Clock IC synchronises with GPS signals
22 July 2009
Electronics Technology
Analog Devices has introduced what it claims is the industry’s first clock IC that enables system designers to use the standard, readily available and free 1 pps (pulse-per-second) signal of GPS (global positioning system) satellite transmitters to generate and synchronise clock signals for communications infrastructure equipment.
Developed for remote optical and wireless network nodes, cable infrastructure and data communications equipment, the AD9548 clock generator/synchroniser eliminates the dedicated oscillators, phase locked loops, and other clock recovery circuitry communications systems previously required to generate clock signals synchronised to the widely available 1 pps GPS standard.
The AD9548 includes a digital PLL that up-converts the 1 pps GPS signal while reducing input time jitter or phase noise associated with the external references to as little as 300 femtoseconds. The clock distribution section provides four output drivers. Each driver is programmable either as a single differential LVPECL/LVDS (low-voltage positive emitter-coupled logic/low-voltage differential signalling) output or as pairs of single-ended CMOS (complementary metal-oxide semiconductor) outputs.
Each of the four outputs has a dedicated 30-bit programmable post divider enabling the generation of multiple different output frequencies. An integrated reference clock multiplier allows for system clock references as low as 4 MHz while still supporting outputs of up to 450 MHz. The AD9548 also includes a digitally controlled loop filter programmable to as low as 1 mHz, as well as manual and automatic holdover circuitry that continuously generates a low-jitter, valid output clock even when some, or all, references have failed.
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