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AD5347 Datasheet(PDF) 10 Page - Analog Devices |
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AD5347 Datasheet(HTML) 10 Page - Analog Devices |
10 / 24 page AD5346/AD5347/AD5348 Rev. 0 | Page 10 of 24 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 plots can be seen in Figure 14, Figure 15, and Figure 16. 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 monotonic by design. Typical DNL versus code plots can be seen in Figure 17, Figure 18, and Figure 19. 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 and is expressed as a percentage of the full-scale range. This is illustrated in Figure 11. 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 still positive at zero input code. This is shown in Figure 12. Because the DACs operate from a single supply, a negative offset cannot appear at the output of the buffer amplifier. Instead, there is a code close to zero at which the amplifier output saturates (amplifier footroom). Below this code there is a dead band over which the output voltage does not change. This is illustrated in Figure 13. OUTPUT VOLTAGE DAC CODE POSITIVE GAIN ERROR NEGATIVE GAIN ERROR ACTUAL IDEAL Figure 11. Gain Error OUTPUT VOLTAGE DAC CODE POSITIVE OFFSET GAIN ERROR AND OFFSET ERROR ACTUAL IDEAL Figure 12. Positive Offset Error and Gain Error AMPLIFIER FOOTROOM (~1mV) NEGATIVE OFFSET OUTPUT VOLTAGE DAC CODE GAIN ERROR AND OFFSET ERROR DEADBAND CODES ACTUAL IDEAL NEGATIVE OFFSET Figure 13. Negative Offset Error and Gain Error |
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