参数资料
型号: ADC0805LCN
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: ADC
英文描述: 8-Bit uP Compatible A/D Converters
中文描述: 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP20
封装: PLASTIC, DIP-20
文件页数: 17/41页
文件大小: 1118K
代理商: ADC0805LCN
Functional Description
(Continued)
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 con-
tinuously displayed and includes the quantization uncertainty
of the A/D. For example the error at point 1 of Figure 1is +
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 upside 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
A
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相关PDF资料
PDF描述
ADC0801 8-Bit uP Compatible A/D Converters
ADC0802 8-Bit uP Compatible A/D Converters
ADC0802LCN 8-Bit uP Compatible A/D Converters
ADC0805 8-Bit uP Compatible A/D Converters
ADC0802LCWM 8-Bit uP Compatible A/D Converters
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