What are the characteristics of digital potentiometers

Digital potentiometer, also known as numerical control device, is a new type of CMOS integrated circuit for mixed digital and analog signal processing. The digital potentiometer is controlled by digital input and generates analog output.

According to different digital potentiometers, the maximum tap current can range from hundreds of microamps to several milliamps. The digital potentiometer adopts numerical control to adjust the resistance value, which has the remarkable advantages of flexibility, high adjustment accuracy, no contact, low noise, not easy to damage, anti vibration, anti-interference, small size, long service life and so on. It can replace the mechanical potentiometer in many fields.

Digital potentiometers generally have a bus interface, which can be programmed by single chip microcomputer or logic circuit. It is suitable for forming various programmable simulators, such as programmable gain amplifier, programmable filter, programmable linear regulated power supply and tone / volume control circuit, and truly realizes the new design concept of "putting simulators on the bus" (that is, the single chip microcomputer controls the analog function block of the system through the bus).

The product features of digital potentiometer are generally as follows:

1. It is produced based on the sensor principle and has good linearity, accuracy and temperature stability.

2. The function is realized by software, which can be customized according to the use requirements.

3. The working mode is non-contact, avoiding the wear of traditional potentiometers, with long service life and high reliability.

4. Due to the elimination of the brush substrate in the traditional potentiometer, the effective stroke reaches 360 ° and no blind area measurement is realized.

5. There are many types of output signals (0-5v/0-10v/4-20ma/ serial digital signal output), which is convenient for signal acquisition and processing.

6. The change of effective stroke and output signal can be realized by software to meet various special requirements.

7. Wide range of applications, flexible use.

Unlike other potentiometers, the resistance value of digital potentiometers does not change continuously, but has the desired output after adjustment. This is because the digital potentiometer uses MOS tube as the switching circuit and adopts the control method of "opening first and then closing".