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Video driver eliminates external caps

Posted: 05 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:video driver? driver? intersil? isl59830?

A triple video driver from Intersil Corp. is said to run off a single 3.3V supply, and it generates a negative voltage internally, removing the need for external coupling capacitors.

Video drive architectures typically use one of two coupling schemes: AC or DC. A system using AC coupling requires large external capacitors, but does not need a negative supply rail. A system using DC coupling does not need these large capacitors, but requires a negative supply rail.

The ISL59830 gives a designer the best of both schemes by generating the negative supply on chip and allowing DC coupling of the video signal, said Sameer Vuyyuru, Intersil's director for high-speed analog. This device is suited for applications driving RGB or YPbPr video signals.

"The video driver is often the only product in a design that still requires a negative supply rail where DC accuracy is required. Our product has made it possible to completely remove the higher cost of the negative supply rail and maintain DC accuracy," Vuyyuru said.

The ISL59830 features 6dB gain for all three channels and can drive doubly terminated 75 ohm loads. The device also has a voltage reference pin that allows the user to level shift the signal above or below ground to match an external reference.

Available in a 16-lead QSOP lead-free finish (RoHS compliant), the ISL59830 has a suggested pricing of $1.88 each in 1,000-unit quantities.

- Bettyann Liotta


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