ADXL330KCPZ [ADI]
Small, Low Power, 3-Axis 【3 g i MEMS Accelerometer; 小尺寸，低功耗， 3轴【 3 GI MEMS加速度计
| 型号： | ADXL330KCPZ |
| 厂家： | 
ADI |
| 描述： | Small, Low Power, 3-Axis 【3 g i MEMS Accelerometer |
| 文件： | 总16页 (文件大小：317K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Small, Low Power, 3-Axis 3 g
iMEMS® Accelerometer
ADXL330
FEATURES
GENERAL DESCRIPTION
3-axis sensing
The ADXL330 is a small, thin, low power, complete three axis
accelerometer with signal conditioned voltage outputs, all
on a single monolithic IC. The product measures acceleration
with a minimum full-scale range of 3 g. It can measure the
static acceleration of gravity in tilt-sensing applications, as well
as dynamic acceleration resulting from motion, shock, or
vibration.
Small, low-profile package
4 mm × 4 mm × 1.45 mm LFCSP
Low power
200 μA at VS = 2.0 V (typical)
Single-supply operation
2.0 V to 3.6 V
10,000 g shock survival
Excellent temperature stability
BW adjustment with a single capacitor per axis
RoHS/WEEE lead-free compliant
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 1,600 Hz for X and Y axes, and a range of
0.5 Hz to 550 Hz for the Z axis.
APPLICATIONS
Cost-sensitive, low power, motion- and tilt-sensing
applications
Mobile devices
The ADXL330 is available in a small, low-profile, 4 mm × 4 mm
× 1.45 mm, 16-lead, plastic lead frame chip scale package
(LFCSP_LQ).
Gaming systems
Disk drive protection
Image stabilization
Sports and health devices
FUNCTIONAL BLOCK DIAGRAM
+3V
V
S
R
R
R
X
Y
Z
FILT
FILT
FILT
ADXL330
OUT
OUTPUT AMP
OUTPUT AMP
OUTPUT AMP
C
X
Y
Z
3-AXIS
SENSOR
OUT
C
AC AMP
DEMOD
DC
C
OUT
C
COM
ST
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 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
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
ADXL330
TABLE OF CONTENTS
Features .............................................................................................. 1
Performance................................................................................ 11
Applications..................................................................................... 12
Power Supply Decoupling ......................................................... 12
Setting the Bandwidth Using CX, CY and CZ ........................... 12
Self-Test ....................................................................................... 12
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 11
Mechanical Sensor...................................................................... 11
Design Trade-Offs for Selecting Filter Characteristics: The
Noise/BW Trade-Off.................................................................. 12
Use with Operating Voltages Other than 3 V............................. 12
Axes of Acceleration Sensitivity ............................................... 13
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
3/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
ADXL330
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
Conditions
Min
Typ
Max
Unit
SENSOR INPUT
Each axis
Measurement Range
3
3.6
0.3
1
0.1
1
g
Nonlinearity
% of full scale
%
Package Alignment Error
Inter-Axis Alignment Error
Cross Axis Sensitivity1
SENSITIVITY (RATIOMETRIC)2
Sensitivity at XOUT, YOUT, ZOUT
Sensitivity Change Due to Temperature3
ZERO g BIAS LEVEL (RATIOMETRIC)
