LM1881M/NOPB

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LM1881M/NOPB is a video processing device that focuses on providing a reliable solution for switching composite video signals on and off. It is part of Linear’s Linear-Video Processing series, combining with other devices to achieve excellent video processing results. In this article, we will discuss the application field and working principle of the LM1881M/NOPB.

The LM1881M/NOPB is primarily used for switching composite video signals on and off in a variety of applications. Typically, it is used for synchronizing and controlling the synchronization pulses in a television system. The device can operate with both a vertical and horizontal sync pulse, allowing for optimal control of the video signal for synchronization and switching. Additionally, it is also used in professional video systems, such as broadcast systems, for responding to external control signals.

The main component of the LM1881M/NOPB is the monolithic integrated circuit. This component is designed to have an immunity of up to 30V peak between any video source and ground, providing superior noise / interference rejection. Its low bias input current also allows for reliable noise immunity, eliminating any unwanted signals that may be picked up by the circuit. The integrated circuit also contains an Advanced Schmitt Trigger (AST) circuit, which is designed to detect high-frequency video signals in order to turn off the video at the desired voltage.

The working principle of the LM1881M/NOPB is fairly straightforward. First, when the device is connected to a video source, the high frequency video signals are received and then processed through the AST circuit. This circuit then detects any of the high-frequency pulses and sends the signals to the output stage. When the high-frequency pulse is detected, the output stage will either turn the video on or off, depending on the type of switch that is set in the circuit. This type of switching is referred to as “On/Off” switching, and can be programmed using the external resistors that are connected to the input and output terminals of the integrated circuit.

In addition to the On/Off switching, the LM1881M/NOPB also has a Pulse Width Modulation feature. This feature allows the user to configure the device to switch the video on and off in a very specific and precise manner. The pulse width modulation feature is primarily used in applications that require exact timing and control of video signals, such as in video editing systems. The pulse width modulation feature is also useful for increasing the response time of the video switch, allowing the user to get a quicker response.

Overall, the LM1881M/NOPB is an excellent device for switching composite video signals on and off. It is part of Linear’s Linear-Video Processing series, combining with other devices to achieve excellent video processing results. With its noise / interference rejection and Pulse Width Modulation features, the LM1881M/NOPB provides reliable and precise control of video signals.

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