AD22035Z-RL [ADI]
Precision 1.7g, -1.7g, 5g, -5g, 18g, -18g Single-/ Dual-Axis iMEMS Accelerometer; 精密1.7克， -1.7g ，5G ， -5g ，18G ， -18g单/双轴加速度计的iMEMS
| 型号： | AD22035Z-RL |
| 厂家： | 
ADI |
| 描述： | Precision 1.7g, -1.7g, 5g, -5g, 18g, -18g Single-/ Dual-Axis iMEMS Accelerometer |
| 文件： | 总16页 (文件大小：618K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Precision ± ±1. g, ± ꢀ g, ± ±ꢁ g Single-/
Dual-Axis iMEMS® Accelerometer
Data Sheet
ADXL±03/ADXL203
FEATURES
GENERAL DESCRIPTION
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
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,
±± g, or ±1ꢀ g. The ADXL103/ADXL203 can measure both
dynamic acceleration (for example, vibration) and static
acceleration (for example, gravity).
−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
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.± Hz to 2.± kHz can be selected to suit the
application.
Compatible with Sn/Pb- and Pb-free solder processes
Qualified for automotive applications
The ADXL103 and ADXL203 are available in a ± mm × ± mm ×
2 mm, ꢀ-terminal ceramic LCC package.
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
FUNCTIONAL BLOCK DIAGRAMS
+5V
+5V
V
S
V
S
ADXL203
ADXL103
C
C
AC
AMP
OUTPUT
AMP
OUTPUT
AMP
AC
AMP
OUTPUT
AMP
DC
DC
DEMOD
DEMOD
SENSOR
COM
SENSOR
COM
R
32kΩ
R
32kΩ
R
FILT
32kΩ
FILT
FILT
ST
X
OUT
ST
Y
X
OUT
OUT
C
C
C
X
X
Y
Figure 1.
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 registeredtrademarks arethe 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 ©2004–2011 Analog Devices, Inc. All rights reserved.
ADXL±03/ADXL203
Data Sheet
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 ........................... ±
Typical Performance Characteristics ............................................. 6
ADXL103 and ADXL203............................................................. 6
AD22293........................................................................................ 9
AD2203± and AD22037 ............................................................ 10
All Models ................................................................................... 12
Theory of Operation ...................................................................... 13
Performance................................................................................ 13
Applications Information.............................................................. 14
Power Supply Decoupling ......................................................... 14
Setting the Bandwidth Using CX and CY ................................. 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 ± V............................................................................ 1±
Using the ADXL203 as a Dual-Axis Tilt Sensor ........................ 1±
Outline Dimensions....................................................................... 16
Ordering Guide .......................................................................... 16
Automotive Products................................................................. 16
REVISION HISTORY
9/11—Rev. C to Rev. D
4/10—Rev. A to Rev. B
Added AD22293, AD2203±, 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..................................................... ꢀ
Added Figure 19 to Figure 24; Renumbered Sequentially .......... 9
Added Figure 2± to Figure 34........................................................ 10
Added All Models Section, Figure 3± to Figure 3ꢀ .................... 12
Changes to Figure 39...................................................................... 13
