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Digital Isolators

Digital Isolators are components designed to transfer digital signals between two electrical circuits while providing a very high electrical isolation barrier between them. Digital isolators can be used wherever galvanic isolation is desired between two electrical circuits. An example of this situation is in the automotive industry, where digital isolators can be used in power control systems and in Digital engine management systems. The IL712-3E is one example of a digital isolator.

IL712-3E Application Field & Working Principle

The IL712-3E is designed for low energy digital isolator applications such as microprocessor-based control systems, sensor networks and data acquisition systems. It uses a combination of high-voltage and optocoupler isolation technologies to provide a high level of isolation against signals up to 1700V peak. It is designed to transfer digital signals up to 66MHz with a maximum data rate of 33MHz.

The IL712-3E is also designed to provide a bidirectional digital coupling by using a combination of galvanic and electro-optical isolation techniques. An internal optical emitter and an array of photodetectors, plus electro-optical circuitry, make up the bidirectional information transfer pathway. The signal is sent from one end of the isolator and detected by the other end.

The IL712-3E uses electro-optical isolation to provide a virtually instantaneous physical barrier between the two systems it is connecting. As a result, any electrical noise which might cross between the two systems is blocked completely. This isolation helps maintain the integrity of the digital signal being transferred between the two systems.

The IL712-3E also uses an integrated FET input stage which can further reduce the system’s susceptibility to electromagnetic interference (EMI). This eliminates the need for external EMI protection circuitry and can dramatically reduce the size and cost of the system. The IL712-3E also utilizes a highly integrated power supply system with adjustable output voltages up to 28V.

The IL712-3E is available in a standard 8-DIP (Dual Inline Package) configuration with a power supply operating from a wide (+5V to +28V) supply voltage range. A wide selection of package sizes is also available including surface-mount SOT, QSB and QFN. The IL712-3E can be used in a variety of applications such as medical device control systems, motor drives and automation systems.

In conclusion, the IL712-3E is a cost-effective and reliable digital isolator solution for a variety of applications where the requirements for galvanic and electro-optical isolation are high. Its integrated FET input stage eliminates the need for external EMI protection circuitry, making it ideal for space-constrained applications. It is also available in a variety of package sizes for flexible design and integration into existing systems.

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