ADXL311_15 Datasheet, PDF (1/12 Pages) Analog Devices – Ultracompact 2g Dual-Axis Accelerometer

Ultracompact ±2g Dual-Axis Accelerometer
ADXL311
FEATURES
FUNCTIONAL BLOCK DIAGRAM
High resolution
Dual-axis accelerometer on a single IC chip
5 mm × 5 mm × 2 mm LCC package
3.0V
V_DD
C_X
X_OUT
SELF TEST
Low power <400 µA (typ)
X-axis and Y-axis aligned to within 0.1° (typ)
X SENSOR
DEMOD
X_FILT
32kΩ
BW adjustment with a single capacitor
Single-supply operation
High shock survival
APPLICATIONS
E ^{Tilt and motion sensing}
Smart hand-held devices
Computer security
Input devices
T _{Pedometers and activity monitors}
Game controllers
Toys and entertainment products
E _{GENERAL DESCRIPTION}
L 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
O ^{accelerometers shipped to date, with demonstrated 1 FIT}
reliability (1 failure per 1 billion device operating hours).
The ADXL311 measures acceleration with a full-scale range of
S ±2 g. The ADXL311 can measure both dynamic acceleration
(e.g., vibration) and static acceleration (e.g., gravity). The
OB ^{outputs are analog voltages proportional to acceleration.}
CDC
OSCILLATOR
DEMOD
Y_FILT
32kΩ
Y SENSOR
ADXL311
COM
Y_OUT
C_Y
Figure 1.
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_OUT and Y_OUT 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.
Rev. B
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