Product category:
Analogue and Mixed Signal ICs
News Release from: Intersil | Subject: ISL59534
Edited by the Electronicstalk Editorial
Team on 25 September 2006
Crosspoint switch provides black-level
accuracy
Video crosspoint switch provides correctly balanced composite video with fewer external components.
The latest crosspoint switch from Intersil provides black-level accuracy in composite video Proper video levels yield better picture quality and Intersil's integrated DC-restore function on the chip reduces fluctuation while eliminating pictures that are too light or too dark
This article was originally published on Electronicstalk on 8 Jan 2001 at 8.00am (UK)
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The ISL59534 also eliminates the need for diodes, resistors and capacitors on each video input, resulting in cost and board space savings.
The 32x16 video crosspoint switch 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.
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The device adds to Intersil's expanding video crosspoint switch portfolio that now includes a 32x32 (ISL59532), a 32x16 (ISL59534) and a 16x16 (ISL59530) device.
All of these devices feature integrated DC-restore clamps for superior black-level consistency and are footprint compatible for increased designed flexibility.
The ISL59534 is ideal for routing video signals in security and video-on-demand systems.
The device operates from a single +5V supply.
It can accommodate voltages from 0 to 3.5V at the inputs and 0 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 ISL59534 features a -3dB signal bandwidth of 320MHz.
The device has a differential gain and differential phase of 0.025% 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 with other competitive solutions.
The device is part of Intersil's new line of video crosspoint switches that are footprint compatible with the company's industry-leading, single-chip 32x32 video crosspoint.
Customers can use the same board design for a variety of different applications and 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.
Target applications for the device are security camera switching, RGB routing, and HDTV routing.
The ISL59534 is available now in a 356-lead BGA package.
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