FOD852

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Optoisolators are used to provide galvanic isolation between two circuits while allowing a digital communication signal to pass between them. This isolation prevents any interference from either side of the link and also protects the circuitry from any electrical spikes from either side. One of the optoisolator types, the FOD852, is designed for use as a high-speed isolator for logic signals in the range between 0 and 7V.

The FOD852 optoisolator consists of a traditional light-emitting diode (LED) which emits light onto a photodetector, such as a phototransistor, photodiode or photovoltaic cell. The LED used in this application is typically faster than a normal LED due to its higher speed in response time. The photodetector is the component used to sense the light emitted by the LED and produce a corresponding electrical output.

The device\'s working principle is rather simple. When a signal is applied to the LED from the input of the circuit, the LED emits light and the light is sensed by the photodetector in the output block. The photodetector then produces an electrical signal that is "translated" to the corresponding electrical signal from the input side. This electrical signal is then sent to the output side to complete the circuit.

The FOD852 optoisolator typically has an open-collector output which means that the output voltage is only held up when the signal from the input side is present. When there is no input signal present, the output voltage goes to 0V.

In addition to providing galvanic isolation, optoisolators can also be used for voltage level translation, as the electrical signal from the input side of the circuit can be translated into an output voltage that is different from the input voltage. For example, a 3.3V input signal can be translated to 5V output using an optoisolator. This is sometimes necessary to interface between two different digital voltage levels.

The primary applications of the FOD852 optoisolator are in the fields of industrial automation, communication systems, and data processing. In industrial automation, this device can be used to ensure isolation between a controller, such as a PLC, and other components such as valves, pumps, sensors, and motors. The FOD852 can also be used in communication systems to isolate digital signals from an Ethernet or CAN bus to prevent any interference between devices. Lastly, this device can also be used in data processing systems to provide isolation between devices such as CRT monitors and video cards.

Overall, the FOD852 optoisolator is an ideal device for providing galvanic isolation and voltage level translations in digital communication systems. It is designed for use as a high-speed isolated logic signal isolator for signals between 0 and 7V. This device is mainly used in industrial automation, communication systems, and data processing.

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