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AD5332BRU bảng dữ liệu(PDF) 9 Page - Analog Devices |
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AD5332BRU bảng dữ liệu(HTML) 9 Page - Analog Devices |
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9 / 20 page  REV. 0 AD5332/AD5333/AD5342/AD5343 –9– TERMINOLOGY RELATIVE ACCURACY For the DAC, Relative Accuracy or Integral Nonlinearity (INL) is a measure of the maximum deviation, in LSBs, from a straight line passing through the actual endpoints of the DAC transfer function. Typical INL versus Code plot can be seen in Figures 5, 6, and 7. DIFFERENTIAL NONLINEARITY Differential Nonlinearity (DNL) is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonicity. This DAC is guaranteed mono- tonic by design. Typical DNL versus Code plot can be seen in Figures 8, 9, and 10. OFFSET ERROR This is a measure of the offset error of the DAC and the output amplifier. It is expressed as a percentage of the full-scale range. If the offset voltage is positive, the output voltage will still be positive at zero input code. This is shown in Figure 3. Because the DACs operate from a single supply, a negative offset cannot appear at the output of the buffer amplifier. Instead, there will be a code close to zero at which the amplifier output saturates (amplifier footroom). Below this code there will be a deadband over which the output voltage will not change. This is illustrated in Figure 4. GAIN ERROR This is a measure of the span error of the DAC (including any error in the gain of the buffer amplifier). It is the deviation in slope of the actual DAC transfer characteristic from the ideal expressed as a percentage of the full-scale range. This is illus- trated in Figure 2. DAC CODE POSITIVE GAIN ERROR NEGATIVE GAIN ERROR OUTPUT VOLTAGE ACTUAL IDEAL Figure 2. Gain Error DAC CODE POSITIVE OFFSET OUTPUT VOLTAGE GAIN ERROR AND OFFSET ERROR ACTUAL IDEAL Figure 3. Positive Offset Error and Gain Error OUTPUT VOLTAGE DAC CODE NEGATIVE OFFSET GAIN ERROR AND OFFSET ERROR AMPLIFIER FOOTROOM (~ 1mV) NEGATIVE OFFSET DEADBAND CODES ACTUAL IDEAL Figure 4. Negative Offset Error and Gain Error |
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