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 further decreased to reduce noise and improve resolution. the adxl103 / adxl203 noise has the characteristics of white gaussian noise, which contributes equally at all frequencies and is described in terms of g /hz (that is, the noise is proportional to the square root of the accelerometer bandwidth). 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 adxl103 / adxl203 is determined by rmsnoise = (110 g /hz) ( 6.1bw ) at 100 hz, the noise is rmsnoise = (110 g /hz) ( 6.1100 ) = 1.4 m g often, the peak value of the noise is desired. peak-to-peak noise can only be estimated by statistical methods. table 8 is useful for estimating the probabilities of exceeding various peak values, given the rms value. table 8. estimation of peak-to-peak noise peak-to-peak value % of time that noise exceeds nominal peak-to-peak value 2 rms 32 4 rms 4.6 6 rms 0.27 8 rms 0.006 peak-to-peak noise values give the best estimate of the uncertainty in a single measurement; peak-to-peak noise is estimated by 6 rms. table 9 gives the typical noise output of the adxl103 / adxl203 for various c x and c y values. table 9. filter capacitor selection (c x , c y ) bandwidth (hz) c x , c y (f) rms noise (m g ) peak-to-peak noise estimate (m g ) 10 0.47 0.4 2.6 50 0.1 1.0 6 100 0.047 1.4 8.4 500 0.01 3.1 18.7
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 v s = 5 v; however, it can be powered with v s 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 v s = 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 v s /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 v s = 3 v, the noise density is typically 190 g /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 m g (typical). the supply current decreases as the supply voltage decreases. typical current consumption at v dd = 3 v is 450 a. 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 earths 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 C1 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 m g per degree of tilt. at 45, its output changes at only 12.2 m g 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 earths 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 C1 g and +1 g , the output tilt in degrees is calculated as pitch = asin ( a x /1 g ) roll = asin ( a y /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.
adxl103/adxl203 data sheet rev. d | page 16 of 16 outline dimensions bottom view (plating option 1, see detail a foroption2) detail a (option 2) 1 3 5 7 top view 0.075 ref r 0.008 (4 plcs) 0.203 0.197 sq 0.193 0.020 0.015 0.010 (r 4 plcs ) 0.180 0.177 sq 0.174 0.087 0.078 0.069 0.008 0.006 0.004 0.077 0.070 0.063 0.054 0.050 0.046 0.030 0.025 0.020 0.028 0.020 dia 0.012 0.019 sq 0.106 0.100 0.094 r 0.008 (8 plcs) 05-21-2010-d figure 40. 8-terminal cerami c leadless chip carrier [lcc] (e-8-1) dimensions shown in inches ordering guide model 1 , 2 axes device generic g -range specified voltage (v) temperature range package description package option ADXL103CE 1 adxl103 1.7 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ADXL103CECreel 1 adxl103 1.7 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adxl103wcezb-reel 1 adxl103 1.7 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22035z 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22035z-rl 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22035z-rl7 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22035z 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22035z-rl 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22035z-rl7 1 adxl103 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adxl203ce 2 adxl203 1.7 5 C40c to +125c 8-terminal ceramic lcc e-8-1 adxl203ce-reel 2 adxl203 1.7 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adxl203wcezb-reel 2 adxl203 1.7 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adxl203eb evaluation board ad22293za 2 adxl203 5 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22293za 2 adxl203 5 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22037z 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22037z-rl 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 ad22037z-rl7 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22037z 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22037z-rl 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 adw22037z-rl7 2 adxl203 18 5 ?40c to +125c 8-terminal ceramic lcc e-8-1 1 z = rohs compliant part. 2 w = qualified for auto motive applications. automotive products the adxl103w, adw22035, adxl203w, adw22293, and adw22037 models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review the specifications section of this data sheet carefully. only the automotive grade products shown are available for use in automotive applications. contact your local analog devices account representative for s pecific product ordering information and to obtain the specific automotive reliability reports for these models. ?2004C2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d03757-0-9/11(d)

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