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Enable Video Transmission Via Long Cables (MAX435)

2016-09-11 22:50  
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This article describes the Enable Video Transmission Via Long Cables (MAX435). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:MAX435.

This circuit enables you to connect your camera with very long wire. The circuit is actually a video amplifiers. At the sender part, the amplifier is used to make a stronger signal. This stronger video signal then can be transmitted through the long cables. The signal is transmitted using balanced mode, where two wires are driven in the opposite phase. Here is the schematic diagram of the circuit:

video wire circuit circuit schematic

The resistance of a typical four conductor flat 28 gauge telephone wire is about 7 ohms per 100 feet. Since voltage drops appear in both the plus and minus power supply leads, the total series resistance is about 14 ohms per 100 feet. Maximum allowable wire length depends on the total current requirements of the camera and send board. Using a camera that draws 100 ma, for example, a total current of about? 180 ma is required and therefore a maximum of approximately 500 feet of? 28 gauge flat telephone wire can be used. If a longer wire is needed, the round type of? 22 gauge four conductor telephone wire offers much lower resistance. Its resistance per 100 feet is approximately 3.3 ohms total for both the positive and negative power wires. Using this wire and a 100 ma camera, the wire length can be approximately 2000 feet.



The core of this circuit is the MAX435 transconductance? amplifier. Their wide bandwidth feature is suitable for video signal application. The balanced mode used in this video wire circuit make sure that any noise exsposing the cables would cancel each other at the receiver.


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