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What exactly is the difference between an Analog IC and a Digital IC?

I have to make a project at the university and I would like to know whether IC LM 3915 is analog or digital? I'd also like to know the difference between the two types of IC's.

UziMonkey8 years ago
The big difference is inputs and outputs. Digital ICs expect high/low true/false inputs and outputs. Analog ICs take any inputs, and produce outputs of any level. For example, an audio amplifier is an analog IC. It takes an analog input (sound), and produces an analog output (louder sound). A ripple counter is an example of a digital IC. It takes a digital input (clock pulses), and produces a number of digital outputs (the digital outputs of the flip flops, collectively representing a number in binary).
mictester8 years ago
The real difference is in application - analogue ICs are amplifiers, filters and so on. They are designed to handle and process analogue signals (speech, music, TV pictures, temperature information and so on). Digital ICs only cope with logic states - either high or low (digital 0 or 1) inputs, and output 1s and 0s. They're designed to perform mathematical operations, and were originally designed to be used in early computers. Examples would include AND, OR, NOT, EX-OR, and ADDER ICs - each has its own mathematical function