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PDF ADXL316 Data sheet ( Hoja de datos )
| Número de pieza | ADXL316 | |
| Descripción | Accelerometer | |
| Fabricantes | Analog Devices | |
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Data Sheet
Small, Low Power,
3-Axis ±16 g Accelerometer
ADXL316
FEATURES
3-axis sensing with ±16 g minimum measurement range
Small, low profile package
12-lead, 4 mm × 4 mm × 1.45 mm LFCSP
Low quiescent supply current: 350 µA typical
Single-supply operation: 1.8 V to 3.6 V
10,000 g shock survival
Excellent temperature stability
Bandwidth (BW) adjustment with a single capacitor per axis
RoHS/WEEE lead-free compliant
−40°C to +105°C operating temperature range
Qualified for automotive applications
APPLICATIONS
Cost-sensitive, low power, motion and tilt sensing
applications
Mobile devices
Gaming systems
Disk drive protection
Image stabilization
Active noise control (ANC)
Sports and health devices
GENERAL DESCRIPTION
The ADXL316 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 measurement range of ±16 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 the x and y axes, and a range
of 0.5 Hz to 550 Hz for the z axis.
The ADXL316 is available in a small, low profile, 4 mm × 4 mm ×
1.45 mm, 12-lead, plastic lead frame chip scale package (LFCSP).
FUNCTIONAL BLOCK DIAGRAM
3V
CDC
VS
ADXL316
3-AXIS
SENSOR
AC
AMP
COM
ST
DEMOD
RFILT
OUTPUT AMP
RFILT
OUTPUT AMP
RFILT
OUTPUT AMP
XOUT
CX
YOUT
CY
ZOUT
CZ
Figure 1.
Rev. 0
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADXL316
TOP VIEW
(Not to Scale)
ADXL316
DNC 1
ST 2
COM 3
+Y
+Z
+X
9 XOUT
8 YOUT
7 DNC
NOTES
1. DNC = DO NOT CONNECT. DO NOT
CONNECT TO THIS PIN.
2. THE EXPOSED PAD IS NOT INTERNALLY
CONNECTED. SOLDER FOR
MECHANICAL INTEGRITY.
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 DNC
Do Not Connect.
2 ST
Self Test.
3 COM
Ground.
4 DNC
Do Not Connect.
5 DNC
Do Not Connect.
6 ZOUT
7 DNC
Z Channel Output.
Do Not Connect.
8 YOUT
9 XOUT
10 DNC
Y Channel Output.
X Channel Output.
Do Not Connect.
11 DNC
Do Not Connect.
12 VS
EP
Supply Voltage (1.8 V to 3.6 V).
Exposed Pad. The exposed pad is not internally connected. Solder for mechanical integrity.
Rev. 0 | Page 5 of 14
5 Page 
Data Sheet
APPLICATIONS INFORMATION
POWER SUPPLY DECOUPLING
For most applications, a single 0.1 µF capacitor, CDC, placed
close to the ADXL316 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 a 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 ADXL316 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 ADXL316 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) can vary by 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 4. 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
ADXL316
SELF TEST
The ST pin controls the self test feature. When this pin is connected
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
−0.88 g (corresponding to −50 mV) on the x-axis, 0.88 g (or
+50 mV) on the y-axis, and 1.58 g (or +90 mV) on the z-axis.
The ST pin may be left open circuit or connected to the common
pin (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), 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 (the smallest detectable acceleration).
Filtering can 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 ADXL316 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 decrease further to reduce
noise and improve resolution.
The ADXL316 has 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). 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 rms noise
of the ADXL316 is determined by
RMS Noise = Noise Density × ( BW ×1.6 )
Often, the peak value of the noise is desired. Statistical methods
can only estimate peak-to-peak noise. Table 5 is useful for
estimating the probabilities of exceeding various peak values,
given the rms value.
Table 5. 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
Rev. 0 | Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ADXL316.PDF ] | |
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