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ADXL50 데이터시트 PDF




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부품번호 ADXL50 기능
기능 Monolithic Accelerometer With Signal Conditioning
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ADXL50 데이터시트, 핀배열, 회로
a
Monolithic Accelerometer
With Signal Conditioning
ADXL50*
FEATURES
Complete Acceleration Measurement System
on a Single Monolithic IC
Full-Scale Measurement Range: ؎50 g
Self-Test on Digital Command
+5 V Single Supply Operation
Sensitivity Precalibrated to 19 mV/g
Internal Buffer Amplifier for User Adjustable Sensitivity
and Zero-g Level
Frequency Response: DC to 10 kHz
Post Filtering with External Passive Components
High Shock Survival: >2000 g Unpowered
Other Versions Available: ADXL05 (؎5 g)
GENERAL DESCRIPTION
The ADXL50 is a complete acceleration measurement system on
a single monolithic IC. Three external capacitors and a +5 volt
power supply are all that is required to measure accelerations up
to ± 50 g. Device sensitivity is factory trimmed to 19 mV/g,
resulting in a full-scale output swing of ± 0.95 volts for a ± 50 g
applied acceleration. Its zero g output level is +1.8 volts.
A TTL compatible self-test function can electrostatically deflect
the sensor beam at any time to verify device functionality.
For convenience, the ADXL50 has an internal buffer amplifier
with a full 0.25 V to 4.75 V output range. This may be used to
set the zero-g level and change the output sensitivity by using
external resistors. External capacitors may be added to the resis-
tor network to provide 1 or 2 poles of filtering. No external
active components are required to interface directly to most
analog-to-digital converters (ADCs) or microcontrollers.
The ADXL50 uses a capacitive measurement method. The ana-
log output voltage is directly proportional to acceleration, and is
fully scaled, referenced and temperature compensated, resulting
in high accuracy and linearity over a wide temperature range.
Internal circuitry implements a forced-balance control loop that
improves accuracy by compensating for any mechanical sensor
variations.
The ADXL50 is powered from a standard +5 V supply and is
robust for use in harsh industrial and automotive environments
and will survive shocks of more than 2000 g unpowered.
The ADXL50 is available in a hermetic 10-pin TO-100 metal
can, specified over the 0°C to +70°C commercial, and –40°C to
+85°C industrial temperature ranges. Contact factory for avail-
ability of devices specified for operation over the –40°C to
+105°C automotive temperature range.
FUNCTIONAL BLOCK DIAGRAM
ADXL50
REFERENCE
+3.4V
6
VREF
OUTPUT
OSCILLATOR
DECOUPLING
CAPACITOR
4
C2
OSCILLATOR
SENSOR
SELF TEST
(ST)
7
5
COM
1
C3
+5V
+1.8V
DEMODULATOR
PREAMP
BUFFER
AMP
2
C1
3
C1
DEMODULATOR
CAPACITOR
8 10
VPR R1
VIN– R3
R2
9
VOUT
*Patents pending.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703




