Texas Instruments LMK03806 integrated clock generator

An integrated clock generator featuring good jitter performance offers designers the ability to synthesise their required clock frequencies from a single low-cost crystal, enabling a reduction in component count of up to 80%, board size.

The LMK03806 simplifies timing architectures in wired and optical communications line cards by simultaneously synthesising seven independent frequencies on 14 outputs. With an output frequency that spans 2.37 MHz to 2.6 GHz, the device provides clocking support for all the components on a typical line card.

Key features include: high-frequency voltage-controlled oscillator and programmable output dividers; ultra-low jitter (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; and crystal interface (allows designers to use a low-cost crystal for simultaneously generating multiple clocks).

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. It features 51 fs RMS jitter at 156.25 MHz and less than 30 fs RMS at 312.5 MHz output when paired with the LMK03806 clock generator.

Its flexibility allows clock designers to address several additional markets, including wireless infrastructure and industrial applications.