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National Semiconductor Introduces Precision Clock Conditioners with Industry’s Lowest Jitter Performance

Five Programmable Clock Conditioning Devices Feature Jitter Performance as Low as 0.2 Picoseconds

Nov 14, 2006

MUNICH, Germany and SANTA CLARA, Calif. - November 14, 2006 – National Semiconductor Corporation (NYSE: NSM), a leading supplier of high-speed interface devices, today introduced a family of five precision clock conditioners that integrate all the functions required to clean and distribute ultra-low-noise clock signals throughout a system.  Featuring National’s phase locked loop (PLL), voltage controlled oscillator (VCO) and high-speed interface technology, these clock conditioners deliver the industry’s best jitter performance, making them well-suited for accurate clocking in high-performance data conversion and data processing sub-systems.

The new family will be demonstrated clocking National’s new analog-to-digital converters in National’s booth #506 in Hall A4, at the Electronica trade show in Munich, Germany, from November 14-17.  The demonstrations highlight wireless and wired infrastructure, medical, and test and measurement applications as three of the key equipment markets for the clock conditioners.

Unparalleled Integration and Performance
National’s new LMK03000, LMK03000C, LMK03001, LMK03001C and LMK02000 clock conditioners integrate a high-frequency PLL, an ultra-low noise VCO and programmable low-noise outputs.  The clock conditioners deliver typical jitter performance as low as 0.2 picoseconds (ps), the lowest in the industry from a single chip.  Until today, system designers used expensive multiple-chip voltage controlled crystal oscillators (VCXOs) or clock modules to achieve low jitter.  National’s new single-chip clock conditioners significantly reduce the system cost and save board space, power and design time.  In addition, the clock conditioners create eight frequency and skew-programmable copies of the conditioned clock, eliminating the cost, jitter and space associated with external clock distribution components.  This feature enables clocking complex systems that require multiple clock frequencies for different functional blocks.  National’s clock conditioner family is available in three pin-compatible performance grades, allowing flexible system design performance evolution using one PC board layout.

National fabricates the clock conditioner family on its proprietary BiCMOS8 process technology in its South Portland, Maine, facility.  This state-of-the-art silicon germanium process enables the devices to achieve the lowest jitter and power performance in the industry.

Key Technical Features Clock Conditioners
National’s new precision clock conditioners deliver jitter performance as low as 0.2 ps from a noisy 1 MHz to 200 MHz input clock.  They feature a high-performance integer-N PLL core, an integrated VCO and three LVDS plus five LVPECL clock outputs.  The LMK03000C and LMK03001C each feature jitter performance at 0.4 ps RMS and the LMK03000 and LMK03001 feature jitter performance at 0.8 ps RMS.  The new LMK02000 clock conditioner features a PLL core that connects to an external VCXO for even lower jitter at 0.2 ps RMS.  National’s new clock conditioning devices are offered in small 48-pin LLP®  packages and are footprint-compatible with each other to allow the system designer to easily scale up or down in jitter performance without changing the PC board layout.

Each of the eight clock conditioner outputs incorporates a low-noise clock distribution channel including a dedicated programmable divider, a phase synchronization circuit, a programmable delay block and an LVDS or LVPECL clock output buffer.  The system designer programs each clock output divider and delay circuit individually to create multiple integer-related, but phase-adjusted copies up to 785 MHz frequency, with output skew adjustable from 0 to 2.25 ns in 150 ps steps.

National’s clock conditioners also allow the system designer to place all clock outputs into a high impedance state via the global output enable (GOE) pin.  The designer can connect the GOE to the chip’s lock detect (LD) output to automatically disable all the outputs when a valid input clock is not present.  In addition, the designer can individually place unused outputs into high impedance.  When using multiple clock conditioners, the devices provide a synchronization input pin to easily synchronize multiple clock conditioner devices on start-up.

For more information on the LMK03000, LMK03000C, LMK03001, LMK03001C and LMK02000 clock conditioners, or to order samples, visit http://www.national.com/pf/LM/LMK03000.html, http://www.national.com/pf/LM/LMK03000C.html,
and http://www.national.com/pf/LM/LMK02000.html.

About National’s Interface Products
National Semiconductor, the LVDS technology innovator and market leader, offers a wide range of interconnect solutions that transfer high-speed digital signals using world-class analog technology.  These solutions help system designers develop high-performance applications in a variety of markets, including communication and industrial systems.  The products feature high reliability, low power and low noise, as well as dramatic systems savings in cable and connector costs.  National Semiconductor is the world’s largest supplier of high-speed LVDS products, according to Databean’s 2005 Analog IC Market Share survey.  For more information on National’s interface products, visit http://www.national.com/appinfo/interface/

Pricing and Availability
The LMK03000C and LMK03001C are priced at $18.99 each, the LMK03000 and LMK03001 are $15.45 each, and the LMK02000 is $12 each in 1,000-unit quantities.  Samples of all the clock conditioning devices are available now and production quantities will be available in April 2007.  For evaluation cards and applications support collateral, visit http://www.national.com/appinfo/interface/

Note to editors:  To view a high-resolution downloadable photo of these products, visit National's photo gallery at http://www.national.com/company/pressroom/gallery/network.html.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems.  National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $2.16 billion for fiscal 2006, which ended May 28, 2006.  Additional company and product information is available at www.national.com