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ADXL330 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADXL330
Beschreibung Accelerometer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADXL330 Datasheet, Funktion
FEATURES
3-axis sensing
Small, low-profile package
4 mm × 4 mm × 1.45 mm LFCSP
Low power
180 μA at VS = 1.8 V (typical)
Single-supply operation
www.DataSheet4U1.c8oVmto 3.6 V
10,000 g shock survival
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
Mobile devices
Gaming systems
Disk drive protection
Image stabilization
Sports and health devices
Small, Low Power, 3-Axis ±3 g
i MEMS® Accelerometer
ADXL330
GENERAL DESCRIPTION
The ADXL330 is a small, thin, low power, complete 3-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.
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 1600 Hz for X and Y axes, and a range of
0.5 Hz to 550 Hz for the Z axis.
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).
FUNCTIONAL BLOCK DIAGRAM
+3V
CDC
VS
ADXL330
3-AXIS
SENSOR
AC AMP
COM
ST
DEMOD
OUTPUT AMP
RFILT
XOUT
CX
OUTPUT AMP
RFILT
YOUT
CY
OUTPUT AMP
RFILT
ZOUT
CZ
Figure 1.
Rev. A
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2007 Analog Devices, Inc. All rights reserved.






ADXL330 Datasheet, Funktion
ADXL330
TYPICAL PERFORMANCE CHARACTERISTICS
N > 1000 for all typical performance plots, unless otherwise noted.
35
30
25
20
15
www.DataSheet4U1.0com
5
0
1.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56
OUTPUT (V)
Figure 5. X-Axis Zero g Bias at 25°C, VS = 3 V
1.58
40
35
30
25
20
15
10
5
0
1.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56
OUTPUT (V)
Figure 6. Y-Axis Zero g Bias at 25°C, VS = 3 V
1.58
40
35
30
25
20
15
10
5
0
1.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56
OUTPUT (V)
Figure 7. Z-Axis Zero g Bias at 25°C, VS = 3 V
1.58
16
14
12
10
8
6
4
2
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
OUTPUT (V)
Figure 8. X-Axis Zero g Bias at 25°C, VS = 2 V
16
14
12
10
8
6
4
2
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
OUTPUT (V)
Figure 9. Y-Axis Zero g Bias at 25°C, VS = 2 V
25
20
15
10
5
0
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)
Figure 10. Z-Axis Zero g Bias at 25°C, VS = 2 V
Rev. A | Page 6 of 16

6 Page









ADXL330 pdf, datenblatt
ADXL330
APPLICATIONS
POWER SUPPLY DECOUPLING
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
www.Data(S1hμeFet4oUr .gcroemater) 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.
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
F−3 dB = 1/(2π(32 kΩ) × C(X, Y, Z))
or more simply
F–3 dB = 5 μF/C(X, Y, Z)
The tolerance of the internal resistor (RFILT) typically varies as
much as ±15% of its nominal value (32 kΩ), and the bandwidth
varies accordingly. A minimum capacitance of 0.0047 μF for CX,
CY, and CZ is recommended in all cases.
Table 5. Filter Capacitor Selection, CX, CY, and CZ
Bandwidth (Hz)
Capacitor (μF)
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
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.
Never expose the ST pin to voltages greater than VS + 0.3 V. If
this cannot be guaranteed due to the system design (for
instance, if there are multiple supply voltages), then a low VF
clamping diode between ST and VS is recommended.
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.
The ADXL330 noise has the characteristics of white Gaussian
noise, which contributes equally at all frequencies and is
described in terms of μg/√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.
With the single-pole, roll-off characteristic, the typical noise of
the ADXL330 is determined by
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 6. 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
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 1.8 V or as high as 3.6 V. Note
that some performance parameters change as the supply voltage
is varied.
Rev. A | Page 12 of 16

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