Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LMH0340 serialiser and LMH0341 deserialiser
Edited by the Electronicstalk Editorial Team on 20 April 2007
Chipsets for use in latest broadcast
video systems
A 3Gbit/s multi-rate serial digital interface (SDI) serialiser and deserialiser links to host FPGAs
National Semiconductor has introduced a 3Gbit/s multirate serial digital interface (SDI) serialiser and deserialiser to complement its expanding portfolio of professional and broadcast video products Building on the company's analogue expertise, National claims to have delivered the industry's lowest output jitter SDI serialiser (50ps) and highest input jitter tolerance deserialiser (0.6 units interval)
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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Additionally, the 3Gbit/s chipset changes the way professional video system designers interface SDI serialisers and deserialisers with host field programmable gate arrays (FPGAs).
National has also introduced a separate 3Gbit/s SDI chipset, including equaliser, reclocker and cable driver.
The highly integrated chipset consists of the LMH0340 3Gbit/s serialiser with integrated cable driver and LMH0341 deserialiser with reclocked serial loop-through.
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The products provide 3Gbit/s transmit and receive functions for a wide range of broadcast video production and processing applications, including production switchers, digital video recorders, camcorders, video format convertors and video editing equipment.
The chipset is a discrete SDI serialiser and deserialiser which supports the new Society of Motion Picture and Television Engineers (SMPTE) 424M specification for uncompressed serial transmission of high-definition (HD) broadcast video signals up to 60frame/s.
The chipset's architecture uses a proprietary technique to reduce the parallel bus between the serialiser and FPGA from a 20bit single-ended interface to a 5bit low-voltage differential signalling (LVDS) interface.
This simplifies board layout by reducing the number of traces between the serialiser, deserialiser and FPGA.
In addition, the chipset's LVDS reduces electromagnetic interference (EMI), and the narrow parallel bus enables a single low-cost FPGA to support a greater number of high-speed video channels.
"National's SDI serialisers and deserialisers combined with the first 65nm, low-cost FPGAs, provide a compelling triple-rate SDI solution for broadcast equipment manufacturers", says Todd Scott, senior director of Altera's broadcast business unit.
"System designers can now take advantage of the increased video quality of 1080p on the just-announced Cyclone III FPGA family in addition to the SERDES integrated Stratix IIGX family".
"We're delighted to collaborate on the LMH0340/341 Spartan-3E-based evaluation platform", says Paolo Masini, senior manager of Broadcast Vertical Marketing at Xilinx.
"National's new family of SDI serialisers and deserialisers are the perfect complement to our Spartan-3E family of FPGAs".
"This combination offers a very high performance and competitively priced solution for high speed broadcast connectivity requirements".
Offered in a small 48-pin LLP package, National's LMH0340 3Gbit/s multi-rate SDI serialiser supports 270Mbit/s, 1.485Gbit/s and 2.97Gbit/s data rates, enabling transmission of digital video broadcasting-asynchronous serial interface (DVB-ASI), standard-definition (SMPTE 259M), high-definition (SMPTE 292M) and the new 3Gbit/s SDI standard (SMPTE 424M) for uncompressed serial transmission of 1080p50/60 signals over a single link of coaxial cable.
The serialiser and driver consume 437 mW of power from typical supply voltages, delivering a 40% power reduction over existing HD solutions requiring a serialiser and external driver.
Offered in a small 48-pin LLP package 60% smaller than competitive HD products, National's LMH0341 is the companion deserialiser to the LMH0340 supporting DVB-ASI at 270Mbit/s and SDI for SD, HD and 3Gbit/s data rates.
The LMH0341 has an integrated reclocker that provides a wide input jitter tolerance of 0.6 unit intervals (UI), allowing the product to receive and deserialise signals with more than 60% of the signal's "eye" closed.
The reclocked loop-through feature includes an integrated cable driver that automatically adjusts the output slew rate compliant to the incoming data rate.
Similar to the LMH0340, it requires no external VCO.
At 2.97Gbit/s, typical power consumption is 445mW, approximately half that of competitive devices operating at HD rates.
In addition to National's chipset for 3G multirate operation, the company also offers two chipsets for HD/SD operation and one for SD-only operation.
These chipsets include the LMH0040 serialiser and LMH0041 deserialiser for full-featured HD/SD operation, LMH0050 and LMH0051 for reduced cost HD/SD operation, and the LMH0070 and LMH0071 for SD-only operation.
All four SDI chipsets will begin sampling in Q3 2007.
The LMH0340 costs US $37, the LMH0341 costs $40, the LMH0040 costs $28.50, the LMH0041 costs $31, the LMH0050 costs $25, the LMH0051 costs $25, the LMH0070 costs $18 and the LMH0071 costs $19, each in quantities of 100.
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