Application Ideas for Multiplying DACs

Digitally Controlled Gain is Useful in Filter Circuits

The uses of CMOS multiplying DAC's are becoming more widely known and more fully developed as more types with a wider range of resolutions and accuracies have become available and — most important — as prices have rapidly decreased. This family of digital-to-analog converters, sired by the AD7520 in 1973, has an important feature not possessed by many DAC types: they can work with positive or negative reference voltage (for example, an ac analog input) without switching or circuit modification, and with negligible ac feedthrough at frequencies well beyond the audio range. Read full article



John Newell