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ADXL105 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADXL105은 전자 산업 및 응용 분야에서
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부품번호 ADXL105 기능
기능 High Accuracy 61 g to 65 g Single Axis iMEMS Accelerometer with Analog Input
제조업체 Analog Devices
로고 Analog Devices 로고


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ADXL105 데이터시트, 핀배열, 회로
a High Accuracy ؎1 g to ؎5 g Single Axis
iMEMS® Accelerometer with Analog Input
ADXL105*
FEATURES
Monolithic IC Chip
2 mg Resolution
10 kHz Bandwidth
Flat Amplitude Response (؎1%) to 5 kHz
Low Bias and Sensitivity Drift
Low Power 2 mA
Output Ratiometric to Supply
User Scalable g Range
On-Board Temperature Sensor
Uncommitted Amplifier
Surface Mount Package
+2.7 V to +5.25 V Single Supply Operation
1000 g Shock Survival
APPLICATIONS
Automotive
Accurate Tilt Sensing with Fast Response
Machine Health and Vibration Measurement
Affordable Inertial Sensing of Velocity and Position
Seismic Sensing
Rotational Acceleration
FUNCTIONAL BLOCK DIAGRAM
VDD
TOUT
ST
TEMP
SENSOR
ADXL105
UNCOMMITTED
AMPLIFIER
X SENSOR
COM
COM AOUT VMID VNIN VIN
UCAOUT
GENERAL DESCRIPTION
The ADXL105 is a high performance, high accuracy and com-
plete single-axis acceleration measurement system on a single
monolithic IC. The ADXL105 offers significantly increased
bandwidth and reduced noise versus previously available micro-
machined devices. The ADXL105 measures acceleration with a
full-scale range up to ± 5 g and produces an analog voltage out-
put. Typical noise floor is 225 µgHz allowing signals below
2 mg to be resolved. A 10 kHz wide frequency response enables
vibration measurement applications. The product exhibits signifi-
cant reduction in offset and sensitivity drift over temperature
compared to the ADXL05.
The ADXL105 can measure both dynamic accelerations, (typi-
cal of vibration) or static accelerations (such as inertial force,
gravity or tilt).
Output scale factors from 250 mV/g to 1.5 V/g are set using the
on-board uncommitted amplifier and external resistors. The
device features an on-board temperature sensor with an output
of 8 mV/°C for optional temperature compensation of offset vs.
temperature for high accuracy application.
The ADXL105 is available in a hermetic 14-lead surface mount
Cerpak with versions specified for the 0°C to +70°C, and
–40°C to +85°C temperature ranges.
*Patent Pending.
iMEMS is a registered trademark of Analog Devices, Inc.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999




ADXL105 pdf, 반도체, 판매, 대치품
ADXL105–Typical Performance Characteristics
120
90
60
30
0
–30
–60
–90
–120
–50
0 50
TEMPERATURE – ؇C
100
Figure 2. Typical 0 g Shift vs. Temperature*
25
20
15
10
5
0
0.242 0.244 0.246 0.248 0.250 0.252 0.254 0.256 0.258 0.260
SENSITIVITY – V/g
Figure 5. Sensitivity Distribution*
5
4
3
2
1
0
–1
–2
–50
0 50
TEMPERATURE – ؇C
100
Figure 3. Typical Sensitivity Shift vs. Temperature*
2.5
2
1.5
1
0.5
0
2.7
3.3 4
5
SUPPLY VOLTAGE
5.5
Figure 6. Typical Supply Current vs. Supply Voltage
20
18
16
14
12
10
8
6
4
2
0
2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8
OUTPUT – V
Figure 4. 0 g Output Distribution*
18
12
–6
–0
–6
–12
–18
100
1000
10000
FREQUENCY – Hz
Figure 7. Noise Graph
100000
*Data from several characterization lots.
–4– REV. A

