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Quad equalizer aims at 8Gbit/s PCIe apps

Posted: 22 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:quad equalizer? storage area networking?

National Semiconductor Corp. has claimed the industry's first quad equalizer specifically designed for PCIe applications with up to 8Gbit/s data transmission rates. The device supports PCIe Gen1 (2.5Gbit/s), PCIe Gen2 (5Gbit/s) and PCIe Gen3 (8Gbit/s) data rates, with typical power consumption of only 100mW per channel.

The DS50EV401 provides high-speed signal transmission over backplanes and cables used in storage area networking (SAN), switch fabrics, communications infrastructure and ATE. Extending backplane and cable reach, the quad equalizer compensates for transmission medium losses, reducing deterministic jitter on four data transmission channels. It provides 20dB of receive boost to equalize up to 10m of PCIe cable or 40inches of FR-4 PCB at data transmission rates up to 5Gbit/s, with less than 0.2 unit intervals (UI) of residual jitter at the equalizer output.

The DS50EV401 equalizes up to 30inches of FR-4 at data rates up to 8Gbit/s, while maintaining the same jitter performance. Its power-to-speed ratio of 13mW per Gbit/s per channel, when used in 8Gbit/s applications, positions the DS50EV401 among National's PowerWise family of energy-efficient products.

The DS50EV401 also simplifies system integration. Its input signals can be AC or DC coupled to interface with a variety of ASIC and FPGAs. The device provides two equalization settings to reduce inter-symbol interference (ISI) generated by the interconnect media. One setting minimizes jitter for PCIe Gen 1 and PCIe Gen 2 data rates, while the other minimizes jitter for the anticipated PCIe Gen 3 data rates. The DS50EV401 supports PCIe link extensions with transmit idle and beacon signaling on a 1x, 2x and 4x lane basis. It uses differential current-mode logic (CML) inputs and outputs that feature 8kV of ESD protection.

The equalizer includes a loss-of-signal (LOS) detect for each channel; operates over the full -40C to 85C temperature range and requires a single supply voltage of 2.5V or 3.3V. National fabricates this signal-conditioning part on its high-performance SiGe BiCMOS-8 process technology, which provides high performance-to-power ratios for high-speed interface devices.

Pricing starts at $9.90 each in quantities of 1,000. Available now, the DS50EV401 is offered in a 7mm x 7mm, 48-pin leadless LLP package.

- Gina Roos

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