16-bit, 2.7 Gsps DAC delivers 80 dB SFDR, high spectral purity

May 12, 2015 // By Graham Prophet
LTC2000A is a 16-bit, 2.7 Gsample/sec digital-to-analogue converter (DAC) optimised for high end broadband wired-and-wireless communications and radar applications.

The LTC2000A offers exceptional spectral purity of 80 dBc SFDR at 50 MHz output and 72 dBc SFDR at 1080 MHz output to meet the most stringent requirements of high end applications. The device features better than 78 dBc 2-tone intermodulation distortion (IMD) from DC to 1080 MHz output, low phase noise and a 2.1 GHz -3dB output bandwidth. LTC2000A enables broadband or high frequency direct RF synthesis in applications such as instrumentation, broadband communications, test equipment and cable TV DOCSIS CMTS.

The ±1V compliant outputs has a 40 mA full scale current which can be adjusted from 10 mA to 60 mA to suit the application. Data is transferred to the LTC2000A over a parallel LVDS interface port with transfer rates of up to 1.35 Gsample/sec using a 675 MHz double data rate (DDR) data clock. Dual DDR ports are required to achieve the 2.7 Gsps update rate while a single port can be used to operate at a lower 1.35 Gsps update rate. At 2.7 Gsps, the LTC2000A consumes 2.4W from dual 1.86V and 3.3V supplies, while at 1.35 Gsps the device consumes 1.4W. Designed for ease of use, the LTC2000A offers an internal pattern generator, LVDS loop out MUX, and junction temperature sensing to simplify system development and debug.

The LTC2000A is offered in 16-bit, 14-bit and 11-bit versions in a RoHS compliant 9 x 15 mm BGA package for $79.00 each, for the LTC2000A-16, (1,000).

Linear Technology; www.linear.com/product/LTC2000A

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