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SDI equalizer touts lowest jitter across cable lengths

Posted: 22 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:SDI equalizer? digital interface serial? jitter lowest?

LMH0384 SDI equalizer

National Semiconductor Corp. has released a PowerWise 3Gbit/s serial digital interface (SDI) cable equalizer (EQ) designed to simplify the design of broadcast video routers, production switchers, distribution amplifiers, editing and conversion equipment.

The LMH0384 claims to offer the lowest output alignment jitter across cable lengths, allowing hardware designers more headroom for designing within system jitter budgets.

The also LMH0384 guarantees less than 0.3 unit intervals (UI) of output jitter from zero to 110m of Belden 1694A coaxial cable at 2.97Gbit/s. It equalizes up to 140m of cable at 3Gbit/s rates, 200m at high-definition (HD) rates and 400m at standard-definition (SD) rates. The device adaptively adjusts equalization levels based on cable length to receive incoming signals and provide low-jitter transmission of 1080p HD broadcast video at up to 60fps over a single coaxial cable.

National's LMH0384 supports two modes of operation: pin mode and register mode. In pin mode, the EQ is fully backward-compatible with National's other SDI equalizers. Register mode opens up a suite of advanced featuresaccessible via SPI busthat enable flexibility to change and diagnose product parameters without requiring a board re-spin. These include automatic power down (auto-sleep), cable length indicator, LVDS drivers with programmable offset and amplitude and programmable input launch amplitude to facilitate operation with external splitters. The LMH0384's 1.05V to 1.85V adjustable output common-mode voltage eliminates the need for level-translation buffers by facilitating direct coupling to most FPGAs and signal conditioning devices.

In addition, the EQ offers active sensing features to minimize power consumption and reduce cooling requirements in customer systems. In the event of cable detachment or loss of signal, the LMH0384 enters a power-saving auto sleep mode to reduce power consumption by 85 percent. In active mode, the EQ automatically shifts equalization stages at shorter cable lengths (less than 140m) to reduce power consumption by 20 percent. The EQ typically consumes 230mW of power from a single 3.3V supply.

Offered in a 16-LLP package, the LMH0384 is priced at $21 each in 100-unit quantities. The LMH0384 is sampling now, with production quantities scheduled for May 2009.

- Ismini Scouras

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