Basics of electronic Getting Started: Multi-channel selector switch (MUX)

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Multi-channel selector switch is commonly used in electronic design, mainly used in channel expansion, in some cases through the selection of multi-channel selector switch can greatly reduce the design cost and design difficulties.

1 What is the multi-channel selector switch multi-channel selector switch is also called a multi-channel selector, in the transmission of multi-channel data can be selected on a road or a certain number of routes are on the way to achieve the purpose of channel expansion or reuse.

2 multi-channel selector switch Common classification more common multi-channel selector switch has 4 choice 1, double 4 Choose 1, 8 Select 1 and so on. The diagram below shows the following diagram:


The multi-pass switch has an address selector, if it is 8, there are 3 address selectors, and if 4, there are 2 address selectors.

3 The necessity of a multi-channel selector switch is a simple example of the necessity of a multi-channel selector switch.

Companies need to develop a PT100 temperature collection products, requires 8 channels, can simultaneously collect eight PT100, as far as possible to control the cost of living. So there are two project groups to the scheme competition, respectively, group A and group B.

A schematic diagram of the design of a group is as follows:


Group B is designed with the following schematic diagram:

So the company did not hesitate to adopt the design of Group B, a group with 8 instrument op put AD623, light this 8 op put on hundred dollars, the design of Group B greatly reduced the design costs.

4 multi-Channel selector switch application examples below learn about CD4052 and CD4053 in the form of examples.
The CD4052 is a dual 4-choice 1 Multi-selector switch with two address selectors, with a truth table as follows:

From the truth table can be seen, inhibit for low-power chip work, address AB has 4 combinations of the form can control 4 channels of the pass.
When A=0,b=0, the X0 channel is selected, the Y0 channel is selected, the experimental results are as follows:


A=0,B=0,X0,Y0 Channel Selection
When A=1,b=1, the X3 channel is selected, the Y3 channel is selected, the experimental results are as follows:

A=1,b=1,x3,y3 Channel Selection

The CD4051 is a 8-choice 1 Multi-selector switch with three address selectors with the following truth table:

From the truth table can be seen, inhibit for low-power chip work, address ABC has 8 combinations of the form can control 8 channels of the pass.

When a=0,b=0,c= 0 o'clock, the No. 0 channel is selected, the results are as follows:

A=0,b=0,c=0,x0 Channel Selection
When A=1,b=1,c=0, the X3 channel is selected and the results are as follows:



A=1,b=1,c= 0,X3 Channel Selection

5 Precautions Note the following two points when using the multi-channel selector switch:
The multi-channel selector switch has a resistance at the conduction, the resistance is about 500-1000 ohms, and the supply voltage and temperature are related, so if the voltage signal, in order to eliminate the impact can be connected to the OP amp;
The multi-channel selector switch has a small current that is not suitable for use in large current situations.

The above is a simple explanation of the multi-channel selector switch, hoping to help you, for everyone to do similar circuit when making a reference.