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ADC0800 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
ADC0800 8-Bit A/D converter National-Semiconductor
National ->Texas Instruments National-Semiconductor
ADC0800 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Typical Applications (Continued)
The digital output LED display can be decoded by dividing
the 8 bits into the 4 most significant bits and 4 least signifi-
cant bits Table I shows the fractional binary equivalent of
these two 8-bit groups By adding the decoded voltages
which are obtained from the column ‘‘Input Voltage Value
with a 10 240 VREF’’ of both the MS and LS groups the
value of the digital display can be determined For example
for an output LED display of ‘‘1011 0110’’ or ‘‘B6’’ (in hex)
the voltage values from the table are 7 04 a 0 24 or
7 280 VDC These voltage values represent the center val-
ues of a perfect A D converter The input voltage has to
change by g LSB (g20 mV) the ‘‘quantization uncertain-
ty’’ of an A D to obtain an output digital code change The
effects of this quantization error have to be accounted for in
the interpretation of the test results A plot of this natural
error source is shown in Figure 5 where for clarity both the
analog input voltage and the error voltage are normalized to
LSBs
TABLE I DECODING THE DIGITAL OUTPUT LEDs
HEX
BINARY
FRACTIONAL BINARY VALUE FOR
MS GROUP
LS GROUP
INPUT VOLTAGE
VALUE WITH
10 24 VREF
MS GROUP LS GROUP
F 1111
15 16
15 256
E 1110
78
7 128
D 1101
13 16
13 256
C 1100
34
3 64
B 1011
11 16
11 256
A 1010
58
5 128
9 1001
9 16
9 256
8 1 0 0 0 12
1 32
7 0111
7 16
7 256
6 0110
38
3 128
5 0101
5 16
5 256
4 0100
14
1 64
3 0011
3 16
3 256
2 0010
18
1 128
1 0001
1 16
1 256
0 0000
9 600
8 960
8 320
7 680
7 040
6 400
5 760
5 120
4 480
3 840
3 200
2 560
1 920
1 280
0 640
0
0 600
0 560
0 520
0 480
0 440
0 400
0 360
0 320
0 280
0 240
0 200
0 160
0 120
0 080
0 040
0
TL H 5670 – 8
FIGURE 5 Error Plot of a Perfect A D Showing Effects of Quantization Error
8
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