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Converters for Digital Cellular Applications

Mon, 04/30/2001 - 6:15am
M/A-COM, a brand of Tyco Electronics added four new products to their portfolio of low-cost, highly integrated upconverter and downconverter ICs. New members of the family include the MD59-0043 (800 to 900 MHz) and MD59-0049 (1.8 to 2 GHz) downconverters, and the MD59-0062 (1,710 to 1,810 MHz) and MD59-0054 (824 to 849 GHz) upconverters. All four highly integrated converters combine to provide a multi-mode, dual band chip set solution for protocols such as CDMA, J-CDMA, TDMA and EDGE. This chipset improves linearity performance and reduces current drain.

The MD59-0043 and MD59-0049 downconverters integrate a low-noise amplifier, RF amplifier, mixer, IF amplifier, LO buffer and various control functions in miniature 4 mm FQFP-N plastic packages. The resulting benefits to the radio designer include higher linearity, wider dynamic range and lower power consumption. The MD59-0043 is particularly useful as an ultra-low current downconverter for cellular band CDMA handsets and other battery-operated RF systems; whereas the MD59-0049 low-current downconverter is specified for PCS band RF systems.

The PCS and cellular upconverters (MD59-0062 and MD59-0054) feature an on-chip driver for highly linear output power and 4-mm FQFP-N plastic packaging for ultra-low profile applications. The MD59-0054, for example, is capable of producing 4 dBm of linear output power with an associated ACPR of -56 dBc. The MD59-0062, which operates in U.S. and Korean PCS bands, also features a low-current mode for additional power savings.

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