ADXL323KCPZ [ADI]
Small, Low Power, 2-Axis 【3 g i MEMS Accelerometer; 小尺寸，低功耗， 2轴【 3 GI MEMS加速度计
| 型号： | ADXL323KCPZ |
| 厂家： | 
ADI |
| 描述： | Small, Low Power, 2-Axis 【3 g i MEMS Accelerometer |
| 文件： | 总16页 (文件大小：238K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Small, Low Power, 2-Axis ± ± g
iMEMS® Accelerometer
ADXL±2±
FEATURES
GENERAL DESCRIPTION
2-axis sensing
The ADXL323 is a small, thin, low power, complete 2-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_LQ
Low power
180 μA at VS = 1.8 V (typical)
Single-supply operation
1.8 V to 5.25 V
10,000 g shock survival
The user selects the bandwidth of the accelerometer using the
CX and CY capacitors at the XOUT and YOUT pins. Bandwidths
can be selected to suit the application, with a range of 0.5 Hz
to 1600 Hz.
Excellent temperature stability
BW adjustment with a single capacitor per axis
RoHS/WEEE lead-free compliant
APPLICATIONS
Cost-sensitive, low power, motion- and tilt-sensing
applications
The ADXL323 is available in a small, low profile, 4 mm ×
4 mm × 1.45 mm, 16-lead, plastic lead frame chip scale package
(LFCSP_LQ).
Mobile devices
Gaming systems
Disk drive protection
Image stabilization
Sports and health devices
FUNCTIONAL BLOCK DIAGRAM
+3V
V
S
ADXL323
R
R
X
Y
FILT
OUT
OUTPUT AMP
OUTPUT AMP
2-AXIS
SENSOR
C
X
Y
C
AC AMP
DEMOD
DC
FILT
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.
ADXL±2±
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
8/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
ADXL±2±
SPECIFICATIONS
TA = 25°C, VS = 3 V, CX = CY = 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
Sensitivity Change Due to Temperature3
ZERO g BIAS LEVEL (RATIOMETRIC)
0 g Voltage at XOUT, YOUT
0 g Offset vs. Temperature
NOISE PERFORMANCE
Noise Density XOUT, YOUT
FREQUENCY RESPONSE4
Degrees
Degrees
%
Each axis
VS = 3 V
VS = 3 V
Each axis
VS = 3 V
270
300
0.01ꢀ
330
mV/g
%/°C
1.3ꢀ
1.ꢀ
0.6
1.6ꢀ
V
mg/°C
280
μg/√Hz rms
ꢀ
Bandwidth XOUT, YOUT
No external filter
1600
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
V
V
ST Actuation Current
Output Change at XOUT
Output Change at YOUT
OUTPUT AMPLIFIER
Output Swing Low
Output Swing High
POWER SUPPLY
ꢁA
mV
mV
Self Test 0 to Self Test 1
Self Test 0 to Self Test 1
No load
No load
0.1
2.8
V
V
Operating Voltage Range
Supply Current
Turn-On Time7
1.8
ꢀ.2ꢀ
+70
V
ꢁA
ms
VS = 3 V
320
1
No external filter
TEMPERATURE
Operating Temperature Range
−2ꢀ
°C
1 Defined as coupling between 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).
ꢀ Bandwidth with external capacitors = 1/(2 × π × 32 kΩ × C). For CX, CY = 0.003 μF, bandwidth = 1.6 kHz. For CX, CY = 10 μF, bandwidth = 0.ꢀ Hz.
