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800Msamples/s interpolating DAC

Texas Instruments has introduced a 16bit, 800Msamples/s interpolating DAC (digital-to-analogue converter), which provides 75dBc third-order intermodulation distortion at 200MHz. Offered in a 7x7mm QFN package, the DAC3283 saves board space in wireless communications, software defined radio, test and measurement, and power amplifier linearisation applications. Incorporating a single byte wide differential interface, the device reduces data input pins, allowing designers to choose a low-cost FPGA or ASIC to precede the DAC. The single-carrier WCDMA adjacent channel leakage ratio of 81dBc for 153MHz IF offers improved spectral performance while simplifying system design. Selectable 2x/4x interpolator filters allow for lower reduced data input rates, while taking advantage of up to 800Msamples/s DAC rates. I/Q phase and offset correction provides better performance when driving quadrature modulators (TRF370417) in demanding 3G, 4G and multi-carrier systems with transmit frequencies from 50MHz to 6GHz. The multi-DAC synchronisation support reduces design complexity for diversity and smart antenna radios.