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AD7715 Datasheet(PDF) 19 Page - Analog Devices |
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AD7715 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 41 page  AD7715 Data Sheet Rev. E | Page 18 of 40 CALIBRATION SEQUENCES The AD7715 contains a number of calibration options as outlined in Table 13. Table 23 summarizes the calibration types, the operations involved and the duration of the operations. There are two methods of determining the end of calibration. The first is to monitor when DRDY returns low at the end of the sequence. DRDY not only indicates when the sequence is complete but also that the part has a valid new sample in its data register. This valid new sample is the result of a normal conversion which follows the calibration sequence. The second method of determining when calibration is complete is to monitor the MD1 and MD0 bits of the setup register. When these bits return to 0, 0 following a calibration command, it indicates that the calibration sequence is complete. This method does not give any indication of there being a valid new result in the data register. However, it gives an earlier indication than DRDY that calibration is complete. The duration to when the mode bits (MD1 and MD0) return to 0, 0 represents the duration of the calibration carried out. The sequence to when DRDY goes low also includes a normal conversion and a pipeline delay, tP, to correctly scale the results of this first conversion. tP will never exceed 2000 × tCLKIN. The time for both methods is given in Table 23. Table 23. Calibration Sequences Calibration Type MD1, MD0 Calibration Sequence Duration to Mode Bits Duration to DRDY Self Calibration 0, 1 Internal ZS Cal @ Selected Gain + 6 × 1/Output Rate 9 ×1/Output Rate + tP Internal FS Cal @ Selected Gain ZS System Calibration 1, 0 ZS Cal on AIN @ Selected Gain 3 × 1/Output Rate 4 × 1/Output Rate + tP FS System Calibration 1, 1 FS Cal on AIN @ Selected Gain 3 × 1/Output Rate 4 × 1/Output Rate + tP |
Similar Part No. - AD7715_17 |
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Similar Description - AD7715_17 |
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