RF DAC delivers SDR benefits in basestations
The MAX5879 multi-Nyquist RF D/A converter delivers digital software-defined radio (SDR) benefits to macro- and small-cell basestations. Its RF DAC architecture shifts the functions of the analog quadrature modulator and agile local oscillator (LO) used in current architectures into the digital domain — eliminating in-phase and quadrature errors, and LO feedthrough, commonly associated with analog upconversion.
The part’s selectable frequency response modes support direct RF synthesis of common 3G/4G cellular bands in multiple Nyquist zones from 700 MHz to 2.8 GHz. A single MAX5879 RF DAC serves multiple standards, such as multicarrier GSM, WCDMA, and LTE, without compromising dynamic performance.In addition, the device has a selectable 4:1 and 2:1 input data multiplexer lets hardware designers reduce input word rates, and this allows use of lower-cost FPGAs.
This 14-bit, 2.3-Gsamples device Operating over the –40° to 85°C range, the part is housed in a 256-ball (17 x 17 mm) CSBGA package. (Contact company for pricing and availability.)
By Christina Nickolas
Maxim Integrated Products , Sunnyvale , CA
Sales 408-737-7600
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