The AD9731 is a 10-bit, 170 MSPS, bipolar D/A converter that is optimized to provide high dynamic performance, yet offer lower power dissipation and more economical pricing than afforded by previous bipolar high performance DAC solutions. The AD9731 was designed primarily for demanding communi-cations systems applications where wideband spurious-free dynamic range (SFDR) requirements are strenuous and could previously only be met by using a high performance DAC such as the industry-standard AD9721. The proliferation of digital communications into basestation and high volume subscriber-end markets has created a demand for excellent DAC perfor-mance delivered at reduced levels of power dissipation and cost.
The AD9731 is the answer to that demand.Optimized for direct digital synthesis (DDS) waveform recon-struction, the AD9731 provides 50 dB of wideband harmonicsuppression over a dc-to-65 MHz analog output bandwidth.This signal bandwidth addresses the transmit spectrum in many of the emerging digital communications applications where signal purity is critical. Narrowband, the AD9731 provides an SFDR of greater than 79 dB. This excellent wideband and
narrowband ac performance, coupled with a lower pricing struc-ture, make the AD9731 the optimum high performance DAC value.
The AD9731 is packaged in 28-lead SOIC (same footprint as the industry standard AD9721) and super space-saving 28-lead SSOP; both are specified to operate over the extended industrial temperature range of 40 to +85.
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