Product category: Frequency Control Components
News Release from: National Semiconductor | Subject: LMX2604
Edited by the Electronicstalk Editorial Team on 02 February 2004
Small claims for triple-band GSM VCO
The LMX2604 is the first in a new family of stand-alone monolithic voltage-controlled oscillators for mobile handsets.
The LMX2604 is the first in a new family of stand-alone, monolithic voltage-controlled oscillators (VCOs) for mobile handsets VCOs are critical blocks in transceiver designs and their accuracy impacts overall radio performance
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
Related stories
Dual-port Gigabit Ethernet transceiver
National Semiconductor has announced the DP83862, a low-cost, highly integrated dual-port 10/100/1000 physical layer transceiver.
World's smallest multifunction supervisory ICs
National Semiconductor has announced a family of supervisory ICs with a variety of factory-programmable features that can be configured in hundreds of possible combinations.
This new family of monolithic VCOs complements National's other radio frequency (RF) products, which include market-leading PLLatinum(tm) phase-locked loops (PLLs) and single-chip circuits that integrate PLLs and VCOs.
The first member of this new family of VCOs, the LMX2604, is the industry's only stand-alone, monolithic VCO with electrical performance suitable for mobile handsets.
Its footprint is 80% smaller than alternative solutions, such as a triple band VCO module.
Further reading
Leadless leadframe package shrinks LDO
National Semiconductor has introduced a full-featured 500mA LDO regulator for medium-current applications in computing devices and portable products.
Boomer shrinks stereo headphone amplification
New from National Semiconductor, the LM4811 Boomer audio amplifier is a 105mW stereo headphone amplifier for use in 3 and 5V systems requiring a headphone output and volume control.
This 4 x 4 x 0.75mm IC allows system designers to save significant board space in mobile handsets and is 50% thinner than other solutions.
In addition, because it is monolithic, the LMX2604 offers significant reliability benefits over competing multicomponent module solutions.
National plans to introduce additional members of the VCO family throughout 2004.
"National wrote the book on PLLs, and we continue to innovate in the RF field with the introduction of the world's first monolithic VCO suitable for mobile handsets.
With manufacturers adding more and more consumer features to handsets, such as wireless connectivity and cameras, board space is at a premium.
That's why a product like the LMX2604, which conserves significant board space inside the handset, offers so many advantages for system designers", said Paul Boyer, Product Marketing Manager for National's RF product group.
"This family of monolithic VCOs is the result of work we did in the development of a product family that integrates PLLs and VCOs onto a single chip.
National's PLL+VCO solution, introduced last spring, is unique to the market and takes up 67% less board space than discrete solutions, also enabling significant space savings".
The LMX2604 is designed for the GSM and GPRS cellular markets and meets the demanding specifications of these standards.
The LMX2604 provides on-chip RF VCOs for GSM at 880 to 915MHz, for DCS at 1710 to 1785MHz, and for PCS at 1850 to 1910MHz.
It has low phase noise: -167dBc/Hz at 20MHz offset in the GSM band, and -162dBc/Hz at 20MHz offset in the DCS and PCS bands.
High output power is +6dBm in all bands, which is ideal for use with transmit closed-loop modulation.
The LMX2604 also has low current consumption of 18mA in GSM mode and 15mA in DCS/PCS mode.
The LMX2604, available now and packaged in a tiny 20-pin surface mount leadless leadframe package (LLP), is priced at $1.35 for 1000 units.
• National Semiconductor: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
