Difference between Multiplexer and Decoder

Both the multiplexer and the decoder operate together to generate signal and data output for various communication and operating channels. Though multiplexers and decoders perform almost identical functions, they differ for a variety of reasons. Before moving into the difference between Multiplexer and Decoder, let’s first understand more about them.

What is Multiplexer ?

A multiplexer, also known as a MUX, is a device that selects one of several input signals and transmits it to a single output line. The technique that transmits various digital input signals, analog signals, or streams of data over a single channel is called multiplexing. The technique basically integrates various channels of low-speed into one high-speed one for the process of transmission.

Multiplexing technology includes FDM, a.k.a. Frequency Division Multiplexing, WDM, i.e., Wavelength Division Multiplexing, etc.

What is Decoder ?

Decoder is a logic circuit which n input lines into m output lines. Decoders are called as min-term and max-term generators because for each of the input combinations, exactly one output is true.

For example :2 to 4 binary decoder – This decoder has two binary inputs and four coded outputs. Binary decoders that may be cascaded together to produce a bigger decoder circuit are known as cascading decoders. By cascading two 2 input decoders, four input decoders can be produced. Similarly, a 4 to 16 binary decoder can be built by cascading two 3 to 8 decoders.

Difference between of Multiplexer and Decoder

Conclusion

In digital electronics, both Mux and decoder are very crucial concepts that serve different purpose. A Mux selects one input(1) from different input(n) whereas decoder takes binary input and converts it into unique output line and all the noticeable differences between multiplexer and decoder are enlisted in the above table.