The AD9559 from Analog Devices is a fully programmable, jitter-attenuating, dual-clock translator IC addressing the timing requirements of high-speed optical transport network (OTN) applications and high-density line cards.
The quad-input multiservice line-card adaptive clock translator simultaneously supports different standard frequencies for wired communications applications, including synchronous Ethernet, SONET/SDH, 1/10/100G Ethernet, Fibre Channel, and other applications that require low jitter and flexibility.
The AD9559 synchronously converts any standard input frequency to any standard output frequency at up to 1,25 GHz with sub-400 fs RMS total jitter over a 12 kHz to 20 MHz integration bandwidth. It replaces two synchronous timing devices with a single IC, helping designers with board space constraints and cost optimisation.
Adaptive clocking allows the DPLL (digital phase-locked loop) divider ratios to be changed while the DPLL is locked. This enables the frequency at the output to be dynamically adjusted over a ±100 ppm range, around the nominal output frequency, with a resolution in frequency step as low as sub-0,1 ppb, without breaking the loop and reprogramming the part.
The AD9559 IC’s parallel DPLL architecture allows the user to generate output clocks that are completely independent of each other. Each of the two DPLLs can be synchronised to one of up to four input references, and each DPLL generates two output clocks. The DPLL allows for reduction of input time jitter or phase noise associated with the external references.
The chip continuously generates a clean (low-jitter) valid output clock, even when all references have failed, by means of a digitally-controlled loop and holdover circuitry. The built-in programmability of the clock translator allows network line card designers to use the same component in many different board designs, limiting the number of components needed and reducing overall system cost.
At 10 x 10 mm in size, the AD9559 provides a compact, frequency-agile, cost-effective clock for line-card designers. Applications include data communications, next-generation wired networking applications, test and measurement, high-speed data acquisition, video applications and wireless base-station controllers.
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