Versatile 125Msample/s DAC Supports Multiple Configurations

The NXP Semiconductors DAC1401D125 is a dual 14-bit DAC that can be used in either I/Q baseband or direct-IF communications applications, due to its 125Msample/s update rate, low distortion, tight gain matching and low offset error.

The DAC1401D125 has 1.8V-, 3.3V- and 5V compatible digital inputs allowing easy integration, and supports a number of input and output configurations to fulfil versatile functions. A Mode pin allows a choice of two data-input configurations: Dual-bus mode allows interfacing to two separate data ports, with an independent data input, clock input, and data-write signal to each DAC. In single-bus mode the device connects to a single high-speed data port, and demultiplexes interleaved data into the original I and Q components. It then converts and uploads at half the input rate.

The output full-scale current can be adjusted from 2mA to 20mA to optimise for high dynamic range or low power consumption. The current limit can be set for one or both channels simultaneously using one external resistor, or independently using two resistors. Multiple output configurations are supported, including differential coupling with an output transformer or operational amplifier, or single-ended buffered or unbuffered voltage output.

 

FEATURES Single 3.3V supply Power-down pin Internal or external reference ±0.02% offset error ±0.05% typical gain mismatch

APPLICATIONS Quadrature modulation Direct digital frequency synthesis Medical/test instrumentation Arbitrary-waveform generator Direct-IF applications

 

 

NXP Semiconductors / DAC1401D125