There are two options for using the digital input to control the fine-tuned analog output: potentiometer "> digital potentiometer and digital-to-analog converter (DAC), both of which use digital input to control the analog output. The analog voltage can be adjusted through the digital potentiometer; through the DAC Both current and voltage can be adjusted.
The potentiometer has three analog connection terminals: high end, tap end (or analog output) and low end. The DAC has three corresponding endpoints: the high end corresponds to the positive reference voltage, the tap end corresponds to the DAC output, and the low end may correspond to the ground or negative reference voltage end.
The difference between digital potentiometer and digital-to-analog converter
There are some obvious differences between DACs and digital potentiometers. The most obvious difference is that DACs usually include an output amplifier / buffer, while digital potentiometers do not.
Most digital potentiometers require external buffers to drive low-impedance loads. In some applications, users can easily choose between DAC and digital potentiometer; in some applications, both can meet the needs. This article compares the DAC and the digital potentiometer to facilitate the user to make the most appropriate choice.