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ADXL001 Datasheet(PDF) 8 Page - Analog Devices |
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ADXL001 Datasheet(HTML) 8 Page - Analog Devices |
8 / 10 page 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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