Changes to Ordering Guide .......................................................... 16
Changes to Automotive Products Section................................... 16
Changes to Features Section ............................................................1
Updated Outline Dimensions....................................................... 12
Changes to Ordering Guide.......................................................... 12
2/06—Rev. 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....................................................±
Changes to the Performance Section..............................................9
4/04—Revision 0: Initial Version
5/10—Rev. B to Rev. C
Changes to Figure 24 Caption....................................................... 12
Added Automotive Products Section .......................................... 12
Rev. D | Page 2 of 16
Data Sheet
ADXL±03/ADXL203
SPECIFICATIONS
TA = −40°C to +12±°C, VS = ± 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
Typ Max
AD22035/AD22037
Parameter
Test Conditions Min
Each axis
Typ
Max
Min
Min
Typ
Max
Unit
SENSOR
Measurement Range1
±1.ꢀ
±±
±6
±1ꢁ
g
Nonlinearity
% of full scale
±ꢂ.2 ±1.2±
±1
±ꢂ.1
±ꢂ.2 ±1.2±
±1
±ꢂ.1
±ꢂ.2
±1
±ꢂ.1
±1.±
±1.2±
%
Package Alignment Error
Alignment Error (ADXL2ꢂ3)
Cross-Axis Sensitivity
SENSITIVITY (RATIOMETRIC)2
Sensitivity at XOUT, YOUT
Degrees
Degrees
%
X to Y sensor
±1.± ±3
±1.± ±3
±3
Each axis
VS = ± V
VS = ± V
96ꢂ
2.4
1ꢂꢂꢂ 1ꢂ4ꢂ
±ꢂ.3
293
2.4
312
331
94
1ꢂꢂ
±ꢂ.3
1ꢂ6
mV/g
%
Sensitivity Change Due to
Temperature3
±ꢂ.3
ZERO g BIAS LEVEL (RATIOMETRIC) Each axis
ꢂ g Voltage at XOUT, YOUT
Initial ꢂ g Output Deviation
From Ideal
VS = ± V
VS = ± V, 2±°C
2.±
2.6
2.±
2.6
2.4
2.±
±12±
2.6
2
V
mg
±2±
±±ꢂ
ꢂ g Offset vs. Temperature
±ꢂ.1 ±ꢂ.ꢁ
±ꢂ.3 ±1.ꢁ
±1
mg/°C
NOISE
Output Noise
Noise Density
<4 kHz, VS = ± V
1
3
1
3
mV rms
μg/√Hz
11ꢂ
2ꢂꢂ
13ꢂ
rms
FREQUENCY RESPONSE4
CX, CY Range±
RFILT Tolerance
Sensor Resonant Frequency
SELF TEST6
ꢂ.ꢂꢂ2
24
1ꢂ
4ꢂ
ꢂ.ꢂꢂ2
24
1ꢂ
4ꢂ
ꢂ.ꢂꢂ2
24
1ꢂ
4ꢂ
μF
kΩ
kHz
32
±.±
32
±.±
32
±.±
Logic Input Low
1
1
1
V
Logic Input High
4
4
4
V
ST Input Resistance to GND
Output Change at XOUT, YOUT
OUTPUT AMPLIFIER
Output Swing Low
Output Swing High
3ꢂ
4±ꢂ
±ꢂ
ꢀ±ꢂ
3ꢂ
12±
±ꢂ
2±ꢂ
3ꢂ
6ꢂ
±ꢂ
ꢁꢂ
kΩ
mV
ST ꢂ to ST 1
11ꢂꢂ
4.ꢁ
3ꢀ±
4.ꢁ
1ꢂꢂ
4.ꢁ
No load
No load
ꢂ.ꢂ±
3
ꢂ.2
4.±
ꢂ.ꢂ±
3
ꢂ.2
4.±
ꢂ.ꢂ±
3
ꢂ.2
4.±
V
V
POWER SUPPLY (VDD
)
Operating Voltage Range
Quiescent Supply Current
Turn-On Timeꢀ
6
1.1
6
1.1
6
1.1
V
mA
ms
ꢂ.ꢀ
2ꢂ
ꢂ.ꢀ
2ꢂ
ꢂ.ꢀ
2ꢂ
1 Guaranteed by measurement of initial offset and sensitivity.
2 Sensitivity is essentially ratiometric to VS. For VS = 4.ꢀ± V to ±.2± V, sensitivity is 1ꢁ6 mV/V/g to 21± 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).
± Bandwidth = 1/(2 × π × 32 kΩ × C). For CX, CY = ꢂ.ꢂꢂ2 μF, bandwidth = 2±ꢂꢂ Hz. For CX, CY = 1ꢂ μF, bandwidth = ꢂ.± Hz. Minimum/maximum values are not tested.
6 Self-test response changes cubically with VS.
ꢀ Larger values of CX, CY increase turn-on time. Turn-on time is approximately 16ꢂ × CX or CY + 4 ms, where CX, CY are in μF.
Rev. D | Page 3 of 16
ADXL±03/ADXL203
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Table 3. Package Characteristics
Package Type θJA
ꢁ-Terminal Ceramic LCC 12ꢂ°C/W 2ꢂ°C/W <1.ꢂ gram
Acceleration (Any Axis, Unpowered)
Acceleration (Any Axis, Powered)
Drop Test (Concrete Surface)
VS
3±ꢂꢂ g
3±ꢂꢂ g
1.2 m
−ꢂ.3 V to +ꢀ.ꢂ V
θJC
Device Weight
ESD CAUTION
All Other Pins
(COM − ꢂ.3 V) to
(VS + ꢂ.3 V)
Output Short-Circuit Duration
(Any Pin to Common)
Indefinite
Temperature Range (Powered)
Temperature Range (Storage)
−±±°C to +12±°C
−6±°C to +1±ꢂ°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.
