DS1868-10+

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The DS1868-10+ is a 10 tap, non-volatile, digitally controlled potentiometer that can be used in a variety of applications for position sensing and for setting different parameters. This dual-channel device is ideal for applications that require high accuracy in a very tight space, allowing for even distribution of the full resistance range across the 0–1KΩ range.

The device features an integrated power-on-reset circuit and includes a communication interface for programming and auto-detection of the device’s position. The DS1868-10+ also includes 10 taps that can be set in 0.0001 increments from the minimum to the maximum. Programming the device is straightforward using the 3-wire SPI-compatible interface which allows both manual and automatic tap selection.

In general, digital potentiometers are designed to make a connection between two or more points, regardless of the type of application, by regulating the resistance between one of these points. As resistance between two points is changed, the principle of Ohm’s law applies and an output voltage is generated. Digital potentiometers are primarily used to adjust the level of input or output signals, or to provide accurate voltage dividers.

Although applications vary, the digital potentiometer is the ideal solution in many situations where precise, adjustable control of voltage ratio is a requirement. It is often used in audio applications such as mixing consoles and equalizers, as a potentiometer replacement that provides precise resistance adjustment over a wide range. It is also used for setting up resistance/gain networks, linear ramp function generators, voltage attenuators, gain control circuits, buffer amplifiers, and instrumentation amplifiers.

The DS1868-10+ is a high-precision, low-power digital potentiometer that consists of a variable resistor and a 10-bit register, both of which are digitally controlled. The variable resistor is controlled by 10 taps separated by 0.10% of full scale, while the register serves as an intermediate volatge buffer that stores the desired resistance setting. The range of the resistance is typically 0–1KΩ with values that can be adjusted in increments as small 0.0001 ‐1KΩ, making the DS1868-10+ the ideal choice when precision, accuracy and reliability are paramount.

Programming the device is done via the 3-wire SPI interface, which allows manual tap selection as well as auto-detection of the device’s position. When power is applied, the power-on-reset circuit will set all registers and internal states to their default condition, allowing for uniformity for each device. This also means that programming time is minimized and data can be stored in the internal register for a period of 10 years.

In conclusion, the DS1868-10+ is an ideal solution for applications where precise, programmable resistance settings are a requirement. This device is useful for adjusting input and output signals, providing precise voltage dividers, and for setting up resistance/gain networks. It comes with an integrated power-on-reset circuit and can be programmed via an SPI interface, allowing for fast, accurate, and reliable response times.

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