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National delta-sigma PLLs boast low power consumption

Posted: 09 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? lmx2470? lmx247x? pllatinum? pll?

National Semiconductor Corp. has introduced a new family of delta-sigma fractional-N PLLs into its PLLatium portfolio of devices for use in cellular applications.

The new devices are claimed to be industry's lowest power consuming delta-sigma PLLs and use digital modulation techniques for improved phase noise, spurs, and lock time performance in applications requiring fine frequency resolution.

The first device in the family is the LMX2470, which is housed in a 3.5-by-4.5-by-0.6mm ultra-thin CSP making it suitable for use in 2G, 2.5G, and 3G mobile handsets, basestations, WLANs, and other wireless communication systems.

It features a maximum RF operating frequency of 2.6GHz and 800MHz IF frequency. It is touted to be the industry's first delta-sigma PLL that allows users to software select the modulator order, as well as being the only one that has true cycle slip reduction and integrated timeout counters for fastlock, the company said.

The LMX2470 has 32 current (charge pump) level and four levels of comparison frequency reduction. It also has up to a 22-bit selectable modulus that enables high comparison frequencies for a normalized phase performance of -210dBc/Hz. Fractional spurs are <-90dBc - the industry's lowest.

The device operates from a 2.5V and draw 4.1mA total current. It is priced at $2.07 in 1,000-unit quantities.

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