Telecoms, Datacoms, Wireless, IoT


Multiple-output clock generators

25 November 2009 Telecoms, Datacoms, Wireless, IoT

New from Maxim are the MAX3627/MAX3629 low-jitter clock generators for high-speed networking applications. The MAX3627 has seven LVDS outputs and one LVCMOS output, while the MAX3629 has five LVDS outputs and three LVCMOS outputs. Both devices utilise a low-noise crystal oscillator and PLL architecture to generate high-frequency (312,5 MHz), low-jitter (0,14 ps RMS) clock signals from a 25 MHz crystal or reference clock input.

The MAX3627 and MAX3629 simultaneously generate two pin-selectable frequencies for both Ethernet port clocking and MAC clocking. This function eliminates the need for an expensive high-frequency oscillator and a fanout buffer, thus saving board space and cost. With excellent power-supply noise rejection (PSNR), both devices minimise jitter degradation in noisy power-supply environments, minimising overall jitter degradation for increased quality of system timing design.

The devices are best suited for Ethernet interface applications, such as enterprise switches and routers, and other high-speed data-communication systems that require a low-jitter Ethernet frequency. They are fully specified over the 0°C to +70°C commercial temperature range, and operate from a 3,3 V ±5% power supply. They are available in lead-free, 32-pin TQFN packages.

For more information contact Larry Gordon, CST Electronics, +27 (0)11 608 0070, [email protected], www.cstelectronics.co.za



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