The LTC2000 has low phase noise and a wide 2.1 GHz, -3 dB-point output bandwidth, enabling broadband or high frequency RF synthesis in applications such as high-end instrumentation, broadband communications, test equipment, cable TV DOCSIS CMTS, and radar. Linear Technology comments that in such applications, the DAC is usually the bottleneck in meeting demanding specifications, and that the LTC2000 relieves those pressures by offering a new level of spurious [generation] performance, over 1GHz bandwidth, very high linearity, and excellent accuracy.
The ±1V compliant outputs feature a 40 mA full scale current which can be adjusted as low as 10 mA or as high as 60 mA to suit the application. Data is transferred to the LTC2000 over a parallel LVDS interface port with transfer rates of up to 1.25 Gsample/sec using a 625 MHz double data rate (DDR) data clock. Dual DDR ports are required to achieve the 2.5 Gsample/sec update rate, while a single port can be used to operate at a lower 1.25 Gsample/sec update rate. At 2.5Gsample/sec , the LTC2000 consumes 2.2W from dual 1.8V and 3.3V supplies, while at 1.25 Gsample/sec the device consumes 1.3W. The DAC has an internal pattern generator, LVDS loop out mux, and junction temperature sensing to simplify system development and debug.