ADC0804LCN National Semiconductor, ADC0804LCN Datasheet - Page 17

• Manufacturer Part Number: ADC0804LCN
• Description: IC, ADC, 8BIT, 9708SPS, DIP-20
• Manufacturer: National Semiconductor

Specifications of ADC0804LCN

• Resolution (bits): 8bit
• Sampling Rate: 9.708kSPS
• Input Channel Type: Differential
• Data Interface: CMOS, Parallel, TTL
• Supply Current: 1.9mA
• Digital Ic Case Style: DIP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Functional Description
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
words, if we apply an analog input equal to the center-value
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
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.
±
±
1
1
⁄
⁄
2
4
LSB from the ideal center-values. Each tread (the range
LSB, we guarantee that the A/D will produce the correct
Transfer Function
Transfer Function
1
⁄
2
LSB.
FIGURE 1. Clarifying the Error Specs of an A/D Converter
FIGURE 2. Clarifying the Error Specs of an A/D Converter
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±
1
⁄
4
Accuracy=
LSB. In other
Accuracy=
±
0 LSB: A Perfect A/D
17
±
1
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 +
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.
⁄
4
LSB
1
⁄
2
LSB because the digital code appeared
Error Plot
Error Plot
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1
⁄
2
LSB in