ADXL50 pdf, 반도체, 판매, 대치품
ADXL50
+1g
TAB
PIN 5
Figure 1. Output Polarity at VPR
SIDE VIEW
Z
TRANSVERSE Z AXIS
X
PIN 5
X
TAB SENSITIVE (X) AXIS
Z
Figure 2a. Sensitive X and Transverse Z Axis
TOP VIEW
Y
TRANSVERSE Y AXIS
X
PIN 5
X
TAB SENSITIVE (X) AXIS
Y
Figure 2b. Sensitive X and Transverse Y Axis
–Z Axis
Axyz
θxy
θx
Ax
X Axis
Y Axis
Axy
Figure 2c. A Vector Analysis of an Acceleration Acting
Upon the ADXL50 in Three Dimensions
Polarity of the Acceleration Output
The polarity of the ADXL50 output is shown in the Figure 1.
When oriented to the earth’s gravity (and held in place), the
ADXL50 will experience an acceleration of +1 g. This corre-
sponds to a change of approximately +19 mV at the VPR output
pin. Note that the polarity will be reversed to a negative going
signal at the buffer amplifier output VOUT, due to its inverting
configuration.
Mounting Considerations
There are three main causes of measurement error when using
accelerometers. The first two are alignment and transverse sen-
sitivity errors. The third source of error is due to resonances or
vibrations of the sensor in its mounting fixture.
Errors Due to Misalignment
The ADXL50 is a sensor designed to measure accelerations that
result from an applied force. Because these forces act on the
sensor in a vector manner, the alignment of the sensor to the
force to be measured may be critical.
The ADXL50 responds to the component of acceleration on its
sensitive X axis. Figures 2a and 2b show the relationship be-
tween the sensitive “X” axis and the transverse “Z” and “Y”
axes as they relate to the TO-100 package.
Figure 2c describes a three dimensional acceleration vector
(AXYZ) which might act on the sensor, where AX is the compo-
nent of interest. To determine AX, first, the component of accel-
eration in the XY plane (AXY) is found using the cosine law:
AXY = AXYZ (cosθXY) then
AX = AXY (cosθX)
Therefore: Typical VPR = 19 mV/g (AXYZ) (cosθXY) cosθX
Note that an ideal sensor will react to forces along or at angles
to its sensitive axis but will reject signals from its various trans-
verse axes, i.e., those exactly 90° from the sensitive “X” axis.
But even an ideal sensor will produce output signals if the trans-
verse signals are not exactly 90° to the sensitive axis. An accel-
eration that is acting on the sensor from a direction different
from the sensitive axis will show up at the ADXL50 output at a
reduced amplitude.
Table I. Ideal Output Signals for Off Axis Applied
Accelerations Disregarding Device Alignment and
Transverse Sensitivity Errors
% of Signal Appearing Output in gs for a 50 g
θX at Output
Applied Acceleration
0 100%
1° 99 98%
2° 99.94%
3° 99.86%
5° 99.62%
10° 98.48%
30° 86.60%
45° 70.71%
60° 50.00%
80° 17.36%
85° 8.72%
87° 5.25%
88° 3.49%
89° 1.7%
90° 0%
50 (On Axis)
49.99
49.97
49.93
49.81
49.24
43.30
35.36
25.00
8.68
4.36
2.63
1.75
0.85
0.00 (Transverse Axis)
–4– REV. B

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ADXL50 전자부품, 판매, 대치품
+0.50
+0.25
TA = +25°C
C1 = C2 = 0.022µF
0
–0.25
–0.50
4.8
4.9 5.0 5.1
SUPPLY VOLTAGE – V
5.2
5.3
Figure 10. Change in Sensitivity vs. Supply Voltage
55
TA = +25°C
VS = +5V + (0.5Vp-p)
C1 = C2 = 0.022µF
45
ADXL50
0.5
0.0
–0.5
–1.0
–1.5
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE – °C
Figure 13. Percent Change in Sensitivity at VPR vs.
Temperature
80
TA = +25°C
VS = +5V + (0.5Vp-p)
60
35 40
25
1
10 100 1k 10k 100k
FREQUENCY – Hz
Figure 11. VPR 0 g PSRR vs. Frequency
40
30
20
10
0
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE – °C
Figure 12. 0 g Bias Level vs. Temperature
20
1
10 100 1k 10k 100k
FREQUENCY – Hz
Figure 14. +3.4 V REF PSRR vs. Frequency
3.404
3.400
VREF
–1004
3.396
3.392
SELF–TEST
–1000
–0.996
3.388
–0.992
3.384
–60 –40 –20
0 20 40 60 80
TEMPERATURE – °C
–0.988
100 120 140
Figure 15. VREF Output and Change in Self-Test Output
Swing vs. Temperature
REV. B
–7–

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