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AD7151 データシート(PDF) 13 Page - Analog Devices |
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AD7151 データシート(HTML) 13 Page - Analog Devices |
13 / 29 page AD7151 Rev. 0 | Page 12 of 28 SENSITIVITY In adaptive threshold mode, the output comparator threshold is set as a defined distance (sensitivity) above the data average, below the data average, or both, depending on the selected threshold mode of operation (see Figure 29). The sensitivity value is programmable in the range 0 to 255 LSBs of the 12-bit CDC converter (see the Register Descriptions section). NEGATIVE THRESHOLD POSITIVE THRESHOLD DATA AVERAGE OUTPUT ACTIVE TIME SENSITIVITY DATA SENSITIVITY Figure 29. Threshold Sensitivity HYSTERESIS In adaptive threshold mode, the comparator features hysteresis. The hysteresis is fixed to one-fourth of the threshold sensitivity and can be programmed on or off. The comparator does not have hysteresis in the fixed threshold mode. OUTPUT POSITIVE THRESHOLD DATA AVERAGE OUTPUT ACTIVE TIME HYSTERSIS DATA Figure 30. Threshold Hysteresis TIMEOUT In the case of a large, long change in the capacitive input, when the data average adapting to a new condition may take too long, a timeout can be set. The timeout becomes active (counting) when the CDC data goes outside the band of data average ± sensitivity. When the timeout elapses (a defined number of CDC conversions is counted), the data average (and thus the threshold) is forced to follow the new CDC data value immediately (see Figure 31). The timeout can be set independently for approaching (for change in data toward the threshold) and for receding (for change in data away from the threshold). See Figure 32, Figure 33, and the Register Descriptions section. DATA AVERAGE + SENSITIVITY LARGE CHANGE IN DATA DATA AVERAGE DATA AVERAGE – SENSITIVITY TIME TIMEOUT Figure 31. Threshold Timeout After a Large Change in CDC Data INPUT CAPACITANCE THRESHOLD OUTPUT DATA AVERAGE OUTPUT ACTIVE TIME TIMEOUT APPROACHING Figure 32. Approaching Timeout in Negative Threshold Mode Shortens False Output Trigger INPUT CAPACITANCE LARGE CHANGE THRESHOLD OUTPUT OUTPUT ACTIVE TIME TIMEOUT RECEDING Figure 33. Positive Timeout in Negative Threshold Mode Shortens Period of Missing Output Trigger |
同様の部品番号 - AD7151_17 |
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同様の説明 - AD7151_17 |
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