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PDF ADXL1002 Data sheet ( Hoja de datos )
| Número de pieza | ADXL1002 | |
| Descripción | High Frequency MEMS Accelerometers | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Noise, High Frequency MEMS
Accelerometers
ADXL1001/ADXL1002
FEATURES
Single in plane axis accelerometer with analog output
Linear frequency response range from dc to 11 kHz (3 dB point)
Resonant frequency of 21 kHz
Ultralow noise density
30 µg/√Hz in ±100 g range (ADXL1001)
25 µg/√Hz in ±50 g range (ADXL1002)
Overrange sensing plus dc coupling allows fast recovery time
Complete electromechanical self-test
Sensitivity performance
Sensitivity stability over temperature 5%
Linearity to ±0.1% of full-scale range
Cross axis sensitivity ±1% (ZX), ±1% (YX),
Single-supply operation
Output voltage ratiometric to supply
Low power consumption 1.0 mA
Power saving standby operation mode with fast recovery
RoHS compliant
−40°C to +125°C temperature range
5 mm × 5 mm × 1.80 mm LFCSP package
APPLICATIONS
Condition monitoring
Predictive maintenance
Asset health
Test and measurement
Health usage monitoring system (HUMS)
GENERAL DESCRIPTION
The ADXL1001/ADXL1002 deliver ultralow noise density over
an extended frequency range with two full-scale range options,
and are optimized for industrial condition monitoring. The
ADXL1001 (±100 g) and the ADXL1002 (±50 g) have typical
noise densities of 30 µg/√Hz and 25 µg/√Hz, respectively. Both
accelerometer devices have stable and repeatable sensitivity,
which is immune to external shocks up to 10,000 g.
FUNCTIONAL BLOCK DIAGRAM
VDD STANDBY
TIMING
GENERATOR
ADXL1001/ADXL1002
MOD SENSOR
AMP
DEMOD
OUTPUT
AMPLIFIER
VOUT
SELF TEST
OVERRANGE
DETECTION
OR
ST VSS
Figure 1.
The ADXL1001/ADXL1002 have an integrated full electrostatic
self test (ST) function and an overrange (OR) indicator that
allow advanced system level features and are useful for
embedded applications. With low power and single-supply
operation of 3.3 V to 5.25 V, the ADXL1001/ADXL1002 also
enable wireless sensing product design. The ADXL1001/
ADXL1002 are available in a 5 mm × 5 mm × 1.80 mm LFCSP
package, and are rated for operation over a −40°C to +125°C
temperature range.
Rev. 0
Document Feedback
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
©2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NIC 1
NIC 2
NIC 3
NIC 4
NIC 5
NIC 6
NIC 7
NIC 8
+–
AXIS OF SENSITIVITY
ADXL1001/
ADXL1002
TOP VIEW
(Not to Scale)
24 DNC
23 DNC
22 DNC
21 DNC
20 OR
19 DNC
18 DNC
17 DNC
ADXL1001/ADXL1002
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
2. DNC = NO NOT CONNECT. LEAVE THIS PIN UNCONNECTED.
3. THE EXPOSED PAD ON THE BOTTOM OF THE PACKAGE MUST BE CONNECTED TO GROUND.
4. AXIS OF SENSITIVITY IS IN-PLANE TO THE PACKAGE AND HORIZONTAL AS SHOWN.
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
1 to 9, 31, 32
NIC
10, 11, 17 to 19, 21 to
26, 29
DNC
12
13, 14, 27, 28
15
VDD
VSS
STANDBY
16 ST
20 OR
30 VOUT
33 EPAD
Description
Not Internally Connected.
Do Not Connect. Leave unconnected.
3.3 V to 5.25 V Supply Voltage.
Supply Ground.
Standby mode Input, Active High.
Self Test Input, Active High.
Overrange Output. This pin instantaneously indicates when the overrange detection circuit
identifies significant overrange activity. This pin is not latched.
Analog Output Voltage.
Exposed Pad. The exposed pad on the bottom of the package must be connected to ground.
Rev. 0 | Page 5 of 14
5 Page 
Data Sheet
ADXL1001/ADXL1002
45
40
35
30
25
20
3.3 3.8 4.3 4.8
SUPPLY VOLTAGE (V)
Figure 24. ADXL1002 Sensitivity vs. Supply Voltage
5.3
INTERFACING ANALOG OUTPUT BELOW 10 kHz
The ADXL1001/ADXL1002 sense mechanical motion along a
single axis and produces a voltage output. The system
performance depends on the output response that is a result of
mechanical vibration sensed and signal processing of the
electrical output.
