ADXL202EB Analog Devices Inc, ADXL202EB Datasheet

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ADXL202EB

Manufacturer Part Number
ADXL202EB
Description
BOARD EVALUATION FOR ADXL202
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADXL202EB

Rohs Status
RoHS non-compliant
a
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

Related parts for ADXL202EB

ADXL202EB Summary of contents

Page 1

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 improved version of the ADXL202AQC/JQC. The ADXL202E will measure accelerations with a full-scale range ...

Page 2

ADXL202E–SPECIFICATIONS Parameter Conditions SENSOR INPUT Each Axis 2 Measurement Range Nonlinearity Best Fit Straight Line 3 Alignment Error Alignment Error X Sensor to Y Sensor 4 Cross-Axis Sensitivity SENSITIVITY Each Axis Duty Cycle per g T1/T2, V Duty Cycle per ...

Page 3

ABSOLUTE MAXIMUM RATINGS Acceleration (Any Axis, Unpowered for 0.5 ms 1000 g Acceleration (Any Axis, Powered for 0.5 ms 500 ...

Page 4

ADXL202E–Typical Performance Characteristics 1.28 1.32 1.36 1.41 1.45 1.49 1.53 VOLTS 1.25 1.31 1.36 1.42 1.48 VOLTS ...

Page 5

0.142 0.148 0.155 0.162 0.169 0.176 0.182 V 9.50 9.90 10.4 10.8 11.3 11.8 12.2 PERCENT DUTY CYCLE ...

Page 6

ADXL202E 230 250 270 290 310 330 350 NOISE DENSITY – rms 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –40 – TEMPERATURE – ...

Page 7

C ° ° –0.046 –0.038 –0.029 –0.021 –0.013 –0.004 PERCENT/ C ° 400 300 200 100 0 –100 –200 –300 –50 –25 ...

Page 8

ADXL202E DEFINITIONS T1 Length of the “on” portion of the cycle. T2 Length of the total cycle. Duty Cycle Ratio of the “on” time (T1) of the cycle to the total cycle (T2). Defined as T1/T2 for the ADXL202E/ ADXL210. ...

Page 9

DESIGN PROCEDURE FOR THE ADXL202E The design procedure for using the ADXL202E with a duty cycle output involves selecting a duty cycle period and a filter capacitor. A proper design will take into account the application requirements for bandwidth, signal ...

Page 10

ADXL202E MICROCOMPUTER INTERFACES The ADXL202E is specifically designed to work with low-cost microcontrollers. Specific code sets, reference designs, and applica- tion notes are available from the factory. This section will outline a general design procedure and discuss the various trade-offs ...

Page 11

Table V. Trade-Offs Between Microcontroller Counter Rate, T2 Period, and Resolution of Duty Cycle Modulator Counter- ADXL202E Clock Counts R Sample Rate per T2 SET T2 (ms Rate (MHz) Cycle 1.0 124 1000 2.0 2000 1.0 124 1000 ...

Page 12

ADXL202E USING THE ADXL202E IN VERY LOW POWER APPLICATIONS An application note outlining low power strategies for the ADXL202E is available. Some key points are presented here possible to reduce the ADXL202E’s average current from 0 ...

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