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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driving with a constant current provides more uniform illumination in cases
where that is important.
Figure 6.15 illustrates a method that can be used to drive multiple LEDs with a
single pull-up resistor. In this circuit, each LED is turned on one at a time (by
driving the corresponding port bit low), so the differing forward drops do not
cause a problem.
DACs
As discussed in Chapter 2, DACs convert a digital word to a corresponding analog
voltage (or current). A DAC is at the heart of most ADCs. Other applications for a
DAC range from controlling the reference to a voltage comparator to simulating a
sine wave. I used a DAC in an unusual application ...
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