SI8400AA-A-IS

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Digital Isolators

A digital isolator, also called an opto-isolator or optical isolator, is an electronic component that allows signals to be transmitted between two separate circuits and isolated from each other. The device\'s purpose is to protect each circuit from interference, power surges, or electrical noise in the other circuit. Digital isolators are especially useful for linking multiple circuits in a system, allowing data to be shared without the risk of damaging any of the linked systems.

SI8400AA-A-IS Application Field and Working Principle

The SI8400AA-A-IS digital isolator is a member of Silicon Laboratories’ family of digital isolators with an integrated low-power digital isolator solution. This ISO8200AA-A-IS provides galvanic isolation to 8 channels of data and 24 V of digital isolation, making it suitable for a variety of industrial systems and applications. This digital isolator is designed to reduce power consumption while maintaining the durability and reliability needed for industrial environments.

The SI8400AA-A-IS digital isolator\'s working principle is to utilize an optically coupled relay (OCR), which effectively isolates two distinct electrical circuits without the need to conduct the electrical signals between them. The integrated OCR in the SI8400AA-A-IS digital isolator consists of two separate LED-photodetector pairs connected in series on opposite sides of the isolator device. When triggered, the OCR lights up the LEDs and this causes the photodetector to sense the optical signal and drive the output.

In the SI8400AA-A-IS digital isolator, the optically coupled relay accepts up to 8 TTL compatible logic levels with a maximum input voltage of 24 V. This digital isolator maintains up to 250 Vrms of electrical isolation between the input and output, eliminating the potential for electrical interference between circuits. The voltage range of the SI8400AA-A-IS digital isolator can be adjusted between 5 V and 24 V to customize the device to the requirements of the specific application.

The SI8400AA-A-IS digital isolator also has advanced features like an internal slew rate control and adaptive frequency dithering to reduce power consumption. The internal slew rate control ensures that the output of the isolator follows a desired output slew rate. The adaptive frequency dithering feature modulates the signal frequency to reduce the power consumption even further but without the risk of interfering with the signal. Additionally, the isolator is designed to operate over a wide temperature range from -40°C to 85°C.

Overall, the SI8400AA-A-IS digital isolator is an ideal solution for industrial applications requiring data isolation. This device is perfect for a variety of applications including precision control, data logging, serial communication, and signal amplification. With its superior features and integrated OCR, it provides reliable, stable, and durable performance in harsh environments. The low power design and wide temperature range of the SI8400AA-A-IS make it an economical choice for various industrial systems.

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