Mixed Signal/Analog

DAC provides 74dBc SFDR at 200MHz output

9th September 2014
Siobhan O'Gorman
0

Claiming to offer an improvement over alternative 14-bit DACs, the LTC2000 DAC offers exceptional spectral purity of 74dBc SFDR at 200MHz output. The 16-bit 2.5Gsps device, launched by Linear Technology, also offers better than 68dBc SFDR for output frequencies from DC to 1GHz. Due to the converter's 2.1GHz -3dB bandwidth, broadband or high frequency RF synthesis is possible in applications such as high-end instrumentation, broadband communications, test equipment, cable TV DOCSIS CMTS, and radar.

To suit a variety of applications, the ±1V compliant outputs feature a 40mA full scale current which can be adjusted as low as 10mA or as high as 60mA. Data is transferred to the LTC2000 via a parallel LVDS interface port with transfer rates of up to 1.25Gsps. While a single DDR port can be used for the DAC to operate at the 1.25Gsps update rate, dual DDR ports are required for it to operate at the higher update rate of 2.5Gsps. At this rate the converter consumes 2.2W from dual 1.8V and 3.3V supplies, while at 1.25Gsps consumes 1.3W. For ease of use, the LTC2000 provides an internal pattern generator, LVDS loop out mux and junction temperature sensing, simplifying system development and debug.

The DAC converter, which is also available in 14-bit and 11-bit versions, is offered in a RoHS compliant 9mm x 15mm BGA package. Available in commercial and industrial temperature grades, the converter is priced from $69.00 and sold in 1,000-piece quantities. 

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