HCPL-7721-020

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Introduction

HCPL-7721-020 is an integrated optoisolator with a logic output intended for high speed switching and signal transmission. It is one of the most widely used optically isolated devices in modern application fields, mainly for isolating control circuits and logic inputs. The HCPL-7721-020 is also designed to meet the needs for high-speed data transmission, such as over a network or between different devices.

Application Fields

The main application fields of HCPL-7721-020, similar to the other optoisolators, are digital and communication systems. In digital systems, the optoisolator is used for isolating the logic inputs in order to protect sensitive parts of the system from sudden changes in the input, while facilitating high-speed data transmission. It’s also used for isolating control circuits, setting the logic states of the devices, signaling between different parts of a digital system, and balancing of clock-phase difference in clock synchronizing digital circuits. On the other hand, in communication systems, the optoisolator is used for isolating and driving headphone circuits, data transmission and reception, and signal transmission between two isolated networks.

Working Principle

The HCPL-7721-020 employs the familiar optical coupling principle—light emitted from an LED passes through a light barrier to a photosensitive receiver—for isolating two circuits. In this device, the LED is connected to the logic input side and the photodiode to the logic output side, with the light barrier in between. When a logic-level voltage is applied to the input side, the LED will turn on, emitting light that is directed to the photodiode. The light, when passing through the light barrier, will cause a voltage to be generated in the photodiode, driving the output side of the optoisolator to the corresponding logic state. In this way, the two circuits are electrically isolated from each other with the physical separation of the LED and the photodiode.

Conclusion

The HCPL-7721-020 optoisolator is an integrated device designed for isolated control circuits and logic inputs. It is widely used in digital and communication systems for a variety of applications, such as isolating control circuits, setting logic states of devices, and signal transmission between two isolated networks. The working principle of the device is based on optical coupling, employing an LED and a photodiode to ensure the electrical isolation of the two circuits while the logic signals are still passed through.

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