ADXL311| Datasheet

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Ultracompact 2g Dual-Axis Accelerometer

ADXL311
FEATURES
High resolution Dual-axis accelerometer on a single IC chip 5 mm 5 mm 2 mm LCC package Low power <400 uA (typ) X-axis and Y-axis aligned to within 0.1 (typ) BW adjustment with a single capacitor Single-supply operation High shock survival

FUNCTIONAL BLOCK DIAGRAM
3.0V VDD X SENSOR DEMOD XFILT 32k CX XOUT SELF TEST

CDC

OSCILLATOR YFILT 32k DEMOD Y SENSOR COM YOUT

ADXL311

APPLICATIONS
Tilt and motion sensing Smart hand-held devices Computer security Input devices Pedometers and activity monitors Game controllers Toys and entertainment products

Figure 1.

GENERAL DESCRIPTION
The ADXL311 is a low power, complete dual-axis accelerometer with signal conditioned voltage outputs, all on a single monolithic IC. The ADXL311 is built using the same proven iMEMS process used in over 180 million Analog Devices accelerometers shipped to date, with demonstrated 1 FIT reliability (1 failure per 1 billion device operating hours).

The typical noise floor is 300 ug/Hz, allowing signals below 2 mg (0.1 of inclination) to be resolved in tilt sensing applications using narrow bandwidths (10 Hz). The user selects the bandwidth of the accelerometer using capacitors CX and CY at the XOUT and YOUT pins. Bandwidths of 1 Hz to 3 kHz can be selected to suit the application. The ADXL311 is available in a 5 mm 5 mm 2 mm, 8-terminal, hermetic LCC package.

The ADXL311 measures acceleration with a full-scale range of 2 g. The ADXL311 can measure both dynamic acceleration (e.g., vibration) and static acceleration (e.g., gravity). The outputs are analog voltages proportional to acceleration.

Rev. B
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