12-bit DAC touts best SFDR at RF

Sunnyvale, Calif.&#8212Maxim's 12-bit MAX19692, a 2.3 Gsps digital-to-analog converter (DAC), claims best-in-class dynamic range (SFDR) and overall performance among high-speed DACs that can directly synthesize high-frequency and wideband signals in multiple Nyquist zones.

“Maxim has developed a new high-speed DAC architecture that advances the state-of-the-art in terms of update rate, dynamic performance and multi-Nyquist capability,” said Ted Tewksbury, managing director for the High-Speed Signal Processing Business Unit. “These performance enhancements are achieved with a dramatic decrease in power consumption.”

Suited to radar waveform and local oscillator (LO) signal synthesis, direct digital generation of wideband RF signals, ultra-high-data-rate wireless modems, direct digital synthesis, automatic test equipment, and arbitrary waveform generators, the MAX19692 directly synthesizes wideband signals from DC to more than 2 GHz. The current-steering DAC, which has 4:1 multiplexed LVDS inputs, claims superior dynamic performance, including 68 dBc SFDR at 1,200 MHz (operating in 3rd Nyquist). This performance, according to the company, is 14 dB better for SFDR at this frequency than competing chips. The DAC's frequency response can be configured to optimize signal synthesis in each of the first three Nyquist zones. As a result, the device has higher SNR in 2nd and 3rd Nyquist and improved gain-flatness compared to that of conventional DAC architectures, which are optimized for the 1st Nyquist zone.

“The device not only advances dynamic performance and wideband capability in higher order Nyquist zones, but it also achieves this at one-third the power,” said Tim Church, business manager for high-speed DACs. At an update rate of 1.5 Gsps, the MAX19692, which works from 1.8- and 3.3-volt supplies, consumes 950 mW, 67 percent less power than the nearest competitor, says the company. In a 11-by-11 mm BGA, it's less than two-thirds the size of the nearest competitor, according to Maxim.

Click here to access the product's datasheet. The MAX19692 is in full production; pricing info will be available shortly. Evaluation kits are also available to speed designs; contact the company directly.

Maxim , 1-800-998-8800,

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