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ADXL203CE-REEL1 Scheda tecnica(PDF) 8 Page - Analog Devices

Il numero della parte ADXL203CE-REEL1
Spiegazioni elettronici  Precision 짹1.7 g Single/Dual Axis Accelerometer
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADXL203CE-REEL1 Scheda tecnica(HTML) 8 Page - Analog Devices

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ADXL103/ADXL203
Rev. 0 | Page 8 of 12
THEORY OF OPERATION
EARTH'S SURFACE
TOP VIEW
(Not to Scale)
PIN 8
XOUT = 2.5V
YOUT = 1.5V
XOUT = 2.5V
YOUT = 2.5V
PIN 8
XOUT = 2.5V
YOUT = 3.5V
PIN 8
XOUT = 1.5V
YOUT = 2.5V
PIN 8
XOUT = 3.5V
YOUT = 2.5V
Figure 21. Output Response vs. Orientation
The ADXL103/ADXL203 are complete acceleration measure-
ment systems on a single monolithic IC. The ADXL103 is a
single axis accelerometer, while the ADXL203 is a dual axis
accelerometer. Both parts contain a polysilicon surface-
micromachined sensor and signal conditioning circuitry to
implement an open-loop acceleration measurement architec-
ture. The output signals are analog voltages proportional to
acceleration. The ADXL103/ADXL203 are capable of measuring
both positive and negative accelerations to at least ±1.7 g. The
accelerometer can measure static acceleration forces such as
gravity, allowing it to be used as a tilt sensor.
The sensor is a surface-micromachined polysilicon structure
built on top of the silicon wafer. Polysilicon springs suspend the
structure over the surface of the wafer and provide a resistance
against acceleration forces. Deflection of the structure is mea-
sured using a differential capacitor that consists of independent
fixed plates and plates attached to the moving mass. The fixed
plates are driven by 180° out-of-phase square waves. Accelera-
tion will deflect the beam and unbalance the differential
capacitor, resulting in an output square wave whose amplitude
is proportional to acceleration. Phase sensitive demodulation
techniques are then used to rectify the signal and determine the
direction of the acceleration.
The output of the demodulator is amplified and brought off-
chip through a 32 kΩ resistor. At this point, the user can set the
signal bandwidth of the device by adding a capacitor. This
filtering improves measurement resolution and helps prevent
aliasing.
PERFORMANCE
Rather than using additional temperature compensation
circuitry, innovative design techniques have been used to ensure
high performance is built in. As a result, there is essentially no
quantization error or non-monotonic behavior, and
temperature hysteresis is very low (typically less than 10 mg
over the –40°C to +125°C temperature range).
Figure 9 shows the zero g output performance of eight parts (X
and Y axis) over a –40°C to +125°C temperature range.
Figure 12 demonstrates the typical sensitivity shift over
temperature for VS = 5 V. Sensitivity stability is optimized for
VS = 5 V, but is still very good over the specified range; it is
typically better than ±1% over temperature at VS = 3 V.


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