DAC has spectral purity for broadband wireless

Linear Technology’s LTC2000A is a 16-bit, 2.7Gsample/s digital-to-analogue converter (DAC) with a spectral purity for broadband wired-and-wireless communications and radar applications.

The chip’s spectral purity is 80dBc SFDR at 50MHz output and 72dBc SFDR at 1080MHz output.

The device features better than 78dBc 2-tone intermodulation distortion (IMD) from DC to 1080MHz output, low phase noise and a wide 2.1GHz -3dB output bandwidth.

The ±1V compliant outputs feature a 40mA full scale current which can be adjusted as low as10mA or as high as 60mA to suit the application.

Data is transferred to the DAC over a parallel LVDS interface port with transfer rates of up to 1.35Gsample/s using a 675MHz double data rate (DDR) data clock. Dual DDR ports are required to achieve the 2.7Gsample/s update rate while a single port can be used to operate at a lower 1.35Gsample/s update rate.

At 2.7Gsample/s, the LTC2000A consumes 2.4W from dual 1.86V and 3.3V supplies.

The chip is available in 16-bit, 14-bit and 11-bit versions in a RoHS compliant 9mm x 15mm BGA package.

 

 

Richard Wilson

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