National Semiconductor recently introduced the first member of a new family of standalone, monolithic voltage-controlled oscillators (VCOs) for mobile handsets. VCOs are critical blocks in transceiver designs and their accuracy impacts overall radio performance. This new family complements National's other RF products, which include PLLatinum phase-locked loops and single-chip circuits that integrate PLLs and VCOs.
The LMX2604 is the industry's only standalone, monolithic VCO with electrical performance suitable for mobile handsets, according to the manufacturer. Its footprint is 80% smaller than alternative solutions, such as a triple band VCO module. At 4 x 4 x 0,75 mm, this 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, it offers significant reliability benefits over multicomponent module solutions. National plans to introduce additional members of the VCO family throughout 2004.
The LMX2604 is designed for the GSM and GPRS cellular markets. It has low phase noise and +6 dBm high output power in all bands, which is ideal for use with transmit closed-loop modulation. The LMX2604 also has low current consumption of 18 mA in GSM mode and 15 mA in DCS/PCS mode.
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