14-bit DACs perform direct digital synthesis
The 14-bit AD9789 and AD9739 D/A converters feature the company’s Mix-Mode super-Nyquist architecture, which supports digital synthesis of RF signals up to 3.6 GHz. The AD9789 integrates a QAM encoder, interpolator, and digital up-converter that achieves a 2.4-GHz sample rate for cable infrastructure. The QAM encoder supports constellation sizes of 16, 32, 64, 128, and 256 with SRRC (square-root raised cosine) filter coefficients for all standards.
The AD9789 operates from 1.5-, 1.8-, and 3.3-V supplies for a total power consumption of 1.7 W. The 2.5-GHz AD9739 features a dual-port LVDS, an output current that is programmable from 8.7 to 31.7 mA, a supply voltage from 1.8 and 3.3 V, and a total maximum power consumption of 1.1 W. Both parts include an SPI port for devices configuration and are housed in CSBGA packages. (Ea/1,000: AD9739, $43.69; AD9789, $53.10 — available now.)
Analog Devices , Wilmington , MA
Technical Support 800-262-5643
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