6 Self-test response changes cubically with VS.
7 Turn-on time is dependent on CX, CY and is approximately 160 × CX or CY + 1 ms, where CX, CY are in μF.
Rev. 0 | Page 3 of 16
ADXL±2±
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)
−ꢀꢀ°C to +12ꢀ°C
−6ꢀ°C to +1ꢀ0°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/sec max
3°C/sec max
Minimum Temperature (TSMIN
Maximum Temperature (TSMAX
)
100°C
1ꢀ0°C
1ꢀ0°C
200°C
)
Time (TSMIN to TSMAX), tS
TSMAX to TL
Ramp-Up Rate
Time Maintained Above Liquidous (TL)
Liquidous Temperature (TL)
Time (tL)
Peak Temperature (TP)
Time within ꢀ°C of Actual Peak Temperature (tP)
Ramp-Down Rate
60 sec to 120 s
3°C/sec max
183°C
60 sec to 1ꢀ0 sec
240°C + 0°C/−ꢀ°C
10 sec to 30 sec
6°C/sec max
60 sec to 180 sec
3°C/sec max
217°C
60 sec to 1ꢀ0 sec
260°C + 0°C/−ꢀ°C
20 sec to 40 sec
6°C/sec max
Time 2ꢀ°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
ADXL±2±
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
0.50
MAX
4
0.65
0.325
0.35
MAX
0.65
16
15
14
13
4
ADXL323
1
2
3
4
12
NC
ST
X
OUT
1.95
TOP VIEW
(Not to Scale)
0.325
11
10
NC
Y
+Y
COM
NC
CENTER PAD IS NOT
OUT
INTERNALLY CONNECTED
BUT SHOULD BE SOLDERED
FOR MECHANICAL INTEGRITY
+X
6
9
NC
5
7
8
1.95
DIMENSIONS SHOWN IN MILLIMETERS
NC = NO CONNECT
Figure 4. Recommended PCB Layout
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
NC
No Connect
2
ST
Self Test
3
4
COM
NC
Common
No Connect
ꢀ
6
7
8
COM
COM
COM
NC
Common
Common
Common
No Connect
9
NC
No Connect
10
11
12
13
14
1ꢀ
16
YOUT
NC
XOUT
NC
VS
VS
Y Channel Output
No Connect
X Channel Output
No Connect
Supply Voltage (1.8 V to ꢀ.2ꢀ V)
Supply Voltage (1.8 V to ꢀ.2ꢀ V)
No Connect
NC
Rev. 0 | Page ꢀ of 16
ADXL±2±
TYPICAL PERFORMANCE CHARACTERISTICS
N > 1000 for all typical performance plots, unless otherwise noted.
16
16
14
12
10
8
14
12
10
8
6
6
4
4
2
2
0
0
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
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 = 2 V
Figure 8. Y-Axis Zero g Bias at 25°C, VS = 2 V
40
35
30
25
20
15
10
5
35
30
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
1.42
1.44
1.46
1.48
1.50
1.52
1.54
1.56
1.58
OUTPUT (V)
OUTPUT (V)
Figure 6. X-Axis Zero g Bias at 25°C, VS = 3 V
Figure 9. Y-Axis Zero g Bias at 25°C, VS = 3 V
30
25
20
15
10
5
30
25
20
15
10
5
0
0
2.30 2.34 2.38 2.42 2.46 2.50 2.54 2.58 2.62 2.66 2.70
OUTPUT (V)
2.30 2.34 2.38 2.42 2.46 2.50 2.54 2.58 2.62 2.66 2.70
OUTPUT (V)
Figure 7. X-Axis Zero g Bias at 25°C, VS = 5 V
Figure 10. Y-Axis Zero g Bias at 25°C, VS = 5 V
Rev. 0 | Page 6 of 16
ADXL±2±
35
30
25
20
15
10
5
40
35
30
25
20
15
10
5
0
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
/°C)
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
/°C)
TEMPERATURE COEFFICIENT (m
g
TEMPERATURE COEFFICIENT (m
g
Figure 11. X-Axis Zero g Bias Temperature Coefficient, VS = 3 V
Figure 14. Y-Axis Zero g Bias Temperature Coefficient, VS = 3 V
35
40
35
30
25
20
15
10
5
30
25
20
15
10
5
0
0
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
/°C)
–2.5 –2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0 2.5
/°C)
TEMPERATURE COEFFICIENT (m
g
TEMPERATURE COEFFICIENT (m
g
Figure 12. X-Axis Zero g Bias Temperature Coefficient, VS = 5 V
Figure 15. Y-Axis Zero g Bias Temperature Coefficient, VS = 5 V
1.55
N = 8
1.54
1.55
N = 8
1.54
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.46
1.45
–30 –20 –10
0
10
20
30
40
50
60
70
80
–30 –20 –10
0
10
20
30
40
