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ADC0804LCJ Arkusz danych(PDF) 17 Page - National Semiconductor (TI) |
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ADC0804LCJ Arkusz danych(HTML) 17 Page - National Semiconductor (TI) |
17 / 41 page Functional Description (Continued) ±1⁄2 LSB from the ideal center-values. Each tread (the range of analog input voltage that provides the same digital output code) is therefore 1 LSB wide. Figure 2 shows a worst case error plot for the ADC0801. All center-valued inputs are guaranteed to produce the correct output codes and the adjacent risers are guaranteed to be no closer to the center-value points than ±1⁄4 LSB. In other words, if we apply an analog input equal to the center-value ±1⁄4 LSB, we guarantee that the A/D will produce the correct digital code. The maximum range of the position of the code transition is indicated by the horizontal arrow and it is guar- anteed to be no more than 1⁄2 LSB. The error curve of Figure 3 shows a worst case error plot for the ADC0802. Here we guarantee that if we apply an analog input equal to the LSB analog voltage center-value the A/D will produce the correct digital code. Next to each transfer function is shown the corresponding error plot. Many people may be more familiar with error plots than transfer functions. The analog input voltage to the A/D is provided by either a linear ramp or by the discrete output steps of a high resolution DAC. Notice that the error is continuously displayed and includes the quantization uncer- tainty of the A/D. For example the error at point 1 of Figure 1 is +1⁄2 LSB because the digital code appeared 1⁄2 LSB in advance of the center-value of the tread. The error plots always have a constant negative slope and the abrupt up- side steps are always 1 LSB in magnitude. Transfer Function DS005671-81 Error Plot DS005671-82 FIGURE 1. Clarifying the Error Specs of an A/D Converter Accuracy=±0 LSB: A Perfect A/D Transfer Function DS005671-83 Error Plot DS005671-84 FIGURE 2. Clarifying the Error Specs of an A/D Converter Accuracy=±1⁄4 LSB www.national.com 17 |
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