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AD7150 Arkusz danych(PDF) 14 Page - Analog Devices |
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AD7150 Arkusz danych(HTML) 14 Page - Analog Devices |
14 / 29 page AD7150 Rev. 0 | Page 13 of 28 AUTOCAPDAC ADJUSTMENT In adaptive threshold mode, the part can dynamically adjust the CAPDAC to keep the CDC in an optimal operating capacitive range. When the AutoDAC function is enabled, the CAPDAC value is automatically incremented when the data average exceeds three-fourths of the CDC full range, and the CAPDAC value is decremented when the data average goes below one- fourth of the CDC full range. The AutoDAC increment or decrement step depends on the selected CDC capacitive input range. See the Setup Registers section. POWER-DOWN TIMER In power sensitive applications, the AD7150 can be set to automatically enter power-down mode after a programmed period of time in which the outputs have not been activated. The AD7150 can be then returned to a normal operational mode either via the serial interface or by the power supply off/on sequence. POWER SUPPLY MONITOR When the AD7150 VDD power supply voltage drops below a defined level needed for correct CDC operation, the on-chip power supply monitor stops the adaptive threshold logic and holds it in reset. After the VDD reaches the required level, the threshold logic is released, and the data average is reset to the value of the first conversion finished at the correct power supply voltage. This feature prevents the adaptive threshold from being set incorrectly after a very slow rise of the VDD voltage or from being corrupted by accidental drops in the VDD voltage. The other AD7150 functions continue working below the power supply monitor threshold, down to approximately 1.0V..1.8V, the exact level depending on the manufacturing process variation. In the region of the low VDD voltage, the part is still accessible via the serial interface and continues conversion. However, the conversion results may be incorrect and, therefore, the data should not be considered valid if the part operates below the power supply monitor threshold. The status of the power supply monitor can be determined by reading the PwrDown bit in the AD7150 status register. |
Podobny numer części - AD7150_17 |
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Podobny opis - AD7150_17 |
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