CRITICAL ZONE
T
TO T
tP
L
P
T
P
RAMP-UP
T
L
tL
T
SMAX
T
SMIN
tS
RAMP-DOWN
PREHEAT
t
25°C TO PEAK
TIME
Figure 2. Recommended Soldering Profile
Table 4. Solder Profile Parameters
Test Condition
Profile Feature
Sn63/Pb37
Pb-Free
Average Ramp Rate (TL to TP)
Preheat
3°C/second maximum
3°C/second maximum
Minimum Temperature (TSMIN
)
1ꢂꢂ°C
1±ꢂ°C
1±ꢂ°C
2ꢂꢂ°C
Maximum Temperature (TSMAX
Time (TSMIN to TSMAX) (tS)
TSMAX to TL
)
6ꢂ seconds to 12ꢂ seconds
6ꢂ seconds to 1±ꢂ seconds
Ramp-Up Rate
3°C/second
3°C/second
Time Maintained above Liquidous (TL)
Liquidous Temperature (TL)
Time (tL)
1ꢁ3°C
21ꢀ°C
6ꢂ seconds to 1±ꢂ seconds
24ꢂ°C + ꢂ°C/−±°C
6ꢂ seconds to 1±ꢂ seconds
26ꢂ°C + ꢂ°C/−±°C
Peak Temperature (TP)
Time Within ±°C of Actual Peak Temperature (tP)
Ramp-Down Rate
1ꢂ seconds to 3ꢂ seconds
6°C/second maximum
6 minutes maximum
2ꢂ seconds to 4ꢂ seconds
6°C/second maximum
ꢁ minutes maximum
Time 2±°C to Peak Temperature
Rev. D | Page 4 of 16
Data Sheet
ADXL±03/ADXL203
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADXL103
ADXL203
TOP VIEW
TOP VIEW
(Not to Scale)
(Not to Scale)
V
S
V
S
8
8
ST
NC
1
2
3
7
6
5
X
1
7
ST
NC
X
Y
OUT
OUT
OUT
+Y
+X
NC
NC
2
3
6
5
+X
4
COM
COM
NC
4
NC
NC
NOTES
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 3. ADXL103 Pin Configuration
Figure 4. ADXL203 Pin Configuration
Table 6. ADXL203 Pin Function Descriptions
Table 5. ADXL103 Pin Function Descriptions
Pin No.
Mnemonic
Description
Pin No.
Mnemonic
Description
1
2
3
4
±
6
ꢀ
ꢁ
ST
NC
COM
NC
NC
YOUT
XOUT
VS
Self Test
Do Not Connect
Common
Do Not Connect
Do Not Connect
Y Channel Output
X Channel Output
3 V to 6 V
1
2
3
4
±
6
ꢀ
ꢁ
ST
Self Test
Do Not Connect
Common
Do Not Connect
Do Not Connect
Do Not Connect
X Channel Output
3 V to 6 V
NC
COM
NC
NC
NC
XOUT
VS
Rev. D | Page ± of 16
ADXL±03/ADXL203
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
ADXL103 AND ADXL203
VS = ± V for all graphs, unless otherwise noted.
