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Clock jitter attenuator boosts JESD204B serial interface

Posted: 10 Sep 2015 ?? ?Print Version ?Bookmark and Share

Keywords:clock jitter attenuator? data converter? clock management? PLL? VCO?

Analog Devices developed a clock jitter attenuator designed to support the JESD204B serial interface standard for connecting high-speed data converters and field-programmable gate arrays (FPGAs) operating in base station designs.

The JESD204B interface was specifically developed to address high-data rate system design needs, and the 3.2GHz HMC7044 clock jitter attenuator contains functions that support and enhance the unique capabilities of that interface standard. The HMC7044 delivers 50fs jitter performance, which improves the signal-to-noise ratio and dynamic range of high-speed data converters, and the device provides 14 low-noise and configurable outputs that provide flexibility in interfacing with many different components.

The HMC7044 also offers a wide range of clock management and distribution features that make it possible for designers of base stations to build an entire clock design with a single device.

In base stations applications, many serial JESD204B data converter channels require their data frames to be aligned with an FPGA. The HMC7044 clock jitter attenuator simplifies JESD204B system design by generating source-synchronous and adjustable sample and frame alignment (SYSREF) clocks in a data converter system.

The device features two phase-locked loops (PLLs) and overlapping, on-chip, voltage-controlled oscillators (VCOs). The first PLL locks a low-noise, local voltage-controlled clock oscillator (VCXO) to a relative noisy reference, while the second PLL multiplies the VCXO signal up to the VCO frequency with exceptionally little added noise.

For cellular infrastructure JESD204B clock generation, wireless infrastructure, data converter clocking, microwave base band cards and other high-speed communications applications, the architecture of the HMC7044 offers excellent frequency generation performance with low phase noise and integrated jitter.

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