Maxim radio DAC supports WCDMA and LTE
Maxim’s multi-Nyquist RF digital-to-analogue converter (DAC) is a digital software-defined radio (SDR) transmitter for multicarrier, multiband, and multistandard basestations.
Designed to work with FPGA-based direct digital synthesis (DDS), the MAX5879 RF DAC architecture shifts the functions of the analogue quadrature modulator and agile local oscillator (LO) used in current architectures into the digital domain.
According to the supplier, this eliminates in-phase and quadrature errors, and LO feedthrough, commonly associated with analog upconversion.
The MAX5879’s selectable frequency response modes support direct RF synthesis of common 3G/4G cellular bands in multiple Nyquist zones from 700MHz to 2.8GHz, and so the one device can be used with multiple standards such as multicarrier GSM, WCDMA and LTE.
The MAX5879’s selectable 4:1 and 2:1 input data multiplexer lets hardware designers reduce input word rates, and this allows use of lower-cost FPGAs.
The device is packaged in a 256-ball (17mm x 17mm) CSBGA.