25
30
25
20
15
20
15
10
5
10
5
0
0
ZERO g BIAS (V)
ZERO g BIAS (V)
Figure 5. X-Axis Zero g Bias Deviation from Ideal at 25°C
Figure 8. Y-Axis Zero g Bias Deviation from Ideal at 25°C
30
25
20
15
10
25
20
15
10
5
0
5
0
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE COEFFICIENT (mg/°C)
Figure 6. X-Axis Zero g Bias Temperature Coefficient
Figure 9. Y-Axis Zero g Bias Temperature Coefficient
40
35
30
25
20
40
35
30
25
20
15
10
15
10
5
0
5
0
SENSITIVITY (V/g)
SENSITIVITY (V/g)
Figure 7. X-Axis Sensitivity at 25°C
Figure 10. Y-Axis Sensitivity at 25°C
Rev. D | Page 6 of 16
Data Sheet
ADXL±03/ADXL203
2.60
1.03
1.02
1.01
1.00
0.99
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
0.98
0.97
2.42
2.40
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. Zero g Bias vs. Temperature; Parts Soldered to PCB
Figure 13. Sensitivity vs. Temperature; Parts Soldered to PCB
50
45
40
50
45
40
35
30
25
20
15
35
30
25
20
15
10
10
5
0
5
0
60
70
80
90
100 110 120 130 140 150
60
70
80
90
100 110 120 130 140 150
X AXIS NOISE DENSITY (mg/√Hz)
Y AXIS NOISE DENSITY (mg/√Hz)
Figure 12. X-Axis Noise Density at 25°C
Figure 14. Y-Axis Noise Density at 25°C
Rev. D | Page ꢀ of 16
ADXL±03/ADXL203
Data Sheet
45
45
40
35
30
25
20
40
35
30
25
20
15
15
10
5
10
5
0
0
SELF-TEST OUTPUT (V)
SELF-TEST OUTPUT (V)
Figure 15. X-Axis Self-Test Response at 25°C
Figure 17. Y-Axis Self-Test Response at 25°C
0.90
0.85
0.80
0.75
0.70
0.65
100
90
5V
80
3V
70
60
50
40
30
20
0.60
0.55
0.50
10
0
TEMPERATURE (°C)
CURRENT (µA)
Figure 18. Supply Current at 25°C
Figure 16. Self-Test Response vs. Temperature
Rev. D | Page ꢁ of 16
Data Sheet
ADXL±03/ADXL203
AD22293
60
70
60
50
40
30
20
10
0
50
40
30
20
10
0
ZERO g BIAS (V)
ZERO g BIAS (V)
Figure 22. Y-Axis Zero g Bias at 25°C
Figure 19. X-Axis Zero g Bias at 25°C
25
20
15
10
5
25
20
15
10
5
0
0
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE COEFFICIENT (mg/°C)
Figure 23. Y-Axis Zero g Bias Temperature Coefficient
Figure 20. X-Axis Zero g Bias Temperature Coefficient
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
SENSITIVITY (V/g)
SENSITIVITY (V/g)
Figure 24. Y-Axis Sensitivity at 25°C
Figure 21. X-Axis Sensitivity at 25°C
Rev. D | Page 9 of 16
ADXL±03/ADXL203
Data Sheet
AD22035 AND AD22037
60
60
50
40
30
20
10
0
50
40
30
20
10
0
ZERO g BIAS (mV)
ZERO g BIAS (mV)
Figure 25. X-Axis Zero g Bias Deviation from Ideal at 25°C
Figure 28. Y-Axis Zero g Bias Deviation from Ideal at 25°C
35
30
25
20
15
10
5
35
30
25
20
15
10
5
0
0
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE COEFFICIENT (mg/°C)
Figure 26. X-Axis Zero g Bias Temperature Coefficient
Figure 29. Y-Axis Zero g Bias Temperature Coefficient
25
20
15
10
5
25
20
15
10
5
0
0
SENSITIVITY (mV/g)
SENSITIVITY (mV/g)
Figure 30. Y-Axis Sensitivity at 25°C
Figure 27. X-Axis Sensitivity at 25°C
Rev. D | Page 1ꢂ of 16
Data Sheet
ADXL±03/ADXL203
40
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
0
0
SELF-TEST OUTPUT (V)
SELF-TEST OUTPUT (V)
Figure 31. X-Axis Self Test Response at 25°C
Figure 33. Y-Axis Self Test Response at 25°C
101.0
90
80
70
60
50
40
30
20
10
0
25°C
105°C
100.5
100.0
99.5
99.0
98.5
98.0
97.5
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
CURRENT (µA)
Figure 34. Supply Current vs. Temperature
Figure 32. Sensitivity vs. Temperature; Parts Soldered to PCB
Rev. D | Page 11 of 16
ADXL±03/ADXL203
Data Sheet
ALL MODELS
40
40
35
30
25
20
15
35
30
25
20
15
10
5
10
5
0
0
PERCENT SENSITIVITY (%)
PERCENT SENSITIVITY (%)
Figure 35. Z vs. X Cross-Axis Sensitivity
Figure 37. Z vs. Y Cross-Axis Sensitivity
0.9
0.8
0.7
0.6
V
= 5V
S
0.5
V
= 3V
S
0.4
0.3
–50
0
50
TEMPERATURE (°C)
100
150
TIME
Figure 36. Supply Current vs. Temperature
Figure 38. Turn-On Time; CX, CY = 0.1 μF, Time Scale = 2 ms/DIV
Rev. D | Page 12 of 16
Data Sheet
ADXL±03/ADXL203
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 ±1ꢀ g. The
accelerometer can measure static acceleration forces, such
as gravity, allowing it to be used as a tilt sensor.
