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Single Bit DACs in a Nutshell | Cypress Semiconductor

Single Bit DACs in a Nutshell

Last Updated: 
Sep 23, 2008

Many embedded applications require generating analog outputs under digital control. It may be a DC reference voltage or an AC signal to stimulate transducers. It may be a reconstructed voice signal for some wireless application. The applications are endless. This function requires a Digital to Analog Converter or DAC.  DACs are cool! They allow analog signals to be generated under CPU control. The name even sounds cool. DAC, the name brings up images of a Clive Clusser adventure. DAC Bit, man of finite resolution!  The number of DACs on single chip systems is always limited, making them a dear resource. One solution is to use onboard digital resources and firmware, along with simple filters to build signal bit DACs. This article will explain the concept of single bit DACs, different techniques to construct them, and the benefits and consequences of each type.