SI8422AB-D-ISR

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Digital isolators are typically used to efficiently pass data signals between circuits without allowing the two circuits to interact with each other. Of the various digital isolation options on the market, the SILabs SI8422AB-D-ISR is one of the most advanced. Its comprehensive range of features makes it a popular choice for engineers who require robust isolators for their circuit designs.

SI8422AB-D-ISR Application Field

The SI8422AB-D-ISR digital isolator is highly versatile, making it an ideal choice for a wide range of applications. Its differential inputs and independent outputs can be used to isolate system components such as processors, sensors, motor drives, and actuators. It is also suitable for isolating the digital peripherals of industrial controllers in automation systems.

The SI8422AB-D-ISR can be used for traditional applications such as RS232 and CANbus isolation, but its unique features make it especially suited for more advanced applications. It is the first isolator with integrated common mode transient immunity according to the IEC 61000-4-4 (surge) and IEC 61000-4-5 (burst) standards, making it highly effective at protecting circuits from electromagnetic and electrical noise.

SI8422AB-D-ISR Working Principle

The SI8422AB-D-ISR works to provide galvanic isolation between two circuits. It does this by employing an integrated magnetic circuit with a transmitting and receiving coil. This is the same principle employed by transformers to transfer power from one circuit to the next, however unlike transformers the SI8422AB-D-ISR transfers digital signals instead of power. The signal is converted into a stream of voltage pulses using the transmitting coil, which are then passed through the magnetic field generated by the receiving coil and converted back into the digital signal.

The SI8422AB-D-ISR offers a range of features to ensure reliable transmission. These features include a ripple-reducing capacitor, voltage protection, under-voltage lockout, hysteresis, and an integrated RC circuit. All of these features help to improve system performance while ensuring the signal is accurately transmitted from one circuit to the other.

Conclusion

The SI8422AB-D-ISR digital isolator by SILabs is a versatile and reliable option for engineers who require digital isolation in their applications. Its wide range of features, including integrated common mode transient immunity, make it an ideal choice for applications such as motor drive isolation, CANbus isolation, and digital peripheral isolation.

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