ADXL311 Datasheet, PDF (1/12 Pages) Analog Devices – Low Cost, Ultracompact ±2 g Dual-Axis Accelerometer

FEATURES
Low cost
High resolution
Dual-axis accelerometer on a single IC chip
5 mm × 5 mm × 2 mm CLCC package
Low power < 400 µA (typ)
X-axis and Y-axis aligned to within 0.1° (typ)
BW adjustment with a single capacitor
Single-supply operation
High shock survival
APPLICATIONS
Tilt and motion sensing in cost-sensitive applications
Smart handheld devices
Computer security
Input devices
Pedometers and activity monitors
Game controllers
Toys and entertainment products
Low Cost, Ultracompact
±2 g Dual-Axis Accelerometer
ADXL311
GENERAL DESCRIPTION
The ADXL311 is a low cost, 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 100 million Analog
Devices accelerometers shipped to date, with demonstrated
1 FIT reliability (1 failure per 1 billion device operating hours).
The ADXL311 will measure 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.
The typical noise floor is 300 µg/√Hz allowing signals below
2 mg (0.1° of inclination) to be resolved in tilt sensing appli-
cations using narrow bandwidths (10 Hz).
The user selects the bandwidth of the accelerometer using
capacitors C_X and C_Y at the X_FILT and Y_FILT pins. Bandwidths
of 1 Hz to 2 kHz may be selected to suit the application.
The ADXL311 is available in a 5 mm × 5 mm × 2 mm
8-terminal hermetic CLCC package
CDC
3.0V
V_DD
C_X
X_OUT
X SENSOR
R_FILT
32kΩ
DEMOD
OSCILLATOR
ADXL311JE
Y SENSOR
DEMOD
32kΩ
R_FILT
COM
Y_OUT
CY
SELF TEST
BIAS
200kΩ
Figure 1. Functional Block Diagram
Rev. A
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