Wideband Complementary Current Output DAC Single-Ended Interface
High-speed digital-to-analog converters (DACs) most often use a transformer-coupled output stage. In applications where this configuration is not practical, a single op amp
differential to single-ended stage has often been used.
This application note steps through the exact design equations required to achieve gain matching from each output as well as a matched input impedance to each of the DAC current outputs. An example high-speed design is shown using the very wideband, current feedback OPA695 op amp with additional suitable parts included in a summary table. A design spreadsheet program (described in this document) is also available for download.
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