ADXL105 a

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a
5 g Single Axis
i
MEM
S
®
Accelerometer with Analog Input
High Accuracy
6
1 g to
6
ADXL105*
FEATURES
Monolithic IC Chip
2 mg Resolution
10 kHz Bandwidth
Flat Amplitude Response (
6
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
FUNCTIONAL BLOCK DIAGRAM
V
DD
T
OUT
TEMP
SENSOR
ADXL105
UNCOMMITTED
AMPLIFIER
ST
X SENSOR
COM
COM
A
OUT
V
MID
V
NIN
V
IN
UCA
OUT
APPLICATIONS
Automotive
Accurate Tilt Sensing with Fast Response
Machine Health and Vibration Measurement
Affordable Inertial Sensing of Velocity and Position
Seismic Sensing
Rotational Acceleration
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
±
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/
°
Hz
allowing signals below
2m
g
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.
m
g
Ö
°
C to +70
°
C, and
–40
°
C to +85
C temperature ranges.
*Patent Pending.
i
MEM
S
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
5
g
and produces an analog voltage out-
put. Typical noise floor is 225
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
°
ADXL105–SPECIFICATIONS
(T
A
= T
MIN
to T
MAX
, T
A
= +25
8
C for J Grade Only, V
S
= +5 V, @ Acceleration = 0 g,
unless otherwise noted)
˚ ˚ ˚ ˚ ˚ ˚ ˚ ADXL105J/A
Parameter
Conditions
Min
Typ
Max
Units
SENSOR INPUT
Measurement Range
1
±
5
±
7
g
Nonlinearity
Best Fit Straight Line
0.2
% of FS
Alignment Error
2
±
1
Degrees
Cross Axis Sensitivity
3
Z Axis, @ +25
°
C
±
1
±
5
%
SENSITIVITY
4
(Ratiometric)
At A
OUT
Initial
225
250
275
mV/
g
V
S
= 2.7 V
80
105
120
mV/
g
vs. Temperature
5, 6
±
0.5
%
ZERO
g
BIAS LEVEL
5
(Ratiometric)
At A
OUT
Zero
g
Offset Error
From +2.5 V Nominal
–625
+625
mV
vs. Supply
–20
+20
mV/V
DD
/V
vs. Temperature
5, 7
50
mV
NOISE PERFORMANCE
Voltage Density
7
@ +25
°
C
225
325
m
g
/
Ö
Hz
Noise in 100 Hz Bandwidth
2.25
m
g
rms
FREQUENCY RESPONSE
3 dB Bandwidth
10
12
kHz
Sensor Resonant Frequency
13
18
kHz
TEMP SENSOR
4
(Ratiometric)
Output Error at +25°C
From +2.5 V Nominal
–100
+100
mV
Nominal Scale Factor
8
mV/°C
Output Impedance
10
kW
V
MID
4
(Ratiometric)
Output Error
From +2.5 V Nominal
–15
+15
mV
Output Impedance
10
k
W
SELF-TEST
(Proportional to V
DD
)
Voltage Delta at A
OUT
Self-Test “0” to “1”
100
500
mV
Input Impedance
8
30
50
kW
A
OUT
Output Drive
I = ± 50 mA
0.50
V
S
– 0.5
V
Capacitive Load Drive
1000
pF
UNCOMMITTED AMPLIFIER
Initial Offset
–25
+25
mV
Initial Offset vs. Temperature
5
m
V/
°
C
Common-Mode Range
1.0
4.0
V
Input Bias Current
9
25
nA
Open Loop Gain
100
V/mV
Output Drive
I =
±
100
m
A
0.25
V
S
– 0.25
V
Capacitive Load Drive
1000
pF
POWER SUPPLY
Operating Voltage Range
2.70
5.25
V
Quiescent Supply Current
At 5.0 V
1.9
2.6
mA
At 2.7 V
1.3
2.0
mA
Turn-On Time
700
ms
TEMPERATURE RANGE
Operating Range J
0
+70
°C
Specified Performance A
–40
+85
°
C
NOTES
1
Guaranteed by tests of zero
g
bias, sensitivity and output swing.
2
Alignment of the X axis is with respect to the long edge of the bottom half of the Cerpak package.
3
Cross axis sensitivity is measured with an applied acceleration in the Z axis of the device.
4
This parameter is ratiometric to the supply voltage V
DD
. Specification is shown with a 5.0 V V
DD
. To calculate approximate values at another V
DD
, multiply the specification by
V
DD
/5 V.
5
Specification refers to the maximum change in parameter from its initial value at +25°C to its worst case value at T
MIN
to T
MAX
.
6
See Figure 3.
7
See Figure 2.
