Santa Clara, Calif.Aimed at professional broadcast video applications, National Semiconductor Corp. launched six serial digital interface (SDI) products that are optimized to perform to Society of Motion Picture and Television Engineers (SMPTE) standards requiring ultra-clean, low-jitter signal transmission.
The products are claimed to represent industry firsts, including the smallest and lowest power high-definition/standard definition (HD/SD) reclocker, the first dual HD/SD cable driver and the lowest jitter HD/SD multi-rate serializer. Since they are multi-rate parts, they operate at both the SD and HD rates, which are 270-Mbits/s and 1.485-Gbits/s, respectively.
"What these chipsets enable is near loss-less video signal transmission across long distances of cable," said Michael Hendricks, Technical Marketing Engineer Interface Group, National Semiconductor. "Through uncompressed video transmission, there is signal degradation traveling over the cable. Our chipsets resurrect or reconstruct the signal to its original integrity."
The LMH0046 is a 3.3-V HD/SD reclocker that automatically detects and re-times the incoming data stream to suppress accumulated jitter. It is packaged in a 20-pin TSSOP that employs exposed die attached pad (DAP) technology for electrical ground connection and added thermal protection. It features dual-differential reclocked outputs and an optional low-jitter data-rate clock, as well a a single 27-MHz reference and externally terminated inputs that allow for much smaller AC coupling capacitors.
"One of the flagship products that we're announcing is the HD/SD reclocker, the LMH0046. That product runs at about half the power and about the third of the size of competitive parts. It runs at 300-milliwatts, typically from a 3.3-V supply," he said.
The products are suitable for routers where lined up next to one another are multiple reclockers, which consume a lot of power and dissipate a lot of heat. By reducing the power to nearly half, the system does not need fans. With fewer fans and smaller board size, the cost is also reduced.
Additional features include 0.6 unit interval minimum jitter tolerance, lock detect, manual rate select, LVPECL serial inputs and outputs, auto/manual bypass, and an output mute function for data and clock.
The LMH0202 dual HD/SD multi-rate cable driver accepts either two independent differential inputs or a single externally routed input. Packaged in a 16-pin TSSOP, the LMH0202 consumes approximately the same board area as a single cable driver in an 8-pin SOIC package. By replacing two single cable drivers with one LMH0202, designers can reduce chip count, conserve board area, shorten trace lengths and lower system cost.
From a 3.3-V supply, the LMH0202 consumes 250-mW of power in SD mode and 298-mW in HD mode.
National also expanded its adaptive cable equalizer family with two SMPTE-compliant equalizers. The LMH0024 SD adaptive cable equalizer offers 25 percent lower power consumption than competitors’ products, according to National. Packaged in a 16-pin SOIC, the LMH0024 supports SMPTE 259M/344M standards and consumes 198-mW typical power from a single 3.3-V supply.
The LMH0044 is a multi-rate SMPTE 292M/259M adaptive cable equalizer in a tiny 16-pin LLP package. It receives and equalizes cable lengths in excess of 140 meters of Belden 1694A cable at 1.5 Gbits/s and greater than 350 meters at 270-Mbits/s. The LMH0044 consumes 208-mW of typical power from a 3.3-V supply.
Packaged in an 8-pin SOIC, National’s LMH0002T is the first multi-rate cable driver offered in a -40°C to 85°C industrial temperature range. The LMH0002T offers low additive jitter of 18 ps (SD) and 22 ps (HD), and low power consumption of 125 mW (SD) and 149 mW (HD).
Packaged in a 64-pin TQFP, National’s LMH0030 is claimed to be the industry’s lowest-jitter SMPTE-compliant HD/SD serializer, with 85-ps typical and 125-ps maximum of output jitter. The multi-rate serializer offers a proprietary color bar test pattern generator, ancillary data FIFO and low power consumption of 430-mW typical at 3.3-V. The LMH0030 requires no external VCO. It derives its reference frequency from the incoming data stream to reduce design complexity and lower bill of materials.
Available now, the LMH0202 costs $9.63, the LMH0024 costs $12.44, the LMH0044 costs $22.97, the LMH0002T costs $7.66 and the LMH0030 costs $24.88, each in quantities of 1,000. Evaluation boards are also available. The LMH0046 costs $23.93 each in quantities of 1,000 and samples will be available in the third quarter of 2006.
For more information on the LMH0046 or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0046.html
For more information on the LMH0202 or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0202.html
For more information on the LMH0024 or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0024.html
For more information on the LMH0044 or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0044.html
For more information on the LMH0002T or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0002.html
For more information on the LMH0030 or to order samples and an evaluation board, visit www.national.com/pf/LM/LMH0030.html
National Semiconductor Corp., 1-800-272-9959, www.national.com