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ADXRS642 Scheda tecnica(PDF) 8 Page - Analog Devices |
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ADXRS642 Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 10 page ADXRS642 Preliminary Technical Data Rev. Pr. A | Page 8 of 10 NULL ADJUSTMENT The nominal 2.5 V null is for a symmetrical swing range at RATEOUT (1B, 2A). However, a nonsymmetric output swing may be suitable in some applications. Null adjustment is possible by injecting a suitable current to SUMJ (1C, 2C). Note that supply disturbances may reflect some null instability. Digital supply noise should be avoided, particularly in this case. SELF-TEST FUNCTION The ADXRS642 includes a self-test feature that actuates each of the sensing structures and associated electronics in the same manner, as if subjected to angular rate. It is activated by standard logic high levels applied to Input ST1 (5F, 5G), Input ST2 (4F, 4G), or both. ST1 causes the voltage at RATEOUT to change about −0.3 V, and ST2 causes an opposite change of +0.3 V. The self-test response follows the viscosity temperature dependence of the package atmosphere, approximately 0.25%/°C. Activating both ST1 and ST2 simultaneously is not damaging. ST1 and ST2 are fairly closely matched (±2%), but actuating both simultaneously may result in a small apparent null bias shift proportional to the degree of self-test mismatch. ST1 and ST2 are activated by applying a voltage equal to VRATIO to the ST1 pin and the ST2 pin. The voltage applied to ST1 and ST2 must never be greater than AVCC. CONTINUOUS SELF-TEST The on-chip integration of the ADXRS642 gives it higher reliability than is obtainable with any other high volume manufacturing method. Also, it is manufactured under a mature BiMOS process that has field-proven reliability. As an additional failure detection measure, power-on self-test can be performed. However, some applications may warrant continuous self-test while sensing rate. Details outlining continuous self-test techniques are also available in the AN-768 Application Note. MECHANICAL PERFORMANCE The ADXRS642 excellent vibration rejection is demonstrated in the graphs below. Figure 6 shows the ADXRS642 output response with and without 15g RMS 50Hz to 5kHz of random vibration. Bandwidth of the gyro was limited to 1600Hz. Performance is similar regardless of the direction of input vibration. Figure 6. ADXRS642 Output Response With and Without Random Vibration (15g RMS, 50Hz to 5kHz) Figure 7 demonstrates the ADXRS642 DC bias response to 5g Sine vibration over the 20Hz to 5kHz range. As can be seen, there are no sensitive frequencies present and vibration rectification is vanishingly small. As in the previous example gyro bandwidth was set to 1600Hz. Figure 7. ADXRS642 Sine Vibration Output Response (5g, 20Hz to 5kHz) 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1000 10000 Frequency ‐0.04 ‐0.02 0 0.02 0.04 0.06 0.08 0.1 0.12 10 100 1000 10000 Hz |
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