8
CMOS and TTL Compatible.
9
UCA input bias current is tested at final test.
All min and max specifications are guaranteed. Typical specifications are not tested or guaranteed.
Specifications subject to change without notice.
–2–
REV. A
ADXL105
ABSOLUTE MAXIMUM RATINGS*
Acceleration (Any Axis, Unpowered for 0.5 ms) . . . . . .1000
g
Acceleration (Any Axis, Powered for 0.5 ms) . . . . . . . . . 500
g
+V
S
˚ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7.0 V
Output Short Circuit Duration
˚ ˚ (Any Pin to Common) . . . . . . . . . . . . . . . . . . . . Indefinite
Operating Temperature . . . . . . . . . . . . . . . . –55
Package Characteristics
Package
u
JA
u
JC
Device Weight
14-Lead Cerpak 110
°
C/W
30
°
C/W
<2 Grams
°
C to +125
C
ORDERING GUIDE
C
*
Stresses above those listed under Absolute Maximum Ratings may cause
perma-
nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
°
C to +150
°
Model
Temperature Range Package Option
ADXL105JQC
0°C to +70°C
QC-14
ADXL105AQC
–40°C to +85°C
QC-14
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADXL105 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
Drops onto hard surfaces can cause shocks of greater than 1000
g
and exceed the absolute maximum rating of the device. Care should
be exercised in handling to avoid damage.
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
Pin No. Name
Description
T
OUT
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
DD
1
T
OUT
Temperature Sensor Output
NC
NC
COM
NC
ST
COM
V
DD
2, 3, 5 NC
No Connect
ADXL105
UCA
OUT
V
IN
V
NIN
V
MID
A
OUT
4
COM
Common
TOP VIEW
(Not to Scale)
6
ST
Self-Test
7
COM
Common (Substrate)
8
A
OUT
Accelerometer Output
NC = NO CONNECT
9
V
MID
V
DD
/2 Reference Voltage
10
V
NIN
Uncommitted Amp Noninverting Input
11
V
IN
Uncommitted Amp Inverting Input
12
UCA
OUT
Uncommitted Amp Output
13, 14
V
DD
Power Supply Voltage
1
2
3
4
5
6
7
14
13
12
11
10
9
8
A
OUT
= 2.75V A
OUT
= 2.50V A
OUT
= 2.25V
Figure 1. ADXL105 Response Due to Gravity
REV. A
–3–
°
Storage Temperature . . . . . . . . . . . . . . . . . . –65
ADXL105
–Typical Performance Characteristics
120
25
90
20
60
30
15
0
–30
10
–60
5
–90
–120
0
0.242
–50
0
50
100
0.244
0.246 0.248 0.250 0.252 0.254
0.256
0.258
0.260
TEMPERATURE –
C
SENSITIVITY – V/g
Figure 2. Typical 0 g Shift vs. Temperature*
Figure 5. Sensitivity Distribution*
5
2.5
4
2
3
2
1.5
1
1
0
0.5
–1
–2
–50
0
50
100
0
2.7
3.3
4
5
5.5
TEMPERATURE –
C
SUPPLY VOLTAGE
Figure 3. Typical Sensitivity Shift vs. Temperature*
Figure 6. Typical Supply Current vs. Supply Voltage
20
18
18
16
12
14
–6
12
10
–0
8
6
–6
4
–12
2
0
–18
100
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
1000
10000
100000
OUTPUT – V
FREQUENCY – Hz
Figure 4. 0 g Output Distribution*
Figure 7. Noise Graph
*Data from several characterization lots.
–4–
REV. A
8
8
ADXL105
500
450
400
350
300
250
200
150
2
3
4
5
6
SUPPLY VOLTAGE
Figure 8. Typical Noise Density vs. Supply Voltage
Figure 11. Typical Self-Test Response at V
DD
= 5 V
40
15
35
10
ADXL105 SOLDERED TO PCB
30
5
25
20
0
15
–5
10
ADXL105 SOLDERED AND GLUED TO PCB
5
–10
0
–15
205
210
215
220
225 230
235
240
245
250
1
10
100
1000
10000
100000
NOISE DENSITY –
m
g/ Hz
FREQUENCY – Hz
Figure 9. Noise Distribution*
Figure 12. Frequency Response
20
400
18
300
ADXL105 SOLDERED TO PCB
16
14
200
12
100
10
8
0
6
–100
4
–200
2
ADXL105 SOLDERED AND GLUED TO PCB
0
–300
1
10
100
1000
10000
100000
FREQUENCY – Hz
DEGREES OF MISALIGNMENT
Figure 10. Rotational Die Alignment*
Figure 13. Phase Response
*Data from several characterization lots.
REV. A
–5–
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