The output of the demodulator is amplified and brought off-chip
through a 32 kΩ 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 mg over the −40°C
to +12±°C temperature range).
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 1ꢀ0° 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.
Figure 11 shows the 0 g output performance of eight parts
(x and y axes) over a −40°C to +12±°C temperature range.
Figure 13 demonstrates the typical sensitivity shift over
temperature for VS = ± V. Sensitivity stability is optimized for
VS = ± V but is still very good over the specified range; it is
typically better than ±1ꢁ over temperature at VS = 3 V.
PIN 8
X
Y
= –1g
= 0g
OUT
OUT
PIN 8
PIN 8
TOP VIEW
(Not to Scale)
X
Y
= 0g
= –1g
X
= 0g
OUT
OUT
OUT
Y
= +1g
OUT
X
Y
= 0g
= 0g
OUT
OUT
PIN 8
X
Y
= +1g
= 0g
OUT
OUT
EARTH’S SURFACE
Figure 39. Output Response vs. Orientation
Rev. D | Page 13 of 16
ADXL±03/ADXL203
Data Sheet
APPLICATIONS INFORMATION
DESIGN TRADE-OFFS FOR SELECTING FILTER
CHARACTERISTICS: THE NOISE/BANDWIDTH
TRADE-OFF
POWER SUPPLY DECOUPLING
For most applications, a single 0.1 μF capacitor, CDC, 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 Ω
(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 μF to 22 μF range) can be added in
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 XOUT and YOUT
.
The output of the ADXL103/ADXL203 has a typical bandwidth
of 2.± 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.
parallel to CDC
.
SETTING THE BANDWIDTH USING CX AND CY
The ADXL103/ADXL203 has provisions for band limiting the
XOUT and YOUT pins. Capacitors must be added at these pins to
The ADXL103/ADXL203 noise has the characteristics of white
Gaussian noise, which contributes equally at all frequencies and is
described in terms of μg/√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.
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)
or more simply,
–3 dB = ± μF/C(X, Y)
)
f
With the single-pole roll-off characteristic, the typical noise of
the ADXL103/ADXL203 is determined by
The tolerance of the internal resistor (RFILT) can vary typically as
much as ±2±ꢁ of its nominal value (32 kΩ); thus, the bandwidth
varies accordingly. A minimum capacitance of 2000 pF for CX and
CY is required in all cases.
rmsNoise = (110 μg/√Hz) × ( BW ×1.6 )
At 100 Hz, the noise is
Table 7. Filter Capacitor Selection, CX and CY
rmsNoise = (110 μg/√Hz) × ( 100×1.6 ) = 1.4 mg
Bandwidth (Hz)
Capacitor (μF)
Often, the peak value of the noise is desired. Peak-to-peak noise
can only be estimated by statistical methods. Table ꢀ is useful
for estimating the probabilities of exceeding various peak values,
given the rms value.
1
1ꢂ
±ꢂ
1ꢂꢂ
2ꢂꢂ
±ꢂꢂ
4.ꢀ
ꢂ.4ꢀ
ꢂ.1ꢂ
ꢂ.ꢂ±
ꢂ.ꢂ2ꢀ
ꢂ.ꢂ1
Table 8. Estimation of Peak-to-Peak Noise
% of Time That Noise Exceeds
Peak-to-Peak Value
2 × rms
Nominal Peak-to-Peak Value
SELF TEST
32
The ST pin controls the self test feature. When this pin is set to VS,
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
7±0 mg (corresponding to 7±0 mV). This pin can be left open-
circuit or connected to common in normal use.
4 × rms
6 × rms
ꢁ × rms
4.6
ꢂ.2ꢀ
ꢂ.ꢂꢂ6
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 CX and CY values.
Never expose the ST pin to voltages greater than VS + 0.3 V. If
the system design is such that this condition cannot be guaranteed
(that is, multiple supply voltages are present), a low VF clamping
diode between ST and VS is recommended.
