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Clock Generator Simplifies Timing Architectures for Wired, Optical Communications

Thu, 10/06/2011 - 11:10am
clock generatorTexas Instruments introduced an integrated clock generator featuring exceptional jitter performance. The National LMK03806 offers designers the ability to synthesize their required clock frequencies from a single low-cost crystal, enabling a reduction in component count of up to 80 percent, board size, and bill of materials (BOM) cost by up to 50 percent, while improving performance over legacy solutions, according to the company. The LMK03806 simultaneously synthesizes seven independent frequencies on 14 outputs. With an output frequency that spans 2.37 MHz to 2.6 GHz, the chip provides clocking support for all of the components on a typical line card. Features include a high-frequency voltage-controlled oscillator (VCO) and programmable output dividers; sub-50 fs rms jitter at 312.5-MHz output frequency improves bit error rate and carrier-to-noise ratio performance; programmable LVDS, LVPECL and LVCMOS -- each output clock is independently configurable, eliminating the need for level translators and fanout buffers; and a crystal interface.

The companion LMK00301 differential fanout buffer/level translator accepts a single-ended, differential or crystal input, and produces 10 additional buffered copies of the input clocks of up to 3 GHz in LVDS, LVPECL or HCSL format. The LMK00301 features best-in-class jitter performance, generating 51 fs rms jitter at 156.25 MHz, and less than 30 fs rms at 312.5 MHz output frequency when paired with the LMK03806 clock generator. Its extreme flexibility allows clock designers to address several additional markets, including wireless infrastructure and industrial applications.

The LMK03806 and LMK00301 clocking ICs can be combined with TI's TMS320C6748 DSP and TMS320C66x multicore DSPs to offer a signal-chain solution.

Texas Instruments
800-477-8924, www.ti.com
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