ICs target applications with tough jitter budgets

3rd September 2014

Staff Reporter

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Offered in a 5x5 mm package, the ZL30252 and ZL30253 any-to-any frequency clock multiplier and jitter attenuator ICs are now available from Microsemi. With a clock multiplier jitter performance of 160fs in the 12kHz-20MHz band and a jitter attenuator performance of 250fs in the 12kHz-20MHz band, the devices are aimed at applications with tough jitter budgets and tight board real estate restrictions.

The devices afford communication equipment customers with a timing solution that meets jitter performance imposed by new 100Gbps PHY devices. Designers can also reduce overall BOM and simplify design with precise frequency conversion from any 1kHz to 1.25GHz input frequency to any 1Hz to 1.035GHz output frequency, and jitter attenuation bandwidths from 14Hz to 500Hz.

When combined with Microsemi’s ZL402xx series fan-out buffers, the ZL30252 and ZL30253 provide complete timing solutions for complex systems such as wireless base stations, wireless backhaul, wired infrastructure, SONET/ SDH, GE, 10G/40G/100G Ethernet, optical, storage and broadcast video applications.

The ZL30252 and ZL30253 offers NCO mode in which output frequencies can be controlled with very high resolution by system software. This capability allows the devices to replace solutions using large, expensive, fixed-frequency voltage-controlled oscillators (VCXOs) with a small, low-cost and any output clock solution.

The ZL30252 and ZL30253 are also flexible building-blocks that system designers can use in various parts of their design. For example, they can be used as a master clock jitter attenuator and multiplier for other Microsemi timing ICs. This allows customers to reuse previously-qualified TCXOs or OCXOs regardless of frequency or jitter. When deployed on a line card, the devices simplify system design and reduce the cost of backplane connectors by accepting low frequency clocks from the backplane and performing rate conversion and jitter attenuation on the line card.

“The drive by developers for universal physical layer interfaces employing pluggable optics created the need for flexible clock multipliers such as the ZL30252 and ZL30253,” said Maamoun Seido, vice president and business unit manager of Microsemi's timing products. “Furthermore, new physical layer SERDES and mappers are driving the need for the superior jitter performance provided by the ZL30252 and ZL30253 to support the higher data rates.”