Date: 22/03/2011

Clean out the clock jitter using National Semiconductor's LMK04800 ICs

National Semiconductor has introduced a new family of clock jitter cleaners featuring the industry's lowest phase noise and rms jitter performance: 111 femtosecond (fs) from 12 kHz to 20 MHz, and a wideband noise floor of -162 dBc/Hz at 184 MHz output frequency.

National says this level of phase noise enhances the performance of systems used in wireless and wired communications, test and measurement, medical imaging, software defined radio (SDR) and digital broadcast applications, while reducing overall bill of materials (BOM) cost.

The LMK04800 family is comprised of four integrated circuits (ICs) including the LMK04808, LMK04806, LMK04805 and LMK04803, and is optimized for generating different frequencies up to 1.5 GHz for clocking ADCs, DACs, SerDes and FPGAs.

These clock jitter cleaning ICs LMK04800 features holdover, switchover, multiple inputs, digital delay, analog delay, odd/even dividers and 12 programmable output format drivers. According to National the LMK04800 ICs are highly flexible and configurable to support a variety of different architectures all while reducing the number of components and design effort traditionally required to implement these functions.

Supplied in 64-pin LLP packages, the LMK04808, LMK04806, LMK04805 and LMK04803 are available now and priced at $9.15 each in 1,000-unit quantities.