AN795| Application Note
Maxim/Dallas > App Notes > VIDEO CIRCUITS Keywords: video crosspont switch, analog video switching, analog matrix, OSD, on screen display, integrated circuits, ICs
Feb 06, 2002
APPLICATION NOTE 795
Designing Large Video-Crosspoint Systems Just Got Easier
Maxim has raised the bar by announcing the next level of integrated video crosspoint integrated circuits (ICs). The flagship member of this new family is a fully buffered 32x16 analog crosspoint matrix, twice as large as the largest currently available. The switching portion alone is equivalent to 512 analog switches. The switching matrix is 100% non-blocking, which means any input can be connected to any output. usly. Each input and output is buffered and all outputs can be individually set for high impedance disbale or gain = 1V/V or 2V/V. Analog video switching constitutes the heart of many systems. It plays a pivotal role in security video, video on demand, and other equipment that captures or distributes multiple analog-video signals. Designing the circuit boards that switch these signals can be challenging, because the designer must account for impedance matching, return loss, tilt effects, clamp levels, differential gain and phase errors, glitch energy, and other important issues. A wrong decision in
any of these areas affects the resulting video quality. When designing a very large system that switches several hundred or several thousand video signals, you must also consider crosstalk, signal degradation, insertion loss, EMI, physical size, and excessive heat. The historic design approach based on passive switches and IC op amps is challenging even for seasoned analog-video engineers. Today's highly integrated video-crosspoint ICs, however, enable the designer to produce more reliable systems faster and with less effort. Because most of the system's complexity resides in the IC, the designer can develop smaller systems that yield higher performance and greater profit.
New, Integrated, Video Crosspoint Matrix
Maxim has raised the bar by announcing the next level of integrated crosspoint ICs. The flagship member of this new family is a fully buffered 32x16 crosspoint matrix, twice as large as the largest currently available. As the first devices to achieve this level of integration, the new ICs pack a 32x16 matrix and other useful functions in a 144-pin TQFP form factor (Figure 1). The switching portion alone is equivalent to 512 analog switches. The switching matrix is 100% non-blocking, which means any input can be connected to any output. You can also connect any input to any number of outputs or even to all outputs simultaneously.
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