Intersil introduced a 32x16 video crosspoint switch. The ISL59534 integrates a DC-restore clamp on each video input to eliminate black-level fluctuation, providing correctly balanced composite video with fewer external components. The DC-restore clamp biases composite (NTSC and PAL) video by automatically adjusting the DC level of the most negative portion of the video to the reference voltage. This feature can be disabled by the user through an SPI/QSPI compatible, three-wire serial interface for S-video and component video applications. The device is usefull for routing video signals in security and video-on-demand systems. This device operates from a single +5V supply. It can accommodate voltages from 0V to 3.5V at the inputs and 0V to 4V at the outputs. It also has an input clamp with external group reference that can be used for AC-coupled applications. Any of the ISL59534's outputs can be switched to any of the 32 input video signal sources. The device also features a broadcast mode in which any single input can be simultaneously sent to all 16 outputs.
With 90MHz of bandwidth in broadcast mode, the ISL59534 is well suited for security applications. Outputs can be individually programmed to high impedance and a gain of +1 or +2 for greater flexibility. The chip features a -3dB signal bandwidth of 320MHz. The device has a differential gain and differential phase of 0.025 percent and 0.022 degrees and 0.1dB flatness out to 50MHz. This performance supports increasingly higher video resolutions and provides superior isolation for less leakage between video channels. The device also has a large output current for driving multiple video loads. Each output of the ISL59534 can be put into a high impedance state so that several outputs can be connected together enabling much larger video matrices without adding rows of buffers.
The ISL59534 offers an integrated fast OSD (on-screen display) switch in each output to enable users to switch in other graphics -- such as the location of the camera providing the video feed -- into the video signal. OSD information can be inserted into any output through an internal, dedicated, fast 2:1 mux (15ns switching times) located before the output buffer. Intersil's OSD switch performs at speeds necessary for "glitchless OSD," or video signal switching without any noticeable smudging. The integration of OSD switch further reduces the BOM when compared to other competitive solutions. This device is part of Intersil's line of video crosspoint switches that are footprint compatible with our industry-leading, single-chip 32x32 video crosspoint. Customers can use the same board design for a variety of different applications.