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ADXL105 전자부품, 판매, 대치품
ADXL105
Output Scaling
The acceleration output (AOUT) of the ADXL105 is nominally
250 mV/g. This scale factor may not be appropriate for all appli-
cations. The UCA may be used to increase the scale factor. The
simplest implementation would be as shown in Figure 14a.
Since the 0 g offset of the ADXL105 is 2.5 V ± 625 mV, using a
gain of greater than 4 could result in having the UCA output at
0 V or 5 V at 0 g. The solution is to add R3 and VR1, as shown
in Figure 14b, turning the UCA into a summing amplifier. VR1
is adjusted such that the UCA output is VDD/2 at 0 g.
R2
IN
VMID
C
R1
OUT
f–3dB
=
1
2CR1
GAIN = – R1
R2
a. 1-Pole Low-Pass Filter
0.22F
20k20k
IN
0.18F
VMID
OUT
f–3dB = 30Hz
b. 2-Pole Bessel Low-Pass Filter
C R2
IN
R3
VMID
VMID
R1
OUT
f–3dB
=
1
2CR2
GAIN = –
R1
R2
R3 ~~ 2.5 R1
c. 1-Pole High-Pass Filter
So given a bandwidth of 1000 Hz, the typical rms noise floor of
an ADLX105 will be:
Noise = (225 µg/Hz) × (1000 × 1.6)
= 9 mg rms for a single-pole filter
and
Noise = (225 µg/Hz) × (1000 × 1.4)
= 8.4 mg rms for 2-pole filter
Often the peak value of the noise is desired. Peak-to-peak noise
can only be estimated by statistical means. Table I may be used
for estimating the probabilities of exceeding various peak values
given the rms value. The peak-to-peak noise value will give the
best estimate of the uncertainty in a single measurement.
Table I. Estimation of Peak-to-Peak Noise
Nominal Peak-to-
Peak Value
2 × rms
3 × rms
4 × rms
5 × rms
6 × rms
7 × rms
8 × rms
% of Time that Noise Will
Exceed Peak-to-Peak Value
32%
13%
4.6%
1.2%
0.27%
0.047%
0.0063%
The UCA may be configured to act as an active filter with gain
and 0 g offset control as shown in Figure 16.
0.1F
VDD
10k
47k
100k
44.2k
0.39F 0.39F
IN
59k
VMID
OUT
f–3dB = 10Hz
d. 2-Pole Bessel High-Pass Filter
Figure 15. UCA Used as Active Filters*
Device Bandwidth vs. Resolution
In general the bandwidth selected will determine the noise floor
and hence, the measurement resolution (smallest detectable
acceleration) of the ADXL105. Since the noise of the ADXL105
has the characteristic of white Gaussian noise that contributes
equally at all frequencies, the noise amplitude may be reduced
by simply reducing the bandwidth. So the typical noise of the
ADXL105 is:
Noise (rms) = (225 µg/Hz) × (√Bandwidth × K)
Where
K 1.6 for a single-pole filter
K 1.4 for a 2-pole filter
IN
47k47k
0.1F
OUT
GAIN = 2
f–3dB = 30Hz
Figure 16. UCA Configured as an Active Low-Pass Filter
with Gain and Offset
EMC and Electrical Noise
The design of the ADXL105 is such that EMI or magnetic
fields do not normally affect it. Since the ADXL105 is ratiomet-
ric, conducted electrical noise on VDD does affect the output.
This is particularly true for noise at the ADXL105’s internal
clock frequency (200 kHz) and its odd harmonics. So maintain-
ing a clean supply voltage is key in preserving the low noise and
high resolution properties of the ADXL105.
One way to ensure that VDD contains no high frequency noise is
to add an R-C low-pass filter near the VDD pin as shown in
Figure 17. Using the component values shown in Figure 17,
noise at 200 kHz is attenuated by approximately –23 dB. As-
suming the ADXL105 consumes 2 mA, there will be a 100 mV
drop across R1. This can be neglected simply by using the
ADXL105’s VDD as the A-to-D converter’s reference voltage as
shown in Figure 17.
*For other corner frequencies, consult an active filter handbook.
REV. A
–7–

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