DS1802

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Data acquisition is the process of measuring an electric signal and converting it into a digital form that can be read, gathered, recorded, and analyzed using a computer. Digital Potentiometers are a type of data acquisition device used to measure and adjust electrical resistance. One example of a digital potentiometer is the DS1802, which was developed by Dallas Semiconductor Corporation (now a part of AnalitikJena Corporation). It is a dual-channel, non-volatile, digitally adjustable potentiometer.

The DS1802 is a CMOS device that uses a 3-wire SPI (serial peripheral interface) to communicate with the host system. It is designed to adjust the wiper voltage between the end terminals. The wiper output can be adjusted from 0V to Vref (where Vref can range from 2.5V to 5V). The DS1802 also has two non-volatile channels that each offer 256 resistance steps, with resolutions ranging from 128 steps to 8 steps.

The DS1802 has a wide range of applications. It can be used for remote gain and offset trimming, PLL (phase-locked loop) loop filter control, motion detection, and noise sampling. It can also be used in digital readout systems, such as those used in medical imaging and industrial test systems, as well as in audio applications. It is a great way to adjust the behavior of an electronic system without the need to modify the hardware.

The working principle of the DS1802 is quite simple. When a voltage is applied to the device, it creates a resistance between the two terminals. The resistance can be adjusted by changing the voltage applied to the device. By sending a 3-wire digital signal to the device, the resistance can be changed in 8 or 128 steps, depending on the resolution. The wiper output can also be adjusted to limit the maximum voltage that can be output.

In summary, the DS1802 is a versatile digital potentiometer that can be used in a wide range of data acquisition applications. It uses a 3-wire SPI to communicate with the host system, and allows precise adjustment of the resistance between the two terminals. It is a great way to adjust the behavior of an electronic system without the need to modify the hardware.

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