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ADXL05 Fiches technique(PDF) 10 Page - Analog Devices |
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ADXL05 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 20 page ADXL05 REV. B –10– The output of the synchronous demodulator drives the preamp—an instrumentation amplifier buffer which is refer- enced to +1.8 volts. The output of the preamp, VPR, is fed back to the outer plate of the sensor through a 3 M Ω isolation resis- tor. The VPR voltage electrostatically resets the sensor back to its 0 g position and is a direct measure of the applied acceleration. The output of the ADXL05’s preamplifier is 1.8 V ± 200 mV/g, with an output range of ±1 V for a ±5 g input. An uncommit- ted buffer amplifier provides the capability to adjust the scale factor and 0 g offset level over a wide range. An internal refer- ence supplies the necessary regulated voltages for powering the chip and +3.4 volts for external use. A self-test is initiated by applying a TTL “high” level voltage (> +2.0 V dc) to the ADXL05’s self-test pin, which causes the chip to apply a deflection voltage to the beam which moves it an amount equal to –5 g (the negative full-scale output of the de- vice). Note that the ±15% tolerance of the self-test circuit is not proportional to the sensitivity error, see Self-Test section. BASIC CONNECTIONS FOR THE ADXL05 Figure 19 shows the basic connections needed for the ADXL05 to measure accelerations in the ±5 g range with an output scale factor 400 mV/g, a 2.5 V 0 g level, a ±2.0 V full-scale swing around 0 g, and a 3 dB bandwidth of approximately 1.6 kHz. Using the circuit of Figure 19, the overall transfer function is: VOUT = R3 R1 1.8 V – VPR () ()+ R3 R2 (1.8) ()+1.8V SENSOR REFERENCE 6 9 10 8 3 2 1 5 7 4 DEMODULATOR BUFFER AMP PREAMP OSCILLATOR ADXL05 C2 0.022 µF OSCILLATOR DECOUPLING CAPACITOR C3 0.1 µF +5V DEMODULATOR CAPACITOR C1 C1 COM R1 49.9k Ω VPR VIN– R3 100k Ω VREF OUTPUT R2 274k Ω +3.4V VOUT SELF-TEST (ST) +1.8V 0.022 µF Figure 19. ADXL05 Application Providing an Output Sensitivity of 400 mV/g, a +2.5 V 0 g Level and a Bandwidth of 1 kHz OBSOLETE |
Numéro de pièce similaire - ADXL05_15 |
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Description similaire - ADXL05_15 |
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