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RF/Microwave  

16bit DAC offers 75dBc IMD3 at 200MHz

Posted: 14 Apr 2010     Print Version  Bookmark and Share

Keywords:DAC  data  differential interface 

Texas Instruments Incorporated (TI) debuts the DAC3283 a digital-to-analogue converter in a 7mm x 7mm QFN package which it touts as the smallest DAC in its class, saving valuable board space in wireless communications, software defined radio (SDR), test and measurement, and power amplifier linearisation applications.

The 16bit, 800MSps interpolating DAC, provides 75dBc third-order intermodulation distortion (IMD3) at 200MHz. Incorporating a single byte wide differential interface, the DAC3283 reduces data input pins by 50 per cent, allowing designers to choose a lower-cost FPGA or ASIC to precede the DAC.

The DAC3283 features a single-carrier WCDMA adjacent channel leakage ratio (ACLR) of 81dBc for 153MHz IF offers improved spectral performance while simplifying system design. It's selectable 2x/4x interpolator filters allow for lower reduced data input rates, while taking advantage of up to 800MSPS DAC rates. It's 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 50 MHz to 6 GHz. The multi-DAC synchronisation support reduces design complexity for diversity and smart antenna radios.

The DAC improves spectral performance, saves space and cost in wireless communications, software defined radio and test and measurement equipment.





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