0 g Voltage at XOUT, YOUT, ZOUT
0 g Offset vs. Temperature
NOISE PERFORMANCE
Noise Density XOUT, YOUT
Noise Density ZOUT
Degrees
Degrees
%
Each axis
VS = 3 V
VS = 3 V
Each axis
VS = 3 V
270
1.2
300
0.01ꢀ
330
1.8
mV/g
%/°C
1.ꢀ
1
V
mg/°C
280
3ꢀ0
μg/√Hz rms
μg/√Hz rms
FREQUENCY RESPONSE4
ꢀ
Bandwidth XOUT, YOUT
No external filter
No external filter
1600
ꢀꢀ0
Hz
ꢀ
Bandwidth ZOUT
Hz
RFILT Tolerance
Sensor Resonant Frequency
SELF-TEST6
32 1ꢀ%
ꢀ.ꢀ
kΩ
kHz
Logic Input Low
Logic Input High
+0.6
+2.4
+60
−1ꢀ0
+1ꢀ0
−60
V
V
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
ꢁA
mV
mV
mV
Self-test 0 to 1
Self-test 0 to 1
Self-test 0 to 1
No load
No load
0.1
2.8
V
V
Operating Voltage Range
Supply Current
Turn-On Time7
2.0
3.6
V
ꢁA
ms
VS = 3 V
320
1
No external filter
TEMPERATURE
Operating Temperature Range
−2ꢀ
+70
°C
1 Defined as coupling between any two axes.
2 Sensitivity is essentially ratiometric to VS.
3 Defined as the output change from ambient-to-maximum temperature or ambient-to-minimum temperature.
4 Actual frequency response controlled by user-supplied external filter capacitors (CX, CY, CZ).
ꢀ 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 = ꢀ00 Hz. For CX, CY, CZ = 10 μF,
bandwidth = 0.ꢀ Hz.
6 Self-test response changes cubically with VS.
7 Turn-on time is dependent on CX, CY, CZ and is approximately 160 × CX or CY or CZ + 1 ms, where CX, CY, CZ are in μF.
Rev. 0 | Page 3 of 16
ADXL330
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
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.
Rating
Acceleration (Any Axis, Unpowered)
Acceleration (Any Axis, Powered)
VS
All Other Pins
Output Short-Circuit Duration
(Any Pin to Common)
10,000 g
10,000 g
−0.3 V to +7.0 V
(COM − 0.3 V) to (VS + 0.3 V)
Indefinite
Temperature Range (Powered)
Temperature Range (Storage)
−55°C to +125°C
−65°C to +150°C
CRITICAL ZONE
tP
T
TO T
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 3. Recommended Soldering Profile
Profile Feature
Sn63/Pb37
Pb-Free
Average Ramp Rate (TL to TP)
Preheat
3°C/s max
3°C/s max
Minimum Temperature (TSMIN
Maximum Temperature (TSMAX
Time (TSMIN to TSMAX), tS
)
100°C
150°C
60 s to 120 s
150°C
200°C
60 s to 180 s
)
TSMAX to TL
Ramp-Up Rate
3°C/s max
3°C/s max
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
183°C
60 s to 150 s
240°C + 0°C/−5°C
10 s to 30 s
6°C/s max
217°C
60 s to 150 s
260°C + 0°C/−5°C
20 s to 40 s
6°C/s max
Time 25°C to Peak Temperature
6 minutes max
8 minutes max
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 4 of 16
ADXL330
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
0.50
MAX
4
0.65
0.325
16
15
14
13
ADXL330
1
2
3
4
12
NC
ST
X
OUT
0.35
MAX
TOP VIEW
(Not to Scale)
11
10
NC
Y
0.65
+Y
COM
NC
+Z
+X
OUT
4
9
NC
5
6
7
8
1.95
0.325
CENTER PAD IS NOT
NC = NO CONNECT
INTERNALLY CONNECTED
BUT SHOULD BE SOLDERED
FOR MECHANICAL INTEGRITY
1.95
DIMENSIONS SHOWN IN MILLIMETERS
Figure 4. Recommended PCB Layout
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
No Connect
Self-Test
1
2
NC
ST
3
4
5
6
7
8
9
10
11
12
13
14
15
16
COM
NC
Common
No Connect
Common
Common
Common
Z Channel Output
No Connect
Y Channel Output
No Connect
X Channel Output
No Connect
Supply Voltage (2.0 V to 3.6 V)
Supply Voltage (2.0 V to 3.6 V)
No Connect
COM
COM
COM
ZOUT
NC
YOUT
NC
XOUT
NC
VS
VS
NC
Rev. 0 | Page 5 of 16
ADXL330
TYPICAL PERFORMANCE CHARACTERISTICS
N > 1000 for all typical performance plots, unless otherwise noted.
