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LTC1454CN Datasheet(PDF) 7 Page - Linear Technology |
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LTC1454CN Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1454/LTC1454L DEFI ITIO S LSB = (VFS – VOS)/(2n – 1) = (VFS – VOS)/4095 Nominal LSBs: LTC1454 LSB = 4.095V/4095 = 1mV LTC1454L LSB = 2.5V/4095 = 0.610mV Integral Nonlinearity (INL): End-point INL is the maxi- mum deviation from a straight line passing through the end-points of the DAC transfer curve. Because the part operates from a single supply and the output cannot go below zero, the linearity is measured between full scale and the code corresponding to the maximum offset speci- fication. The INL error at a given input code is calculated as follows: INL = [VOUT – VOS – (VFS – VOS)(Code/4095)]/LSB VOUT = The output voltage of the DAC measured at the given input code Differential Nonlinearity (DNL): DNL is the difference between the measured change and the ideal 1LSB change between any two adjacent codes. The DNL error between any two codes is calculated as follows: DNL = ( ∆VOUT – LSB)/LSB ∆VOUT = The measured voltage difference between two adjacent codes Digital Feedthrough: The glitch that appears at the analog output caused by AC coupling from the digital inputs when they change state. The area of the glitch is specified in (nV)(sec). Resolution (n): Resolution is defined as the number of digital input bits, n. It defines the number of DAC output states (2n) that divide the full-scale range. The resolution does not imply linearity. Full-Scale Voltage (VFS): This is the output of the DAC when all bits are set to 1. Voltage Offset Error (VOS): The theoretical voltage at the output when the DAC is loaded with all zeros. The output amplifier can have a true negative offset, but because the part is operated from a single supply, the output cannot go below zero. If the offset is negative, the output will remain near 0V resulting in the transfer curve shown in Figure 1. DAC CODE LTC1454/5 • F01 OUTPUT VOLTAGE NEGATIVE OFFSET 0V Figure 1. Effect of Negative Offset The offset of the part is measured at the code that corre- sponds to the maximum offset specification: VOS = VOUT – (Code)(VFS)/(2 n – 1) Least Significant Bit (LSB): One LSB is the ideal voltage difference between two successive codes. |
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