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Crosspoint switch promises high signal integrity

Posted: 06 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:crosspoint switches? 90nm? signal integrity? backplanes?


National Semiconductor Corp. has added two low-power, low-voltage differential signaling (LVDS) 2 x 2 crosspoint switches to its PowerWise energy-efficient product family.

The DS25CP102 is said to deliver the industry's best jitter performance (6ps typical) at data transmission rates up to 3.125Gbit/s, while consuming only 125mW of power per channel. The device features selectable transmit pre-emphasis and receive equalization to extend signal transmission reach in cables and FR-4 backplanes. The lower-speed (1.5Gbit/s) DS10CP152 addresses short-haul applications that do not require signal conditioning. It delivers excellent jitter performance (9ps typical), with very low power consumption of 57mW per channel.

The DS25CP102 and DS10CP152 work as splitters or muxes for high-speed signal routing and switching in OC-48 telecom as well as standard-definition (SD), high-definition (HD) and 3Gbit/s serial digital interface (SDI) professional video applications. They are also used in video and imaging transport applications to select between two data streams or as a splitter to drive two monitors. Their superior jitter and signal conditioning performance allow OEMs to use less costly cable, connectors and components. National built these 2 x 2 crosspoint switches with its proprietary SiGe BiCMOS-8 process technology, which provides the highest performance-to-power ratios for high-speed interface devices.

National's 2x2 crosspoints offer pin-selectable signal-conditioning features to reduce data-dependent jitter and eliminate the need for repeaters to extend signal transmission reach. Their inputs have a wide common-mode voltage range that allow the crosspoints to accept LVPECL, CML and LVDS signal levels without using coupling capacitors. The DS25CP102 and DS10CP152 accept signals directly from the leading 90nm and 65nm FPGAs and ASICs. They feature 8kV ESD protection and 100 termination on the LVDS I/O pins to minimize insertion losses, component count and board space.

Available now, the DS25CP102 (3.125Gbit/s) is supplied in a space-saving 16-pin LLP package and the lower power DS10CP152 (1.5Gbit/s) is supplied in a 16-pin narrow SOIC package. The DS25CP102 is priced at $5.25 and the DS10CP152 is $3.65, each in 1,000-unit quantities.

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