December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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However, the result is dependent on the value of the 5 V supply. If the supply
voltage is high by 1%, it has a value of 5.05 V. Now the value of the A/D conver-
sion will be:
3:2V 256
5:05 V
¼ 162
10
¼ A2
16
So a 1% change in the supply voltage causes the conversion result to change
by one count. Typical power supplies can vary by 2 or 3%, so power supply
variations can have a significant effect on the results. The power supply output
can vary with loading, temperature, AC input variations, and from one supply to
the next.
This brings up an issue that affects all ADC designs: the accuracy of the reference.
The Maxim MAX1242, which we have already looked
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