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ADXRS623 Datenblatt(PDF) 10 Page - Analog Devices |
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ADXRS623 Datenblatt(HTML) 10 Page - Analog Devices |
10 / 12 page ADXRS623 Rev. 0 | Page 10 of 12 ADXRS623 AND SUPPLY RATIOMETRICITY The ADXRS623 RATEOUT and TEMP signals are ratiometric to the VRATIO voltage; that is, the null voltage, rate sensitivity, and temperature outputs are proportional to VRATIO. Thus, the ADXRS623 is most easily used with a supply-ratiometric ADC that results in self-cancellation of errors due to minor supply variations. There is some small error due to nonratiometric behavior. Typical ratiometricity error for null, sensitivity, self- test, and temperature output is outlined in Table 4. Note that VRATIO must never be greater than AVCC. Table 4. Ratiometricity Error for Various Parameters Parameter VS = VRATIO = 4.85 V VS = VRATIO = 5.15 V ST1 Mean 0.3% 0.09% Sigma 0.21% 0.19% ST2 Mean −0.15% −0.2% Sigma 0.22% 0.2% Null Mean −0.3% −0.05% Sigma 0.2% 0.08% Sensitivity Mean 0.003% −0.25% Sigma 0.06% 0.06% VTEMP Mean −0.2% −0.04% Sigma 0.05% 0.06% NULL ADJUSTMENT The nominal 2.5 V null is for a symmetrical swing range at RATEOUT (1B, 2A). However, a nonsymmetrical 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 ADXRS623 includes a self-test feature that actuates each of the sensing structures and associated electronics 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 −1.0 V, and ST2 causes an opposite change of +1.0 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 (±5%), 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 of greater than 0.8 × VRATIO to the ST1 and ST2 pins. ST1 and ST2 are deacti- vated by applying a voltage of less than 0.2 × VRATIO to the ST1 and ST2 pins. The voltage applied to ST1 and ST2 must never be greater than AVCC. CONTINUOUS SELF-TEST The one-chip integration of the ADXRS623 gives it higher reliability than is obtainable with any other high volume manufacturing method. In addition, it is manufactured under a mature BiMOS process with field-proven reliability. As an additional failure detection measure, a power-on self-test can be performed. However, some applications may warrant continuous self-test while sensing rate. Details about continuous self-test techniques are available in the AN-768 Application Note, Using the ADXRS150/ADXRS300 in Continuous Self-Test Mode, avail- able at www.analog.com. |
Ähnliche Teilenummer - ADXRS623 |
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Ähnliche Beschreibung - ADXRS623 |
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