35
16
14
12
10
8
30
25
20
15
10
5
6
4
2
0
0
1.42
1.44
1.46
1.48
1.50
1.52
1.54
1.56
1.58
0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09
OUTPUT (V)
OUTPUT (V)
Figure 5. X-Axis Zero g Bias at 25°C, VS = 3 V
Figure 8. X-Axis Zero g Bias at 25°C, VS = 2 V
40
35
30
25
20
15
10
5
16
14
12
10
8
6
4
2
0
0
1.42
1.44
1.46
1.48
1.50
1.52
1.54
1.56
1.58
0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09
OUTPUT (V)
OUTPUT (V)
Figure 6. Y-Axis Zero g Bias at 25°C, VS = 3 V
Figure 9. Y-Axis Zero g Bias at 25°C, VS = 2 V
40
35
30
25
20
15
10
5
25
20
15
10
5
0
0
1.42
1.44
1.46
1.48
1.50
1.52
1.54
1.56
1.58
0.88 0.90 0.92 0.94 0.96 0.98 1.00 1.02 1.04 1.06 1.08 1.10 1.12 1.14 1.16
OUTPUT (V)
OUTPUT (V)
Figure 7. Z-Axis Zero g Bias at 25°C, VS = 3 V
Figure 10. Z-Axis Zero g Bias at 25°C, VS = 2 V
Rev. 0 | Page 6 of 16
ADXL330
35
30
25
20
15
10
5
1.55
1.54
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
N = 8
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
–30 –20 –10
0
10
20
30
40
50
60
70
80
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE (°C)
Figure 11. X-Axis Zero g Bias Temperature Coefficient, VS = 3 V
Figure 14. X-Axis Zero g Bias vs. Temperature—8 Parts Soldered to PCB
40
35
30
25
20
15
10
5
1.55
N = 8
1.54
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
–30 –20 –10
0
10
20
30
40
50
60
70
80
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE (°C)
Figure 12. Y-Axis Zero g Bias Temperature Coefficient, VS = 3 V
Figure 15. Y-Axis Zero g Bias vs. Temperature—8 Parts Soldered to PCB
30
25
20
15
10
5
1.55
N = 8
1.54
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
–30 –20 –10
0
10
20
30
40
50
60
70
80
TEMPERATURE COEFFICIENT (mg/°C)
TEMPERATURE (°C)
Figure 13. Z-Axis Zero g Bias Temperature Coefficient, VS = 3 V
Figure 16. Z-Axis Zero g Bias vs. Temperature—8 Parts Soldered to PCB
Rev. 0 | Page 7 of 16
ADXL330
60
50
40
30
20
10
35
30
25
20
15
10
5
0
0
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.33
0.34
0.34
0.33
0.170 0.174 0.178 0.182 0.186 0.190 0.194 0.198 0.202 0.206 0.210
SENSITIVITY (V/g)
SENSITIVITY (V/g)
Figure 17. X-Axis Sensitivity at 25°C, VS = 3 V
Figure 20. X-Axis Sensitivity at 25°C, VS = 2 V
70
60
50
40
30
20
10
40
35
30
25
20
15
10
5
0
0
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.33
0.170 0.174 0.178 0.182 0.186 0.190 0.194 0.198 0.202 0.206 0.210
SENSITIVITY (V/g)
SENSITIVITY (V/g)
Figure 18. Y-Axis Sensitivity at 25°C, VS = 3 V
Figure 21. Y-Axis Sensitivity at 25°C, VS = 2 V
70
60
50
40
30
20
10
40
35
30
25
20
15
10
5
0
0
0.25
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.172 0.176 0.180 0.184 0.188 0.192 0.196 0.200 0.204 0.208 0.212
SENSITIVITY (V/g)
SENSITIVITY (V/g)
Figure 19. Z-Axis Sensitivity at 25°C, VS = 3 V
Figure 22. Z-Axis Sensitivity at 25°C, VS = 2 V
Rev. 0 | Page 8 of 16
ADXL330
90
80
70
60
50
40
30
20
10
0
0.33
0.32
0.31
0.30
0.29
0.28
0.27
N = 8
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
–30 –20 –10
0
10
20
30
40
50
60
70
80
DRIFT (%)
TEMPERATURE (°C)
Figure 23. X-Axis Sensitivity Drift Over Temperature, VS = 3 V
Figure 26. X-Axis Sensitivity vs. Temperature
8 Parts Soldered to PCB, VS = 3 V
70
60
50
40
30
20
10
0
0.33
0.32
0.31
0.30
0.29
0.28
0.27
N = 8
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
–30 –20 –10
0
10
20
30
40
50
60
70
80
DRIFT (%)
TEMPERATURE (°C)
Figure 24. Y-Axis Sensitivity Drift Over Temperature, VS = 3 V
Figure 27. Y-Axis Sensitivity vs. Temperature
8 Parts Soldered to PCB, VS = 3 V
25
0.33
0.32
0.31
0.30
0.29
0.28
0.27
N = 8
20
15
10
5
0
–1.0 –0.6 –0.2 0.2 0.6 1.0 1.4 1.8 2.2 2.6 3.0
–30 –20 –10
0
10
20
30
40
50
60
70
80
DRIFT (%)
TEMPERATURE (°C)
Figure 25. Z-Axis Sensitivity Drift Over Temperature, VS = 3 V
