ADXL05 Datasheet, PDF (1/20 Pages) Analog Devices – +-1 g to +-5 g Single Chip Accelerometer with Signal Conditioning

a ؎1 g to ؎5 g Single Chip Accelerometer
with Signal Conditioning
ADXL05*
FEATURES
5 milli-g Resolution
Noise Level 12؋ Less than the ADXL50
User Selectable Full Scale from ؎1 g to ؎5 g
Output Scale Selectable from 200 mV/g to 1 V/g
Complete Acceleration Measurement System on a
Single Chip IC
Self Test on Digital Command
+5 V Single Supply Operation
1000 g Shock Survival
APPLICATIONS
Low Cost Sensor for Vibration Measurement
Tilt Sensing with Faster Response than Electrolytic or
Mercury Sensors
More Sensitive Alarms and Motion Detectors
Affordable Inertial Sensing of Velocity and Position
GENERAL DESCRIPTION
The ADXL05 is a complete acceleration measurement system
on a single monolithic IC. The ADXL05 will measure accelera-
tions with full-scale ranges of ± 5 g to ± 1 g or less. Typical noise
floor is 500 µg/√Hz, (12× less than the ADXL50), allowing sig-
nals below 5 milli-g to be resolved. The ADXL05 is a force bal-
anced capacitive accelerometer with the capability to measure
both ac accelerations (typical of vibration) or dc accelerations
(such as inertial force or gravity). Three external capacitors and
a +5 volt regulated power supply are all that is required to
measure accelerations up to ± 5 g. Three resistors are used to
configure the output buffer amplifier to set scale factors from
200 mV/g to 1 V/g. External capacitors may be added to the
resistor network to provide 1 or 2 poles of filtering. No addi-
tional active components are required to interface directly to
most analog to digital converters (ADCs).
The device features a TTL compatible self-test function that
can electrostatically deflect the sensor beam at any time to verify
that the sensor and its electronics are functioning correctly.
The ADXL05 is available in a hermetic 10-pin TO-100 metal
can, specified over the 0°C to +70°C commercial, and –40°C to
+85°C industrial temperature ranges. Contact factory for avail-
ability of automotive grade devices.
FUNCTIONAL BLOCK DIAGRAM
ADXL05
OSCILLATOR
DECOUPLING
CAPACITOR
4
C2
OSCILLATOR
SENSOR
SELF-TEST
(ST)
7
5
COM
1
C3
+5V
DEMODULATOR
PREAMP
REFERENCE
+3.4V
6 ^VREF
OUTPUT
+1.8V
2
C1
3
C1
DEMODULATOR
CAPACITOR
8
VPR
BUFFER
AMP
10
9
R1
VIN– _R3
R2
VOUT
*Patents pending.
REV. B
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.
© Analog Devices, Inc., 1996
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