SI8719BC-A-ISR

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Digital Isolators is a kind of device used to solve the problem of galvanic isolation of the device without affecting its performance. Compared with the traditional insulation method, the digital isolation based on cyclic redundancy (CR) or magnetic coupled transmission can achieve high reliability and low power consumption. SI8719BC-A-ISR is a specific model in digital isolator category, its application field and working principle will be introduced in this article.

SI8719BC-A-ISR is a Voltage-to-current sourcing isolator, which is widely used in data and signal transmission. It supports both single and dual-supply operations, providing a robust way for isolation of high voltage standard bus systems. Especially in safety sensitive applications such as Automotive, Medical Devices and Aerospace quality control, SI8719BC-A-ISR can be used to transmit signal and data without compromising safety. Low power consumption is another advantage of SI8719BC-A-ISR, creating a cost-effective solution for engineers and developers.

In order to understand the working principle of SI8719BC-A-ISR, let us first look at the block diagram. The device consists of two integrated circuits: a voltage-to-current source IC and a current-to-voltage receiver IC. When a voltage signal is input to the voltage-to-current source IC, it converts it to a regulated current signal and sends it through a high bandwidth isolating transformer to the current-to-voltage receiver IC. As no high voltages are involved, a small air gap between transformer has allowed to achieve the required galvanic isolation. The current-to-voltage receiver IC then converts the received current signal back to a voltage signal and outputs it.

SI8719BC-A-ISR has two isolated power supply pins that can provide power to both chips. The first one is the VIs_in pin which is connected to a 4.3 to 5.5v DC supply, and the second one is VIs_out which is isolated from the first one and connected to a 0.8 to 5.5v DC supply. The pins connected to the source and the receiver IC are also connected to a current-limit circuit which ensures that controlled voltage signals are transmitted. The typical open-loop current-to-voltage transfer gain is around 60 dB, making it very suitable for highly isolated applications.

In summary, SI8719BC-A-ISR is a low-cost digital isolator that provides proven galvanic isolation for customer devices. Its low-power consumption eliminates the need for additional power supplies, and its wide range of current-to-voltage transfer gains make it an ideal solution for applications where safety and high reliability is demanded. With its wide range of features and applications, SI8719BC-A-ISR is well-suited for a variety of digital isolation solutions.

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