Figure 28. Z-Axis Sensitivity vs. Temperature
8 Parts Soldered to PCB, VS = 3 V
Rev. 0 | Page 9 of 16
ADXL330
600
500
400
300
200
100
T
4
3
2
1
0
0
B
B
W
CH1 1.00V W CH2 500mV
CH3 500mV CH4 500mV
M1.00ms
9.400%
A CH1
300mV
1
2
3
4
5
6
T
SUPPLY (V)
Figure 30. Typical Turn-On Time—CX, CY, CZ = 0.0047 μF, VS = 3 V
Figure 29. Typical Current Consumption vs. Supply Voltage
Rev. 0 | Page 10 of 16
ADXL330
THEORY OF OPERATION
The ADXL330 is a complete 3-axis acceleration measurement
system on a single monolithic IC. The ADXL330 has a measure-
ment 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 accelera-
tion of gravity in tilt sensing applications as well as dynamic
acceleration resulting from motion, shock, or vibration.
MECHANICAL SENSOR
The ADXL330 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 mis-
alignment of the sensor die to the package is the chief source
of cross axis sensitivity. Mechanical misalignment can, of
course, be calibrated out at the system level.
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques ensure high
performance is built-in to the ADXL330. 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 +70°C temperature range).
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 meas-
ured 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.
Figure 14, Figure 15, and Figure 16 show the zero g output
performance of eight parts (X-, Y-, and Z-axis) soldered to a
PCB over a −25°C to +70°C temperature range.
Figure 26, Figure 27, and Figure 28 demonstrate the typical
sensitivity shift over temperature for supply voltages of 3 V. This
is typically better than 1ꢀ over the −25°C to +70°C
temperature range.
The demodulator output is amplified and brought off-chip
through a 32 kΩ resistor. The user then sets the signal band-
width of the device by adding a capacitor. This filtering improves
measurement resolution and helps prevent aliasing.
Rev. 0 | Page 11 of 16
ADXL330
APPLICATIONS
POWER SUPPLY DECOUPLING
instance, if there are multiple supply voltages), then a low VF
clamping diode between ST and VS is recommended.
For most applications, a single 0.1 μF capacitor, CDC, placed
close to the ADXL330 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 as 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 ADXL330 ground to the power supply
ground is low impedance because noise transmitted through
ground has a similar effect as noise transmitted through VS.
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 ADXL330 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 further decreased to
reduce noise and improve resolution.
SETTING THE BANDWIDTH USING CX, CY, AND CZ
The ADXL330 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
,
The ADXL330 noise has the characteristics of white Gaussian
noise, which contributes equally at all frequencies and is
described in terms of ꢀg/√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 applica-
tion to maximize the resolution and dynamic range of the
accelerometer.
F
−3 dB = 1/(2π(32 kΩ) × C(X, Y, Z)
or more simply
–3 dB = 5 ꢀF/C(X, Y, Z)
The tolerance of the internal resistor (RFILT) typically varies as
)
F
With the single-pole, roll-off characteristic, the typical noise of
the ADXL330 is determined by
much as 15% of its nominal value (32 kΩ), and the bandwidth
varies accordingly. A minimum capacitance of 0.0047 ꢀF for CX,
CY, and CZ is recommended in all cases.
rms Noise = Noise Density × ( BW ×1.6)
Often, the peak value of the noise is desired. Peak-to-peak noise
can only be estimated by statistical methods. Table 6 is useful
for estimating the probabilities of exceeding various peak
values, given the rms value.
