DS1858B-050

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DS1858B-050 Application Field and Working Principle

Data acquisition is the process of capturing analog and/or digital output from a variety of sources such as sensors, transducers, and processors. One of the components used for this process is the digital potentiometer, and the subject product to discuss is the DS1858B-050 (DS1858) digital potentiometer.

General Description

The DS1858 is an 8-bit, digitally controlled potentiometer (DCP). The DS1858 has an 8-bit fixed point register, a 1024-step resolution, and a minimum of 200kΩ in end-to-end resistance. It has three digital interfaces: I²C, Microwire and SPI. The device is typically used within mixed-signal circuits, substituting for traditional potentiometers.

Application Field

The DS1858 is an ideal choice for any application requiring adjustment and independent setting of multiple critical parameters. This device may be used in EEPROM-programmable systems, automotive audio systems controllers and infinite gain circuits. In addition, it is also suitable for cell phone antennas, industrial and medical instrumentation, power supplies, data converters, and home/vehicle audio systems.

Working Principle

The DS1858 DCP is designed for integration into analog systems for a variety of applications such as: touchpads, digital volume control, gain control, digital potentiometer and many more. It is based on a resistive ladder architecture, coupled with a high-accuracy analog-to-digital converter (ADC) to permit gain setting, wiper-position reading, and digital control. With a resolution of up to 1024 steps, total end-to-end resistance of 200kΩ, and a minimum of 25kΩ at the wiper, the DS1858 is one of the best solutions in the market.

The DS1858 also has an on-chip voltage reference to support 8-bit accuracy, and the device is able to support any reference from 1.2V to 3.2V. This is a significant feature of the DS1858, as it is the only device that supports direct voltage references for the ADC. Additionally, the reference voltage is adjustable, providing a wide range of applications where the reference voltage can be adjusted by the user. This flexibility permits the DCP to be used in applications where the reference voltage needs to be adjusted for different change in range.

The device has three digital interfaces - I2C, Microwire and SPI - that enable communication between the host and the device, and each is capable of supporting up to 9-bit communication, meaning that a host can interface with the device using either 9, 8, or 7 bits of data. This allows the device to interact with a number of different systems.

The DS1858 also supports three types of power management modes, allowing for adjustment of the current consumption of the device for any given application. These are known as Sleep, Standby and Active modes. The Active mode sets the maximum current, while the Standby mode reduces the current to 100µA, while the Sleep mode sets it to 1µA. This feature makes the DS1858 an extremely power-efficient device.

In addition, the DS1858 has a wide operating temperature range of -40°C to +85°C, making it an ideal solution for harsh environmental conditions. The device also has an extremely low power consumption, making it ideal for low-power, battery-operated applications. The device is also RoHS compliant, making it an ideal choice for applications where environmental considerations are paramount.

Finally, the DS1858 has superior linearity and low end-to-end resistance variation. These features make the device a great choice for applications where precision and accuracy are required. The combination of all of these features makes the DS1858 an ideal and versatile digital potentiometer for a wide range of applications.

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