One of the features our devices have is beyond the supply. It allows them to pass a voltage signal below ground or above VDD.
There are three different types of beyond the supply operations:
- Negative signal operation
- Positive signal operation
- Negative and positive signal operation
Negative Signal Operation
A multiplexer with a beyond the supply feature and a negative signal capability can pass a signal below ground without distortion. Which is common in audio application. The TS5A22364 is an example of a device from our catalog that is capable of passing a negative voltage signal while being powered by a positive voltage supply.
Positive Signal Operation
For the positive signal case, it is very similar to the negative one. The device is capable of passing a signal higher than the supply it is being powered by. It is common in interface applications, where you may be connecting an offboard 5V interface to an onboard 3V interface. This is why these devices also commonly have power off protection. For example the TMUX1574 is a device that is capable of passing a signal up two times higher than its supply voltage.
Negative & Positive Signals Operations
For this case, the device is capable of both negative and positive signal operations. It can pass signals below ground and above VDD through the switch without distortion. This is common in both high-power audio, and applications with high voltage common mode offsets like factory automation. An example of such a device is the TMUX4827, which is capable of passing signals beyond the supply from -12 V to 12 V.
