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Digital Isolators

Digital isolators are silicon-based photonic isolation devices used in protection and control systems, including programmable logic controllers (PLCs), variable frequency drives (VFDs), Human Machine Interfaces (HMIs), and remote I/O networks. In these applications, digital isolators serve as an electronic barrier between a power supply and a logic circuit, preventing the two from interfering with each other. This article will discuss the application field and working principle of ADUM1201BRZ-RL7, a type of digital isolator.

Application Field

ADUM1201BRZ-RL7 is a digital isolator that can be used in various types of protection and control systems, including PLCs, VFDs, HMIs, and remote I/O networks. It is widely used in a variety of industrial, medical, automotive, and aerospace applications, as well as in home automation systems.

ADUM1201BRZ-RL7 is especially useful in applications that require galvanic isolation. It is also suitable for applications that require a long-term, stable signal transmission. With its wide common-mode and differential-mode surge protection, it is also ideally suited for applications that require data signal protection in noisy environments.

Working Principle

ADUM1201BRZ-RL7 uses a silicon photonic-based design to achieve galvanic isolation. This design allows the isolator to transfer data signals between two isolatable domains without allowing the two domains to interfere with each other. The device uses an LED and a silicon6 photodiode to bridge the gap between its two input and output pins.

When an input signal is applied to the isolator\'s input pin, the LED emits light, which is then detected by the silicon photodiode. This causes a voltage to be generated across the diode. This generated voltage is used to drive the output pin, thereby creating an isolated output signal.

In addition to its basic operational principals, the ADUM1201BRZ-RL7 also features two added isolation channels that can be used to improve the isolator\'s overall performance. These channels are the common-mode and the differential-mode surge protection channels. The common-mode surge protection channel helps protect the device from transients or surges, while the differential-mode surge protection channel helps to prevent data signal loss due to electromagnetic interference.

Conclusion

ADUM1201BRZ-RL7 is a versatile, silicon photonic-based digital isolator that can be used in a variety of protection and control systems, including PLCs, VFDs, HMIs, and remote I/O networks. It is especially useful for applications that require galvanic isolation, as well as applications that require long-term, stable signal transmission. Additionally, the device features two added isolation channels, which further improve its performance and reliability in noisy environments.

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