50
60
70
80
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 13. X-Axis Zero g Bias vs. Temperature;
Figure 16. Y-Axis Zero g Bias vs. Temperature;
Eight Parts Soldered to PCB, VS = 3 V
Eight Parts Soldered to PCB, VS = 3 V
Rev. 0 | Page 7 of 16
ADXL±2±
35
30
25
20
15
10
5
40
35
30
25
20
15
10
5
0
0
0.170 0.174 0.178 0.182 0.186 0.190 0.194 0.198 0.202 0.206 0.210
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 = 2 V
Figure 20. Y-Axis Sensitivity at 25°C, VS = 2 V
60
50
40
30
20
10
70
60
50
40
30
20
10
0
0
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.33
0.34
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.33
0.34
SENSITIVITY (V/
g)
SENSITIVITY (V/g)
Figure 18. X-Axis Sensitivity at 25°C, VS = 3 V
Figure 21. Y-Axis Sensitivity at 25°C, VS = 3 V
25
20
15
10
5
40
35
30
25
20
15
10
5
0
0
0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60
SENSITIVITY (V/
0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59 0.60
g)
SENSITIVITY (V/g)
Figure 19. X-Axis Sensitivity at 25°C, VS = 5 V
Figure 22. Y-Axis Sensitivity at 25°C, VS = 5 V
Rev. 0 | Page 8 of 16
ADXL±2±
90
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
DRIFT (%)
DRIFT (%)
Figure 23. X-Axis Sensitivity Drift Over Temperature, VS = 3 V
Figure 26. Y-Axis Sensitivity Drift Over Temperature, VS = 3 V
100
90
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
–2.0 –1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6 2.0
DRIFT (%)
DRIFT (%)
Figure 24. X-Axis Sensitivity Drift Over Temperature, VS = 5 V
Figure 27. Y-Axis Sensitivity Drift Over Temperature, VS = 5 V
0.33
N = 8
0.32
0.33
N = 8
0.32
0.31
0.30
0.29
0.28
0.27
0.31
0.30
0.29
0.28
0.27
–30 –20 –10
0
10
20
30
40
50
60
70
80
–30 –20 –10
0
10
20
30
40
50
60
70
80
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 25. X-Axis Sensitivity vs. Temperature
Eight Parts Soldered to PCB, VS = 3 V
Figure 28. Y-Axis Sensitivity vs. Temperature
Eight Parts Soldered to PCB, VS = 3 V
Rev. 0 | Page 9 of 16
ADXL±2±
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
T 9.400%
A CH1
300mV
1
2
3
4
5
6
SUPPLY (V)
Figure 29. Typical Current Consumption vs. Supply Voltage
Figure 30. Typical Turn-On Time; CX, CY = 0.0047 μF, VS = 3 V
Rev. 0 | Page 10 of 16
ADXL±2±
THEORY OF OPERATION
The ADXL323 is a complete 2-axis acceleration measurement
system on a single, monolithic IC. The ADXL323 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 ADXL323 uses a single structure for sensing the X-axis and
Y-axis. As a result, the sense directions of the two axes are
highly orthogonal with little cross axis sensitivity. Mechanical
misalignment of the sensor die to the package is the chief
source of cross axis sensitivity. Mechanical misalignment can, of
course, be calibrated out at the system level.
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques ensure that high
performance is built in to the ADXL323. 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 13 and Figure 16 show the zero g output performance of
eight parts (X-axis and Y-axis) soldered to a PCB over a −25°C
to +70°C temperature range.
Figure 25 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
ADXL±2±
APPLICATIONS
Never expose the ST pin to voltages greater than VS + 0.3 V.
If this cannot be guaranteed due to the system design (for
example, if there are multiple supply voltages), a low VF
clamping diode between ST and VS is recommended.
