Analog Switches

Technical Documentation

The portfolio of Analog Switches from onsemi includes DPDT, SPDT, SPST and other configurations. These devices function as analog multiplexers and demultiplexers, for audio, data, and signals.

Multiplexers and demultiplexers are essential components of an electronic device. They make sure the signals in the devices are transmitted smoothly. Analog and digital switches serve the same function, but they are primarily silicon-based and handle different frequencies of signals.

What is a Multiplexer?

Multiplexers are devices that have multiple inputs and only one output. Therefore, the multiplexer can receive numerous signals in one terminal and transfer them to a microprocessor. They are also known as data selectors. We have a wide range of multiplexers, from SPDT analog switches to Octal SPDT and Quad DPDT switches. The SPDT switches are smaller than the Octal SPDT and Quad DPDT switches. Our switches also come with low resistance, which means you'll get smooth transmission. Other features include 15kV diodes that protect the whole system and a negative charge pump essential for storing charge. They can also accommodate audio and USB needs, giving you a full range of uses.

The multiplexers are tiny, which is great if you want to carry them around. You can switch audio signals to either speakers or headphones. They are also capable of transmitting signals towards sensors. Furthermore, its ability to transmit high-speed signals makes the switch suitable for USB 2.0 applications. In simpler terms, a multiplexer allows many input signals to use one output, for example, an analog-to-digital converter.

What Is a Demultiplexer?

A demultiplexer works with a single input, and that input routes signals to several output lines. This means that a demultiplexer has one input and several outputs. It should, however, be noted that it routes signals to only one of the several output lines. It is also known as a data distributor. In this way then, the demultiplexer acts as a decoder. There are two types of demultiplexers:

  • 1 to 4 demultiplexer - This demultiplexer determines the output routed to the input by analyzing two select lines. It has four outputs and two inputs.
  • 1 to 2 demultiplexer - This demultiplexer uses only one line to determine the line routed to the input. It has only two outputs and one input.

Multiplexer vs. Demultiplexer

A multiplexer and a demultiplexer share many similarities and differences. For instance, both use combinational logic types, which means Boolean circuits implement them. However, one significant difference between the two is that the multiplexer collects data in digital form from various inputs into a singular source.

In contrast, the demultiplexer collects data from a single source into several outputs. For this reason, the multiplexer is known as the data selector, while the demultiplexer is the data distributor.

The multiplexer is a digital switch that is used at the transmitter end with multiple inputs, while a demultiplexer is a digital circuit that is used at the receiver end due to its singular input.

Analog Switch Versus Digital Switch ICs

Analog switch integrated chips conduct both analog and digital signals from the input to the output, while digital switches only transmit one type of signal into the input pin and to the output. When turned on, the digital switch also duplicates the logic level, which returns to its previous state. Both analog and digital switches are better than conventional mechanical switches since they are smaller than the latter, hence more portable.

Analog switches better isolate signals when off but transit both analog and digital when on. Conversely, a digital switch transmits only digital, whether on or off.

What to Consider When Selecting an Analog Switch

  • The supply voltage available to power the switch.
  • The maximum distortion that the switch is capable of handling.
  • Control signal levels for switching the analog switch.
  • Value of the amplitudes of the signal that will pass through the switch.
  • The number of supplies in the system.
  • The amount of time it takes the switch to actuate.
  • The resistance rating of the switch — the lower the number, the better.
  • Its ability to block signals whenever it is not on.
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