Analog Devices ADXL190 Datasheet

Low Cost ⴞ100 gSingle Axis

SELF-TEST

+V

S

2

25kV

5kV

ADXL190

GAIN

AMP

ZERO g ADJUST

COM

0.1mF

BUFFER

AMP

DEMODULATOR

SENSOR

+V

S

TP

(DO NOT CONNECT)

V

OUT

9

CLOCK

a

FEATURES

®

iMEMS

40 Milli­Low Power 2 mA
400 Hz Bandwidth
+5.0 V Single Supply Operation
2000

APPLICATIONS
Shock and Vibration Measurement
Machine Health
Shipping Recorders
Military Fuze, Safe and Arm

GENERAL DESCRIPTION

Single Chip IC Accelerometer

g

Resolution

g

Shock Survival

Accelerometer with Analog Output

The ADXL190 is a complete acceleration measurement system
on a single monolithic IC. It contains a polysilicon surface­micromachined sensor and signal conditioning circuitry to
implement an open-loop acceleration measurement architecture.
The ADXL190 is capable of measuring both positive and nega-

tive accelerations up to ±100 g, making it suitable for shock and

vibration measurement.

Typical noise floor is 4 mg/√Hz allowing signals below 40 milli-g

to be resolved. The ADXL190 can measure both dynamic accel­erations, (typical of vibration) or static accelerations, (such as
inertial force or gravity).

The ADXL190 has a two-pole Bessel switched-capacitor filter.
Bessel filters, sometimes called linear phase filters, have a step
response with minimal overshoot and a maximally flat group

ADXL190*

FUNCTIONAL BLOCK DIAGRAM

delay. The –3 dB frequency of the poles is preset at the factory
to 400 Hz. These filters are also completely self-contained and
buffered, requiring no external components.

The product features a built-in self-test feature that exercises
both the mechanical structure and electrical circuitry. When
triggered by a logic high on the self-test pin, an electrostatic
force acts on the beam equivalent to approximately 20% of full­scale acceleration input, and thus a proportional voltage change
appears on the output pin. No external components other than a
decoupling capacitor are required.

The ADXL190 is available in a hermetic 14-lead surface mount

cerpak, specified over the –40°C to +105°C temperature range.

*Patent Pending.

i

MEM

S

is a registered trademark of Analog Devices, Inc.

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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

ADXL190–SPECIFICATIONS

(TA = T

MIN

to T

, VS = +5 V, Acceleration = 0 g unless otherwise noted)

MAX

ADXL190WQC

Parameter Conditions Min Typ Max Units

SENSOR INPUT

Dynamic Range

1, 2, 3

Without Zero-g Adjust ±105 g

Alignment Error ±1 Degrees

Nonlinearity 0.2 %

Cross Axis Sensitivity ±2%

SENSITIVITY

ZERO g BIAS LEVEL

4

Initial
Temperature Drift

2, 3

Initial

5

0 g Offset vs. Temperature

5

Ratiometric 16.5 18.0 19.5 mV/g

∆ from +25°C ±0.5 %

Ratiometric 2.3 2.5 2.7 V

∆ from +25°C 1.0 g

Zero g Adjustment Gain 0.45 0.50 0.55 ∆V

/∆V 0 g Adjust

OUT

Zero g Adjust Pin Input Impedance 20 30 40 kΩ

NOISE PERFORMANCE

Noise Density 4 12 mg/√Hz rms

FREQUENCY RESPONSE

3 dB Bandwidth 360 400 Hz
Sensor Resonant Frequency 24 kHz

SELF-TEST

Output Change

6

450 990 mV
Logic “1” Voltage 3.5 V
Logic “0” Voltage 1.0 V

Input Impedance 50 kΩ

ANALOG OUTPUT

Output Voltage Range I

= ±100 µA0.25 V

OUT

– 0.25 V

S

Capacitive Load Drive 1000 pF

POWER SUPPLY

Specified Performance 4.75 5.25 V
Quiescent Supply Current 2.0 5.0 mA

TEMPERATURE RANGE

Specified Performance –40 +105 °C

NOTES

1

Product is tested at ±50 g, and the combination of 0-g error, sensitivity error, and output voltage swing measurements provide the calculations for dynamic range.

2

0-g is nominally VS/2. Use of the 0-g adjustment pin is used to null the 0-g error, resulting in increased dynamic range. It can also be used to create an asymmetrical
dynamic range if so desired.

3

The output response is ratiometric and is described by the following equation. V
Where a = 0.2 V, b = 2.712 × 10–3 1/g , c = 0.178 × 10

4

Measured at 100 Hz, ±50 g.

5

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

6

ST pin Logic “0” to “1”; ∆V

All min and max specifications are guaranteed. Typical specifications are not tested or guaranteed.
Specifications subject to change without notice.

OUT

= (∆V

@ 5 V) × (V

OUT

–3

1/g/V.

/5 V).

S

(accel, VS) = [V

OUT

/2 ±(a V

S

/5 V)] + [(accel) (b VS + c V

S

MIN

or T

MAX

.

2

)(1 ± 0.08)]

S

–2–

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