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ADXL001-250 Datasheet(Arkusz danych) 8 Page - Analog Devices

Numer części ADXL001-250
Szczegółowy opis  High Performance Wide Bandwidth Accelerometer
Pobierz  10 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXL001
Preliminary Technical Data
This information applies to an ongoing development. Its characteristics and specifications are subject to change without notice.
Analog Devices assumes no obligation regarding future manufacturing unless otherwise agreed to in writing. Patents pending.
Rev. PrA | Page 8 of 10
APPLICATIONS
APPLICATION CIRCUIT
Figure 6 shows the standard application circuit for the
ADXL001. Note that VDD and VDD2 should always be connected.
The output is shown connected to a 1000 pF output capacitor
for improved EMI performance and can be connected directly
to the ADC input of a microcontroller. See the ADC
specifications for proper antialiasing filtering, based on the
user’s sample rate.
Figure 6. Application Circuit
SELF-TEST
The fixed fingers in the forcing cells are normally kept at the
same potential as that of the movable frame. When the user
activates the digital self-test input, the ADXL001 changes the
voltage on the fixed fingers in these forcing cells on one side of
the moving plate. This potential creates an attractive electro-
static force, causing the sensor to move towards those fixed
fingers. The entire signal channel is active, so the sensor
displacement causes a change in Xout. The ADXL001 self-test
function verifies proper operation of the sensor, interface
electronics, and accelerometer channel electronics.
The ST pin should never be exposed to voltages greater than
VS + 0.3 V. If this cannot be guaranteed due to the system
design (for instance, if there are multiple supply voltages), then
a low VF clamping diode between ST and VS is recommended.
ACCELERATION SENSITIVE AXIS
The ADXL001 is an X-Axis acceleration and vibration-sensing
device. It produces a positive-going output voltage for vibration
toward its Pin 8 marking.
PIN 8
Figure 7. XOUT Increases with Acceleration in the +X-Axis Direction
OPERATING VOLTAGES OTHER THAN 5V
The ADXL001 is specified at VS = 3.3 V and VS = 5 V. Note that
some performance parameters change as the voltage is varied.
In particular, the Xout output exhibits ratiometric offset and
sensitivity with supply. The output sensitivity (or scale factor)
scales proportionally to the supply voltage. At VS = 3.3 V, output
sensitivity is typically 16 mV/g. At VS = 5 V, sensitivity is
nominally 24.2 mV/g. Xout zero g bias is nominally equal to
VS/2 at all supply voltages.
Self-test response in g is roughly proportional to the square of
the supply voltage. However, when one factors ratiometricity of
sensitivity in with supply voltage, the self-test response in
voltage is roughly proportional to the cube of the supply
voltage. For example, the self-test response for the ADXL001-70
at VS = 5 V is approximately 1.4 V. At VS = 3.3 V, the response is
approximately 400 mV.




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