Quad Equalizer Lets You Go Faster And Longer With High-Speed Serial Channels

Nov. 5, 2007
When implementing systems using gigabit serial data transmissions in cables or in backplane transmission lines, you're very limited in the lengths you can achieve because of the severe attenuation and distortion. An established way to compe

When implementing systems using gigabit serial data transmissions in cables or in backplane transmission lines, you're very limited in the lengths you can achieve because of the severe attenuation and distortion. An established way to compensate is to use equalization at the receiver.

The equalizer anticipates the distortion and adds corrective measures that enable you to implement higher-speed interfaces over longer signal paths. Now, you can buy such equalizers for some standard serial interfaces that run as fast as 10 Gbits/s. For example, National Semiconductor's DS64EV400 programmable quad equalizer compensates for medium losses and reduces deterministic jitter for four data channels.

Part of National's PowerWise product portfolio, the chip consumes 94 mW per channel. With these equalizers, you can boost signal strength as much as 20 dB on up to 10 m of CAT5 cable or up to 40 in. of FR-4 pc-board backplane up to 6.4 Gbits/s and up to 30 in. for FR-4 at rates to 10 Gbits/s. Equalizer output has a low 0.175 UI (unit interval) of residual jitter.

The DS64EV400 is designed for use with FPGAs and ASICs in building systems using any of the high-speed buses like Fibre Channel and Ethernet/XAUI. Each equalizer channel has eight equalization levels that all can be set simultaneously by three control pins or individually programmed through a serial management bus (SMB) link.

The chip permits both ac and dc coupling to the data paths and can accommodate long run-length data patterns like PRBS-31 or balanced codes like 8B/10B. The DS64EV400 also uses differential currentmode logic (CML) I/O and is protected against electrostatic discharge (ESD).

The DS64EV400 is made with a proprietary silicon-germanium (SiGe) biCMOS process and comes in a 7- by 7-mm, 48-pin leadless leadframe package (LLP). Supply voltage may be 2.5 or 3.3 V. The DS32EV400 is available for data rates up to 3.2 Gbits/s. Pricing is $16 for the DS64EV400 and $13 for the DS32EV400 in 1000-unit lots.

National Semiconductor www.national.com

Sponsored Recommendations

Board-Mount DC/DC Converters in Medical Applications

March 27, 2024
AC/DC or board-mount DC/DC converters provide power for medical devices. This article explains why isolation might be needed and which safety standards apply.

Use Rugged Multiband Antennas to Solve the Mobile Connectivity Challenge

March 27, 2024
Selecting and using antennas for mobile applications requires attention to electrical, mechanical, and environmental characteristics: TE modules can help.

Out-of-the-box Cellular and Wi-Fi connectivity with AWS IoT ExpressLink

March 27, 2024
This demo shows how to enroll LTE-M and Wi-Fi evaluation boards with AWS IoT Core, set up a Connected Health Solution as well as AWS AT commands and AWS IoT ExpressLink security...

How to Quickly Leverage Bluetooth AoA and AoD for Indoor Logistics Tracking

March 27, 2024
Real-time asset tracking is an important aspect of Industry 4.0. Various technologies are available for deploying Real-Time Location.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!