The biggest advantage of digital potentiometers compared to mechanical potentiometers is the lifetime of digital potentiometers.
The general mechanical potentiometer has a low service life, and many of them are worn and failed after thousands of uses.
Digital potentiometers are typically in millions of units.
[Digital potentiometer selection]
The selection of digital potentiometer mainly considers the number of potentiometers, the number of slides, that is, the number of stages, the resistance of the resistors, the presence or absence of buffer contacts, the ability to memorize the position when power is off, the package, and so on.
If you need more than one digital potentiometer in your system, you can consider selecting a chip that integrates multiple digital potentiometers, such as CAT5221, CAT5241, etc.
If your system requires a higher resolution of the potentiometer, you can choose a potentiometer with a larger number of sliders, such as CAT5251. Of course, you can also use two digital potentiometers in series to achieve this purpose;
For a potentiometer with a buffer output, the output is a voltage value, not a resistor value, so if it is used for the resistor on the op amp feedback loop, it is not suitable. At this time, you should choose not to have a buffer;
If your system is powered back on, and you want the resistance to recover from the last power-down, choose a non-volatile digital potentiometer;
For varying signals, consider the frequency response related parameters of the device.
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