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Passive equalizer doubles data transmission reach on FR-4

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

Keywords:FR-4 backplanes? passive equalizers? HDMI cable? data transmission?

National Semiconductor Corp. has introduced two power-saver passive equalizers that double the data transmission reach of FR-4 backplanes. The DS38EP100 can equalize 40-inches of FR-4 PCB at a data transmission rate of 3.125Gbps, which is twice the reach of other passive equalizers and the DS80EP100 can equalize 20-inches of FR-4 at 10Gbps.

In addition to doubling the reach of FR-4, the DS38EP100 can equalize up to 5m of 28 AWG HDMI cable at a data rate of 3.4Gbps. It features 7dB of maximum boost and its I/O impedance is 100. The DS38EP100 supports all data coding techniques such as 8b/10b and scrambled signals. DS80EP100 offers similar technical features and can equalize 5m of 26 AWG cable. Both equalizers operate over the full -40C to 85C temperature range.

The DS38EP100 operates from 1Gbps to 5Gbps, while the DS80EP100 operates from 5Gbps to 10Gbps. They address a variety of systems using HDMI or DVI interface standards, as well as systems using a PCIe or XAUI interface.

Since the DS38EP100 and DS80EP100 do not require power or ground routing, system designers can place these equalizers in cables, connectors or backplanes with a minimum of layout changes. They can also cascade these devices with an active equalizer or limiting amplifier to further extend FR-4 and cable transmission links.

The passive equalizers accept any high-speed differential signal technology including current-mode logic (CML), LVDS and low-voltage positive emitter coupled logic (LVPECL). They are bidirectional, offering the same equalization gain in either direction.

The DS38EP100 and DS80EP100 may be used in a variety of applications including routers, storage subsystems and wireless base stations. They are supplied in a 6-pin LLP package for use in space- and layout-constrained systems such as cables or connectors in medical, security and industrial imaging systems.

Available now, the DS38EP100 is priced at $1.30 each and the DS80EP100 is priced at $1.60 each, both in quantities of 1,000.

- Gina Roos

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