DG442ETE+

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Analog switches, multiplexers and demultiplexers are all important components of any electronic system. In particular, the DG442ETE+ is a great example of an interface component that offers a wide variety of features and options. In this article, we take a look at the application field and working principle of the DG442ETE+.

Application Field

The DG442ETE+ is a monolithic, low-voltage, quad SPST (spill-off transistor) analog switch that can be used for a wide range of applications. It is suitable for switching analog signals such as audio signals, for example. It has low equivalent off-resistance, good linearity and high signal-to-noise ratio. It is also suitable for power switching, as it can handle up to 10V and is designed to be used in multiplex applications.

The main parameters of the DG442ETE+ include the low on-resistance (Ron) of 0.45Ω, the low off-resistance (Roff) of 0.2Ω, the low equivalent on-resistance (Reqon) of 0.9Ω and the low equivalent off-resistance (Reqoff) of 0.3Ω. The maximum operating voltage is 10V and the maximum current handled is 25mA. The DG442ETE+ can be controlled by an external voltage, by a TTL compatible logic signal or by an open-collector/pulldown input. It also includes protection features such as thermal shutdown and overtemperature protection.

Working Principle

The DG442ETE+ is designed to offer low insertion loss and low distortion behavior. It works by using four SPST (spill-off transistor) analog switches, each one formed by a PNP transistor and a depletion MOSFET. The PNP transistor is used as the pull-up element and the MOSFET is used as the pull-down element. When the control voltage or logic signal is high, the PNP transistor will be on and the switch will be closed, allowing an analog signal to pass through. When the control voltage or logic signal is low, the PNP transistor will be off and the MOSFET will be on, blocking an analog signal from going through. This switching action is how the DG442ETE+ operates.

The DG442ETE+ also includes protection features. First, it has thermal shutdown, which is when the chip shuts off when the temperature of the chip exceeds its safe operating temperature range. The overtemperature protection also helps to prevent the chip from becoming damaged if it is exposed to too much heat. Additionally, the DG442ETE+ has a power-down capability which can be used to reduce power consumption in applications where the switch is not used for extended periods of time.

Conclusion

The DG442ETE+ is an excellent example of a monolithic, low-voltage, quad SPST analog switch that can be used for a wide range of applications. It features low equivalent off-resistance, good linearity and high signal-to-noise ratio, as well as protection features such as thermal shutdown and overtemperature protection. Thanks to its low on-resistance, low off-resistance, low equivalent on-resistance, low equivalent off-resistance, maximum operating voltage of 10V and maximum current of 25mA, the DG442ETE+ is a great choice for switching analog signals and for power switching in multiplex applications.

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