MAX440 Chinese Documentation In broadcasting, television, multimedia teaching and other systems, video switchers are often needed. The author designed a video switcher using the video multiplexing chip MAX440 and a microcomputer. Practical use has proved that the device performance-price comparator can achieve the desired effect. MAX440 is an 8-channel video high-speed multiplexing chip produced by MAXIM. Its switching time is 15ns and it is a CMOS integrated circuit. Its pin arrangement is shown in Figure 1 and its functions are listed in Table 1. Figure 2 shows the internal functional block diagram of MAX440 and the external matching circuit. It consists of a multi-way switch and an operational amplifier.
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