ADXL213 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADXL213

Low Cost ±1.2 g Dual Axis Accelerometer

Analog Devices 

Low Cost ±1.2 g Dual

Axis Accelerometer

ADXL213

FEATURES

Dual axis accelerometer on a single IC chip

5 mm × 5 mm × 2 mm LCC package

1 mg resolution at 60 Hz

Low power: 700 µA at VS = 5 V (typical)

High zero g bias stability

High sensitivity accuracy

Pulse width modulated digital outputs

X and Y axes aligned to within 0.1° (typical)

BW adjustment with a single capacitor

Single-supply operation

3500 g shock survival

APPLICATIONS

Automotive tilt alarms

Data projectors

Navigation

Platform stabilization/leveling

Alarms and motion detectors

High accuracy, 2-axis tilt sensing

GENERAL DESCRIPTION

The ADXL213 is a low cost, low power, complete dual axis

accelerometer with signal conditioned, duty cycle modulated

outputs, all on a single monolithic IC. The ADXL213 measures

acceleration with a full-scale range of ±1.2 g (typical). The

ADXL213 can measure both dynamic acceleration (e.g.,

vibration) and static acceleration (e.g., gravity).

The outputs are digital signals whose duty cycles (ratio of pulse

width to period) are proportional to acceleration (30%/g). The

duty cycle outputs can be directly measured by a microcontrol-

ler without an A/D converter or glue logic.

Innovative design techniques are used to ensure high zero g bias

stability (typically better than 0.25 mg/°C), as well as tight sensi-

tivity stability (typically better than 50 ppm/°C).

The typical noise floor is 160 µg/√Hz, allowing signals below

1 mg (0.06° of inclination) to be resolved in tilt sensing applica-

tions using narrow bandwidths (<60 Hz).

The user selects the bandwidth of the accelerometer using

capacitors CX and CY at the XFILT and YFILT pins. Bandwidths of

0.5 Hz to 250 Hz may be selected to suit the application.

The ADXL213 is available in a 5 mm × 5 mm × 2 mm, 8-pad

hermetic LCC package.

FUNCTIONAL BLOCK DIAGRAM

+VS

+VS

CY

YFILT

ADXL213

CDC

SENSOR

AC

AMP

DEMOD

OUTPUT 32kΩ

AMP

OUTPUT

AMP 32kΩ

DCM

YOUT

XOUT

COM

ST

XFILT

CX

T2

RSET

T2

T1

A(g) = (T1/T2 – 0.5)/30%

0g = 50% DUTY CYCLE

T2(s) = RSET/125MΩ

Figure 1.

Rev. 0

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Tel: 781.329.4700

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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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