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Design Idea
Video Design Idea: Leverage PWM output and add a low-cost DAC to your system
Bonnie Baker, senior applications engineer at Texas Instruments and regular EDN columnist, demonstrates a simple way to add DAC functionality to a microcontroller-based system using only an op amp and two passive components.
By Staff -- EDN, 7/19/2007
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Most systems ultimately connect to the real world and the inherently analog nature of that world. A host of analog companies offer data converters just for such interface needs. But look closely at your system design and you may find that you don’t need a dedicated data converter. Indeed a system with a microcontroller that has a PWM (pulse width modulation) output can offer DAC functionality with a simple op amp and a couple of passive components. The low-cost design yields simple programmability and 10-bit accuracy. |
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