The sensor must be effectively mechanically coupled. Mechanical
coupling can be a complex integration of multiple components,
typically unique for each application. Consideration must be
made for all mechanical interfaces including the mounting of
the MEMS to the PCB (location on the PCB as well as solder
chemistry), the size of the PCB (both thickness and active
surface area), and the mounting of the PCB to the system being
monitored (either in a module or directly mounted).
In general, the following guidelines for effective mechanical
interface must be used to support up to 10 kHz bandwidth:
• Keep the ADXL1001/ADXL1002 near a stable mechanical
mounting on the PCB.
• Provide multiple hard mounting points.
• Keep the PCB thick and avoid a large surface area PCB that
induces higher magnitude and lower frequency resonances.
• Ensure the mechanical connection is sufficiently stiff to
transfer mechanical forces up to the desired frequency.
Below 10 kHz, magnetic and adhesive mounting is possible
with proper attention. The EVAL-ADXL1001Z and the
EVAL-ADXL1002Z evaluation boards can be used as a
reference.
The ADXL1001/ADXL1002 electrical output supports a bandwidth
beyond the resonance of the sensor. The small signal bandwidth of
the output amplifier in the ADXL1001/ADXL1002 is 70 kHz.
During the digitization process, aliasing, which is the folding of
higher frequency noise and signals into the desired band, can
occur. To avoid aliasing noise from the amplifier and other
internal circuits (for example, coupling of the internal 200 kHz
clock), it is recommended that an external filter be implemented at
the desired bandwidth and the chosen ADC sampling rate be
faster than the amplifier bandwidth.
The output amplifier is ratiometric to the supply voltage, and
there are two distinct cases regarding digital conversion, as
follows:
• The user has an analog-to-digital (ADC) downstream of
the accelerometer that can use the VDD voltage as a
reference. In this case, the voltage supply tolerance and
voltage temperature coefficient (commonly associated with
external regulators) tracks between the sensor and the
ADC and, therefore, the supply and reference voltage
induced error cancels out. This design approach is
recommended.
• If the ADC cannot reference the same 5 V supply as the
sensor for any reason, the sensitivity of the digitized sensor
output reflects the regulator tolerance and temperature
coefficient.
The ADXL1001/ADXL1002 output amplifier is stable while
driving capacitive loads up to 100 pF directly without a series
resistor. At loads greater than 100 pF, an 8 kΩ series resistor or
greater must be used.
See Figure 25 for an example of the interface including compo-
nents when measuring mechanical vibration from 0 kHz to
5 kHz, using the AD4000 ADC. For a 5 kHz pass band, a single-
pole RC filter is acceptable; however, in some applications, use a
more aggressive filter and lower sample rate. The following
components are recommended to form a two-pole RC filter at
the output of the ADXL1001/ADXL1002: R1 = 91 kΩ, C1 =
330 pF, R2 = 0 Ω, and C2 = not required. A minimum ADC
sample rate of 16 kHz is recommended to avoid aliasing.
See Figure 25 for an example of the interface including compo-
nents when measuring mechanical vibration from 0 kHz to
10 kHz. The following components are recommended to form a
two-pole RC filter at the output of the ADXL1001/ADXL1002:
R1 = 16 kΩ, C1 = 300 pF, R2 = 32 kΩ, and C2 = 300 pF. A
minimum ADC sample rate of 32 kHz is recommended to avoid
aliasing. The two-pole RC filter produces an attenuation of
approximately 84 dB at 200 kHz, the internal clock frequency.
VDD
3.3V TO 5.0V1
AD4000 VDD
1.8V
0.1µF
(+1µF, OPTIONAL)
VDD
VOUT
ADXL1001/
ADXL1002
VSS
R1
C1
10µF
R2
C2
IN+ REF VDD
AD4000
IN–
GND
13.3V LIMITED BY ADXL1001/ADXL1002; 5.0V LIMITED BY AD4000
Figure 25. Application Circuit for the ADXL1001/ADXL1002
Rev. 0 | Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ADXL1002.PDF ] | |
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