SI8440AB-D-IS1R

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Digital Isolators are an important class of integrated circuits (ICs) used in a wide variety of applications, including communications, industrial automation, automotive, medical, and lighting. The SI8440AB-D-IS1R is a digital isolator developed by Silicon Labs, and it’s widely used in these applications. This article will explain the application fields and the working principle of the SI8440AB-D-IS1R.

The SI8440AB-D-IS1R is a full-featured and robust isolator designed to provide galvanic isolation in industrial systems. It is specifically designed for applications that require high levels of accuracy, noise immunity, and reliability, offering isolated digital signal transmission across different power domains. It couples digital signals between two power domains while transferring data bi-directionally. The isolation voltage of this device ranges between 5000 Vrms and 30000 Vrms, making it great for industrial applications, such as motor control, driver stage, or signal conditioning. It operates with 2.5, 3.3 and 5 V supply voltages, and can transfer data rates of up to 100 Mbps.

The SI8440AB-D-IS1R is a two-channel Isolator IC, featuring one side-channel for each signal. It consists of two separate ICs, one on each of the two sides, joined by an optical-isolation barrier. The side-channel on one side transmits data to the side-channel on the other side, which then transfers it to the other IC. In this way, the two ICs are basically “electrically isolated” from each other, meaning that there is no direct electrical connection between them. In addition to the two ICs, the device also includes a back-channel for unidirectional data transfer.

The working principle of the SI8440AB-D-IS1R is based on an optically isolated barrier, which is a thin film that allows the isolation of signals due to their different refractive indices. This is solved by adding an optical-isolation film on the input side of the device which causes the signals to be converted to different wavelengths of light, thus allowing the transmission without a direct electrical connection. On the output side, a detector is used to detect the light waves and convert them back to electrical signals. This mechanism of data transmission makes it possible to transfer both digital and analog signals between different power domains without the need for ground loops.

In conclusion, the SI8440AB-D-IS1R is an important digital isolator IC used in many applications, especially in industrial systems. It can transmit data bi-directionally across different power domains and features an optically isolated barrier to provide high levels of accuracy, noise immunity and reliability.

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