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LTC1657LCGN Datasheet(PDF) 6 Page - Linear Technology |
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LTC1657LCGN Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LTC1657L Figure 1. Effect of Negative Offset 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. 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): Normally, the DAC offset is the voltage at the output when the DAC is loaded with all zeros. The DAC 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. DEFI ITIO S DAC CODE 1657 F01 OUTPUT VOLTAGE NEGATIVE OFFSET 0V The offset of the part is measured at the code that corre- sponds to the maximum offset specification: VOS = VOUT – [(Code)(VFS)/(2n – 1)] Least Significant Bit (LSB): One LSB is the ideal voltage difference between two successive codes. LSB = (VFS – VOS)/(2n – 1) = (VFS – VOS)/65535 Nominal LSBs: LTC1657L LSB = 2.5V/65535 = 38.1 µV DAC Transfer Characteristic: VG REFHI REFLO CODE REFLO OUT = () + • – 65536 G = 1 for X1/X2 connected to VOUT G = 2 for X1/X2 connected to GND CODE = Decimal equivalent of digital input (0 ≤ CODE ≤ 65535) Zero-Scale Error (ZSE): The output voltage when the DAC is loaded with all zeros. Since this is a single supply part, this value cannot be less than 0V. 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 specification. The INL error at a given input code is calculated as follows: INL (In LSBs) = [VOUT – VOS – (VFS – VOS) (code/65535)] 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 one LSB 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 • s. |
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