ADXL202E Analog Devices, ADXL202E Datasheet
ADXL202E
Manufacturer Part Number
ADXL202E
Description
Low-Cost +-2 g Dual-Axis Accelerometer with Duty Cycle Output
Manufacturer
Analog Devices
Datasheet
1.ADXL202E.pdf
(12 pages)
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GENERAL DESCRIPTION
The ADXL202E is a low-cost, low-power, complete 2-axis acceler-
ometer with a digital output, all on a single monolithic IC. It is an
improved version of the ADXL202AQC/JQC. The ADXL202E
will measure accelerations with a full-scale range of 2 g. The
ADXL202E can measure both dynamic acceleration (e.g., vibra-
tion) and static acceleration (e.g., gravity).
The outputs are analog voltage or digital signals whose duty cycles
(ratio of pulsewidth to period) are proportional to acceleration.
The duty cycle outputs can be directly measured by a micro-
processor counter, without an A/D converter or glue logic. The
duty cycle period is adjustable from 0.5 ms to 10 ms via a single
resistor (R
Patents Pending
SET
).
Low-Cost 2 g Dual-Axis Accelerometer
The typical noise floor is 200 g√Hz, allowing signals below
2 mg (at 60 Hz bandwidth) to be resolved.
The bandwidth of the accelerometer is set with capacitors C
C
structed by filtering the duty cycle output.
The ADXL202E is available in 5 mm
hermetic LCC package.
C
Y
DC
at the X
OSCILLATOR
3V TO 5.25V
X SENSOR
Y SENSOR
FILT
FUNCTIONAL BLOCK DIAGRAM
COM
V
and Y
DD
with Duty Cycle Output
DEMOD
DEMOD
FILT
ADXL202E
pins. An analog output can be recon-
R
32k
R
32k
FILT
FILT
C
X
X
Y
FILT
FILT
C
Y
ADXL202E
ANALOG
T1
CYCLE
(ADC)
5 mm
DUTY
TO
SELF-TEST
T2
A(g) = (T1/T2 – 0.5)/12.5%
0g = 50% DUTY CYCLE
T2 = R
R
T2
SET
SET
2 mm 8-lead
X
Y
/125M
OUT
OUT
C
O
U
N
R
T
E
X
and
P
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