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Potentiometers are incredibly useful, whether you're controlling the volume
on your stereo or the 'mood lighting' in your room. The problem with
traditional potentiometers is the fact that your microcontroller doesn't have
an easy way to interface with them. Digital Potentiometers solve that problem
by allowing you to control a voltage splitter with digital signals.
Wire it up just like a potentiometer and use serial signals to 'turn the
knob.' Another handy feature of digital potentiometers is that because they
aren't controlled mechanically, they don't have a pre-determined sweep
profile.In other words, depending on the way you write your code the
potentiometer can 'sweep' in a linear fashion, a logarithmic fashion, or
according to any other profile you like. Digital potentiometers can also be
used in conjunction with rotary encoders to consolidate large banks of
potentiometers into one 'smart' rotary control.
The package of this IC is 8pin DIP.