Video crosspoint switch reduces external components

13th September 2006

ES Admin

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Intersil’s ISL59530 16x16 video crosspoint switch integrates a DC-restore clamp on each video input, achieving consistent black-level accuracy throughout all regions of composite video signals with fewer external components. The device maintains proper video levels for better picture quality, and integrating DC-restore on the chip allows for less fluctuation, eliminating pictures that are too dark or too light. It also results in cost and board space savings.

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 VREF. This feature can be disabled by the user through an SPI/QSPITM compatible, three-wire serial interface for S-video and component video applications.
The ISL59530’s 16 video inputs and 16 video outputs are non-blocking, allowing users to route any of the input signals to any of the outputs. The device also features a broadcast mode in which any single input can be simultaneously sent to all outputs. With 150MHz of bandwidth in broadcast mode, the ISL59530 is well suited for KVM (keyboard, video and mouse) applications. Outputs can be individually programmed to gains of +1 or +2 for greater flexibility.

The ISL59530 features a -3dB signal bandwidth of 300MHz and a 6MHz signal crosstalk of -90dB. This performance accommodates increasingly high video resolution and provides superior isolation and less leakage between video channels. The device also has a large output current for driving multiple video loads. Each output of the ISL59530 can be put into a high impedance state so that several outputs can be connected together, enabling much larger video matrixes without adding rows of buffers.
The device 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. 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 new line of video crosspoint switches that are footprint compatible with Intersil’s industry-leading, single-chip 32x32 video crosspoint switch. Customers can use the same board design for a variety of different applications and then choose the Intersil crosspoint that best fits their input and output requirements. This gives customers additional flexibility and reduces the need for unique board designs for different applications.