DG408CJ+

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The DG408CJ+ device is an analog switch or multiplexer/demultiplexer integrated circuit from Analog Devices, Inc. It is one of the most widely used integrated circuits for switching and mux/demux applications. It is designed for low power applications and consists of an array of individually-controllable switches and buffers.

The device contains four controlled switches (each one of a kind), two bidirectional buffer amplifiers, and three logic buffers. All the elements are interconnected by a flexible architecture that allows the user to configure the switching array to work as a multiplexer, demultiplexer or both, depending on the application.

The DG408CJ+ device operates from a single-ended supply voltage of 4.5 V to 5.5 V and can be used for switching applications up to 25 MHz for frequencies between DC and 1 MHz. The switching speed is of 2 nanoseconds for all four switches and the on resistance is quite low at 1.5 ohms. The device also features tri-state outputs and logic-controlled outputs.

The DG408CJ+ device can be found in applications such as video switching, audio switching, analog signal routing, communication interface circuits, smart sensors, precision measurement applications and power management functions. This device is also useful in industrial, instrumentation, test and measurement, and instrumentation and control systems.

This device operates by using two sets of four FET switches that allow connections between the outputs and inputs of the circuit. A logic input, ST, selects which switches are activated and the direction of transmission, while the other input, CA, is used to control the enable/disable status of the switches. The enable/disable signal and the selection input, ST, are fed to a 4-antenna array. This 4-antenna array has four different configurations depending on the signal conveyed by the control input. A logic low input control signal will enable or disable the gate or the switch which enables the connection vehicle the outputs to the inputs.

The DG408CJ+ device is suitable for both automatic and manual switching applications. In the manual switching application, the user can turn on select channels from the switch array by applying a LOW signal to the appropriate CA input. The LOW signal enables the particular switch and connections between outputs and inputs are established. The CA input should always be applied with a low signal in order to control the enable/disable status of a particular switch.

The automatic switching is a bit different, as the user has to programmed the switching array to the desired configuration, like the multiplexer, demultiplexer or a combination of the two. This programming is done through a logic signal, ST. When the logic signal ST is applied, the circuits select the appropriate switch configuration according to the data conveyed by the ST signal. The connections between the input and output are established based on the switching configuration data.

In summary, the DG408CJ+ device is an analog switch or multiplexer/demultiplexer integrated circuit designed for low power and low frequency applications. This device enables connections between inputs and outputs based on the signal conveyed by the control and selection inputs. It is suitable for both manual and automatic switching and can be used in various applications like switching, audio switching, analog signal routing, communication interface circuits, power management functions and more.

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