National Semiconductor Introduces Broadcast Industry's First Configurable I/O With Integrated Return Loss Network

PowerWise LMH0387 Enables Bi-Directional Communication on Single BNC and Eliminates Complex External Return Loss Networks

SANTA CLARA, Calif., April 12 — (PRNewswire) — The industry's first configurable I/O chip for serial digital interface (SDI) broadcast video equipment from National Semiconductor Corp. (NYSE: NSM) simplifies design by providing manufacturers the flexibility to program their BNC interface connectors as either inputs (equalizer) or outputs (cable driver). The PowerWise® LMH0387 targets 3G/HD/SD video capture and editing cards that have a limited number of coax BNC connectors, as well as processing and distribution equipment that support a wide variety of I/O configurations.

Prior to the LMH0387's availability, SDI ports were fixed as inputs or outputs, requiring designers to build one card per I/O configuration. Equipment manufacturers had to bear the higher research and development and inventory holding costs of supporting multiple configurations. By providing a flexible I/O BNC interface, the LMH0387 reduces the number of unique I/O configurations and associated costs. In addition, the universal BNC interface allows manufacturers to program their equipment I/O configurations post-delivery during studio installation. For example, a compact router frame with 64 BNCs may be configured as a 32 by 32 matrix, a 1 to 63 distribution amplifier, or any other combination of inputs and outputs to meet the application's particular demand.

The LMH0387 is also the first solution to integrate the complex return loss network, to assure compliance to the Society of Motion Picture and Television Engineers (SMPTE) 424M return loss specification. The on-chip return loss network eliminates the time consuming and costly process of tweaking passive component values to achieve spec compliance. By integrating the network, the LMH0387 accelerates time-to-market, conserves board area, reduces bill of materials cost, and achieves greater than 5 dB of margin above the SMPTE specification.

Key Features – LMH0387 Triple-Rate SDI Configurable I/O

The LMH0387 uses the same I/O pin for both input and output functions, and operates over a wide range of data rates from 125 Mbps to 2.97 Gbps, supporting SMPTE 424M, SMPTE 292M, SMPTE 344M and SMPTE 259M specifications. The LMH0387 equalizes up to 120 meters of Belden 1694A coaxial cable at 3G rates, 200 meters at high-definition (HD) rates and 400 meters at standard-definition (SD) rates. The LMH0387 delivers 75 ps rise and fall time performance and power-down control in the output driver mode. In the input mode, the device offers a power-saving sleep mode, programmable output common-mode voltage and swing, cable length indication, launch amplitude optimization, input signal detection and an SPI-compatible serial interface.

Pricing and Availability

Available now, the LMH0387 is supplied in a space-saving 48-pin chip-scale package and is priced at $12.95 each in 1,000-unit quantities. For more information, or to order samples and an evaluation board, visit  

About National Semiconductor

National Semiconductor is a leader in analog power management technology. Its products include easy-to-use integrated circuits, PowerWise products that enable more energy-efficient systems, and SolarMagic products which improve the energy output of solar arrays. The company celebrated its 50th anniversary last May. Headquartered in Santa Clara, Calif., National reported sales of $1.46 billion for fiscal 2009. Additional information is available at

PowerWise is a registered trademark, and SolarMagic is a trademark of National Semiconductor Corporation.

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SOURCE National Semiconductor Corp.

National Semiconductor Corp.
Mark Alden of National Semiconductor Corp.
Phone: +1-408-721-6929
Email Contact

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