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ADXL203CE-REEL1 Scheda tecnica(PDF) 8 Page - Analog Devices |
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ADXL203CE-REEL1 Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 12 page 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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