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AS5181F-SPACE Datasheet(PDF) 10 Page - Austin Semiconductor |
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AS5181F-SPACE Datasheet(HTML) 10 Page - Austin Semiconductor |
10 / 16 page D D D D DA A A A AC C C C C AS5181 AS5181 Rev. 0.3 6/05 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 10 Austin Semiconductor, Inc. POWER-DOWN MODE SELECTION PD (POWER-DOWN SELECT) DACEN (DAC ENABLE) POWER-DOWN MODE OUTPUT STATE 0 0 Standby High-Z 0 1 Wake-Up Last state prior to standby mode 1 X Shutdown High-Z X = Don’t Care FIGURE 3: AS5181 with External Reference APPLICATIONS INFORMATION Static and Dynamic Performance Definitions Integral Nonlinearity Integral nonlinearity (INL) (Figure 5a) is the deviation of the values on an actual transfer function from either a best- straight-line fit (closest approximation to the actual transfer curve) or a line drawn between the endpoints of the transfer function once offset and gain errors have been nullified. For a DAC, the deviations are measured every single step. Differential Nonlinearity Differential nonlinearity (DNL) (Figure 5b) is the difference between an actual step height and the ideal value of 1LSB. A DNL error specification of less than 1LSB guarantees no missing codes and a monotonic transfer function. Offset Error Offset error (Figure 5c) is the difference between the ideal and the actual offset point. For a DAC, the offset point is the step value when the digital input is zero. This error affects all codes by the same amount and can usually be compensated by trimming. Gain Error Gain error (Figure 5d) is the difference between the ideal and the actual full-scale output voltage on the transfer curve, after nullifying the offset error. This error alters the slope of the transfer function and corresponds to the same percentage error in each step. Settling Time Settling time is the amount of time required from the start of a transition until the DAC output settles its new output value to within the converter’s specified accuracy. |
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