Table 5. Filter Capacitor Selection, CX, CY, and CZ
Bandwidth (Hz)
Capacitor (μF)
1
4.7
10
50
100
200
500
0.47
0.10
0.05
0.027
0.01
Table 6. Estimation of Peak-to-Peak Noise
% of Time that Noise Exceeds
Nominal Peak-to-Peak Value
Peak-to-Peak Value
2 × rms
32
4 × rms
4.6
6 × rms
8 × rms
0.27
0.006
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
−500 mg (corresponding to −150 mV) in the X-axis, 500 mg (or
150 mV) on the Y-axis, and −200 mg (or −60 mV) on the Z-axis.
This ST pin may be left open circuit or connected to common
(COM) in normal use.
USE WITH OPERATING VOLTAGES OTHER THAN 3 V
The ADXL330 is tested and specified at VS = 3 V; however, it
can be powered with VS as low as 2 V or as high as 3.6 V. Note
that some performance parameters change as the supply voltage
is varied.
Never expose the ST pin to voltages greater than VS + 0.3 V. If
this cannot be guaranteed due to the system design (for
Rev. 0 | Page 12 of 16
ADXL330
At VS = 2 V, the self-test response is approximately −60 mV for
the X-axis, +60 mV for the Y-axis, and −25 mV for the Z-axis.
The ADXL330 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.
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.
The zero g bias output is also ratiometric, so the zero g output is
nominally equal to VS/2 at all supply voltages.
AXES OF ACCELERATION SENSITIVITY
A
Z
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
X- and Y-axis noise density is typically 230 μg/√Hz, while at
VS = 2 V, the X- and Y-axis noise density is typically 350 ꢁg/√Hz.
A
Y
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 ADXL330 is
approximately −275 mV for the X-axis, +275 mV for the Y-axis,
and −100 mV for the Z-axis.
TO
P
A
X
Figure 31. Axes of Acceleration Sensitivity, Corresponding Output Voltage
Increases When Accelerated Along the Sensitive Axis
X
Y
Z
= –1g
= 0g
= 0g
OUT
OUT
OUT
TOP
GRAVITY
X
Y
Z
= 0g
= –1g
= 0g
X
Y
Z
= 0g
= 1g
= 0g
OUT
OUT
OUT
TOP
TOP
OUT
OUT
OUT
TOP
X
Y
Z
= 1g
= 0g
= 0g
OUT
OUT
OUT
T
O
P
X
Y
Z
= 0g
= 0g
= 1g
X
Y
Z
= 0g
= 0g
= –1g
OUT
OUT
OUT
OUT
OUT
OUT
Figure 32. Output Response vs. Orientation to Gravity
Rev. 0 | Page 13 of 16
ADXL330
OUTLINE DIMENSIONS
0.20 MIN
13
PIN 1
INDICATOR
0.20 MIN
0.65 BSC
16
PIN 1
1
4
12
9
4.15
4.00 SQ
3.85
INDICATOR
2.43
1.75 SQ
1.08
TOP
VIEW
BOTTOM
VIEW
8
5
0.55
0.50
0.45
1.95 BSC
0.05 MAX
0.02 NOM
1.50
1.45
1.40
0.35
0.30
0.25
COPLANARITY
0.05
SEATING
PLANE
Figure 33. 16-Lead Lead Frame Chip Scale Package [LFCSP_LQ]
4 mm × 4 mm Body, Thick Quad
(CP-16-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model
Measurement Range Specified Voltage
Temperature Range Package Description Package Option
ADXL330KCPZ1
ADXL330KCPZ–RL1
EVAL-ADXL330
3 g
3 g
3 V
3 V
−25°C to +70°C
−25°C to +70°C
16-Lead LFCSP_LQ
16-Lead LFCSP_LQ
Evaluation Board
CP-16-5
CP-16-5
1 Z = Pb-free part.
Rev. 0 | Page 14 of 16
ADXL330
NOTES
Rev. 0 | Page 15 of 16
ADXL330
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05677-0-3/06(0)
Rev. 0 | Page 16 of 16
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