Table 9. Filter Capacitor Selection (CX, CY)
CX, CY RMS Noise Peak-to-Peak Noise
Bandwidth (Hz) (μF)
(mg)
Estimate (mg)
1ꢂ
±ꢂ
ꢂ.4ꢀ
ꢂ.1
ꢂ.4
1.ꢂ
2.6
6
1ꢂꢂ
±ꢂꢂ
ꢂ.ꢂ4ꢀ 1.4
ꢂ.ꢂ1 3.1
ꢁ.4
1ꢁ.ꢀ
Rev. D | Page 14 of 16
Data Sheet
ADXL±03/ADXL203
USING THE ADXL103/ADXL203 WITH OPERATING
VOLTAGES OTHER THAN 5 V
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.
The ADXL103/ADXL203 is tested and specified at VS = ± 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.
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.± mg per degree of tilt. At 4±°, its output changes at
only 12.2 mg per degree, and resolution declines.
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 ±60 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.
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
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
VS = 3 V, the self test response is approximately equivalent to
1±0 mV or equivalent to 270 mg (typical).
PITCH = ASIN(AX/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.
The supply current decreases as the supply voltage decreases.
Typical current consumption at VDD = 3 V is 4±0 μA.
Rev. D | Page 1± of 16
ADXL±03/ADXL203
Data Sheet
OUTLINE DIMENSIONS
0.030
0.025
0.020
(PLATING OPTION 1,
SEE DETAIL A
FOR OPTION 2)
0.087
0.078
0.069
0.028
0.020 DIA
0.012
0.203
0.197 SQ
0.193
0.054
0.050
0.046
0.020
0.015
0.010
(R 4 PLCS)
1
3
7
5
0.180
0.177 SQ
0.174
0.106
0.100
0.094
0.075 REF
R 0.008
(8 PLCS)
0.008
0.006
0.004
TOP VIEW
BOTTOM VIEW
R 0.008
(4 PLCS)
0.077
0.070
0.063
0.019 SQ
DETAIL A
(OPTION 2)
Figure 40. 8-Terminal Ceramic Leadless Chip Carrier [LCC]
(E-8-1)
Dimensions shown in inches
ORDERING GUIDE
Device
Axes Generic
Specified
Voltage (V)
Package
Model1, 2
g-Range
±1.ꢀ
±1.ꢀ
±1.ꢀ
±1ꢁ
±1ꢁ
±1ꢁ
±1ꢁ
±1ꢁ
Temperature Range
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
–4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
Package Description
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
Evaluation Board
Option
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
ADXL1ꢂ3CE
1
1
1
1
1
1
1
1
1
2
2
2
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL1ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
±
±
±
±
±
±
±
±
±
±
±
±
ADXL1ꢂ3CE–REEL
ADXL1ꢂ3WCEZB-REEL
AD22ꢂ3±Z
AD22ꢂ3±Z-RL
AD22ꢂ3±Z-RLꢀ
ADW22ꢂ3±Z
ADW22ꢂ3±Z-RL
ADW22ꢂ3±Z-RLꢀ
ADXL2ꢂ3CE
ADXL2ꢂ3CE-REEL
ADXL2ꢂ3WCEZB-REEL
ADXL2ꢂ3EB
±1ꢁ
±1.ꢀ
±1.ꢀ
±1.ꢀ
AD22293ZA
ADW22293ZA
AD22ꢂ3ꢀZ
AD22ꢂ3ꢀZ-RL
AD22ꢂ3ꢀZ-RLꢀ
ADW22ꢂ3ꢀZ
ADW22ꢂ3ꢀZ-RL
ADW22ꢂ3ꢀZ-RLꢀ
2
2
2
2
2
2
2
2
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
ADXL2ꢂ3
±±
±±
±
±
±
±
±
±
±
±
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
−4ꢂ°C to +12±°C
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
ꢁ-Terminal Ceramic LCC
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
E-ꢁ-1
±1ꢁ
±1ꢁ
±1ꢁ
±1ꢁ
±1ꢁ
±1ꢁ
1 Z = RoHS Compliant Part.
2 W = Qualified for Automotive Applications.
AUTOMOTIVE PRODUCTS
The ADXL103W, ADW2203±, 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 specific
product ordering information and to obtain the specific Automotive Reliability reports for these models.
©2004–2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D03757-0-9/11(D)
Rev. D | Page 16 of 16
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