POWER SUPPLY DECOUPLING
For most applications, a single 0.1 μF capacitor, CDC, placed
close to the ADXL323 supply pins adequately decouples the
accelerometer from noise on the power supply. However, in
applications where noise is present at the 50 kHz internal clock
frequency (or any harmonic thereof), additional care in power
supply bypassing is required because this noise can cause errors
in acceleration measurement. If additional decoupling is needed,
a 100 Ω (or smaller) resistor or ferrite bead can be inserted in
the supply line. Additionally, a larger bulk bypass capacitor
(1 μF or greater) can be added in parallel to CDC. Ensure that the
connection from the ADXL323 ground to the power supply
ground is low impedance because noise transmitted through
ground has an effect similar to that of 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 and YOUT
.
The output of the ADXL323 has a typical bandwidth of greater
than 1600 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 ADXL323 has provisions for band limiting the XOUT pin
and the YOUT pin. 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 ADXL323 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)
)
F
The tolerance of the internal resistor (RFILT) typically varies as
much as 15ꢀ 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.
With the single-pole, roll-off characteristic, the typical noise of
the ADXL323 is determined by
rms Noise = Noise Density × ( BW ×1.6)
Table 5. Filter Capacitor Selection, CX, CY, and CZ
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.
Bandwidth (Hz)
Capacitor (μF)
1
4.7
10
ꢀ0
100
200
ꢀ00
0.47
0.10
0.0ꢀ
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
6 × rms
8 × rms
4.6
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, and 500 mg
(or 150 mV) on the Y-axis. This ST pin can be left open circuit
or connected to common (COM) in normal use.
USE WITH OPERATING VOLTAGES OTHER THAN 3 V
The ADXL323 is tested and specified at VS = 3 V; however, it
can be powered with VS as low as 1.8 V or as high as 5.25 V.
Note that some performance parameters change as the supply
voltage is varied.
Rev. 0 | Page 12 of 16
ADXL±2±
At VS = 1.8 V, the self-test response is approximately −40 mV
for the X-axis and +40 mV for the Y-axis.
The ADXL323 output is ratiometric; therefore, the output
sensitivity (or scale factor) varies proportionally to the supply
voltage. At VS = 5 V, the output sensitivity is typically 550 mV/g.
At VS = 2 V, the output sensitivity is typically 190 mV/g.
The supply current decreases as the supply voltage decreases.
Typical current consumption at VS = 5 V is 500 μA, and typical
current consumption at VS = 1.8 V is 180 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
Y
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 = 5 V, the noise
density is typically 180 μg/√Hz, while at VS = 1.8 V, the noise
density is typically 360 ꢁg/√Hz.
TOP
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 = 5 V, the self-test response for the ADXL323 is
approximately −700 mV for the X-axis and +700 mV for the Y-axis.
A
X
Figure 31. Axes of Acceleration Sensitivity, Corresponding Output Voltage
Increases When Accelerated Along the Sensitive Axis
X
Y
= –1g
= 0g
OUT
OUT
TOP
GRAVITY
X
Y
= 0g
= –1g
X
Y
= 0g
= 1g
OUT
OUT
OUT
OUT
TOP
TOP
TOP
X
Y
= 1g
= 0g
OUT
OUT
T
O
P
X
Y
= 0g
= 0g
X
Y
= 0g
= 0g
OUT
OUT
OUT
OUT
Figure 32. Output Response vs. Orientation to Gravity
Rev. 0 | Page 13 of 16
ADXL±2±
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
ADXL323KCPZ1
ADXL323KCPZ–RL1
EVAL-ADXL323Z1
3 g
3 g
3 V
3 V
−2ꢀ°C to +70°C
−2ꢀ°C to +70°C
16-Lead LFCSP_LQ
16-Lead LFCSP_LQ
Evaluation Board
CP-16-ꢀ
CP-16-ꢀ
1 Z = Pb-free part.
Rev. 0 | Page 14 of 16
ADXL±2±
NOTES
Rev. 0 | Page 1ꢀ of 16
ADXL±2±
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06237-0-8/06(0)
Rev. 0 | Page 16 of 16
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