Analog Devices ADXL105 a Datasheet

High Accuracy ⴞ1 g to ⴞ5 g Single Axis

a

FEATURES
Monolithic IC Chip
2 m

g

Resolution
10 kHz Bandwidth
Flat Amplitude Response (ⴞ1%) to 5 kHz
Low Bias and Sensitivity Drift
Low Power 2 mA
Output Ratiometric to Supply
User Scalable
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

g

Range

MEM

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®

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Accelerometer with Analog Input

ADXL105*

FUNCTIONAL BLOCK DIAGRAM

V

DD

T

OUT

ST

TEMP

SENSOR

X SENSOR

COM A

COM

ADXL105

OUTVMID

UNCOMMITTED

V

V

NIN

AMPLIFIER

IN

UCA

OUT

GENERAL DESCRIPTION

The ADXL105 is a high performance, high accuracy and com­plete single-axis acceleration measurement system on a single
monolithic IC. The ADXL105 offers significantly increased
bandwidth and reduced noise versus previously available micro­machined devices. The ADXL105 measures acceleration with a

full-scale range up to ±5 g and produces an analog voltage out­put. Typical noise floor is 225 µg√Hz allowing signals below

2mg to be resolved. A 10 kHz wide frequency response enables
vibration measurement applications. The product exhibits signifi­cant reduction in offset and sensitivity drift over temperature
compared to the ADXL05.

*Patent Pending.

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MEM

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is a registered trademark of Analog Devices, Inc.

The ADXL105 can measure both dynamic accelerations, (typi­cal 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.

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: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1999

ADXL105–SPECIFICATIONS

(TA = T
unless otherwise noted)

MIN

to T

, TA = +25ⴗC for J Grade Only, VS = +5 V, @ Acceleration = 0 g,

MAX

␣␣␣␣␣␣␣ ADXL105J/A

Parameter Conditions Min Typ Max Units

SENSOR INPUT

Measurement Range
Nonlinearity Best Fit Straight Line 0.2 % of FS
Alignment Error
Cross Axis Sensitivity

SENSITIVITY4 (Ratiometric) At A

1

2

3

Z Axis, @ +25°C ±1 ±5%

OUT

±5 ±7 g

±1 Degrees

Initial 225 250 275 mV/g

vs. Temperature

5, 6

ZERO g BIAS LEVEL5 (Ratiometric) At A

VS = 2.7 V 80 105 120 mV/g

±0.5 %

OUT

Zero g Offset Error From +2.5 V Nominal –625 +625 mV
vs. Supply –20 +20 mV/VDD/V
vs. Temperature

NOISE PERFORMANCE

Voltage Density

5, 7

7

@ +25°C 225 325 µg/√Hz

50 mV

Noise in 100 Hz Bandwidth 2.25 mg rms

FREQUENCY RESPONSE

3 dB Bandwidth 10 12 kHz
Sensor Resonant Frequency 13 18 kHz

TEMP SENSOR4 (Ratiometric)

Output Error at +25°C From +2.5 V Nominal –100 +100 mV
Nominal Scale Factor 8 mV/°C
Output Impedance 10 kΩ

4

V

(Ratiometric)

MID

Output Error From +2.5 V Nominal –15 +15 mV

Output Impedance 10 kΩ

SELF-TEST (Proportional to VDD)

Voltage Delta at A
Input Impedance

A

OUT

8

OUT

Output Drive I = ±50 µA 0.50 V

Self-Test “0” to “1” 100 500 mV

30 50 kΩ

– 0.5 V

S

Capacitive Load Drive 1000 pF

UNCOMMITTED AMPLIFIER

Initial Offset –25 +25 mV

Initial Offset vs. Temperature 5 µV/°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 µA 0.25 V

– 0.25 V

S

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 µs

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 VDD. Specification is shown with a 5.0 V VDD. To calculate approximate values at another VDD, multiply the specification by

/5 V.

V

DD

5

Specification refers to the maximum change in parameter from its initial value at +25°C to its worst case value at T

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.

MIN

to T

MAX

.

–2–

REV. A

ADXL105

WARNING!

ESD SENSITIVE DEVICE

14

13

12

11

10

9

8

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1

2

3

4

5

6

7

A

OUT

= 2.75V A

OUT

= 2.50V A

OUT

= 2.25V

TOP VIEW

(Not to Scale)

14

13

12

11

10

9

8

1

2

3

4

5

6

7

NC = NO CONNECT

NC
NC

COM

NC

ST

COM

V

DD

UCA

OUT

V

IN

V

NIN

V

MID

A

OUT

T

OUT

ADXL105

V

DD

ABSOLUTE MAXIMUM RATINGS*

Acceleration (Any Axis, Unpowered for 0.5 ms) . . . . . .1000 g

Acceleration (Any Axis, Powered for 0.5 ms) . . . . . . . . .500 g

␣ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7.0 V

+V

S

Package Characteristics

Package ␪

JA

14-Lead Cerpak 110°C/W 30°C/W <2 Grams

Output Short Circuit Duration

␣ ␣ (Any Pin to Common) . . . . . . . . . . . . . . . . . . . . Indefinite

Operating Temperature . . . . . . . . . . . . . . . . –55°C to +125°C

Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°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.

Model Temperature Range Package Option

ADXL105JQC 0°C to +70°C QC-14
ADXL105AQC –40°C to +85°C QC-14

ORDERING GUIDE

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.

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.

␪

JC

Device Weight

PIN FUNCTION DESCRIPTIONS

Pin No. Name Description

1T

OUT

Temperature Sensor Output
2, 3, 5 NC No Connect
4 COM Common
6 ST Self-Test
7 COM Common (Substrate)
8A
9V
10 V
11 V
12 UCA
13, 14 V

OUT

MID

NIN

IN

OUT

DD

Accelerometer Output

VDD/2 Reference Voltage

Uncommitted Amp Noninverting Input

Uncommitted Amp Inverting Input

Uncommitted Amp Output

Power Supply Voltage

PIN CONFIGURATION

Figure 1. ADXL105 Response Due to Gravity

REV. A

–3–