The DS1867S-50 from Maxim Integrated is a versatile dual digital potentiometer designed to provide a digital solution to analog trimming and variable resistor applications. This integrated circuit (IC) features two digitally controlled potentiometers, each with 256-position wiper settings, enabling precise adjustment of resistance values. It is housed in a compact SOIC-14 package, making it suitable for space-constrained applications.

Key Features

• Wiper Resistance: Each potentiometer in the DS1867S-50 has a wiper resistance as low as 50 ohms, providing a wide range of adjustability and fine control over the output.
• Non-Volatile Memory: The device includes non-volatile (EEPROM) memory to store wiper positions, ensuring that the last settings are retained even after the power is cycled.
• Control Interface: The DS1867S-50 can be controlled via a 3-wire serial interface, which is compatible with standard SPI, QSPI™, and MICROWIRE™ protocols, allowing for easy integration with microcontrollers and other digital systems.
• Operating Voltage: It operates on a supply voltage ranging from 3V to 5.5V, making it suitable for both 3.3V and 5V systems.
• Power-On Recall: Upon power-up, the device recalls the last saved wiper positions from the EEPROM, instantly setting the potentiometers to their previous state.
• Dual Potentiometers: The two potentiometers can be used independently or interconnected for various applications such as volume control, filter adjustment, or feedback circuit tuning.

Applications

The DS1867S-50 is ideal for a range of applications that require precise and programmable resistance adjustments. Common uses include:

• Audio equipment for volume and tone control
• Calibration and tuning of circuits in industrial systems
• Automotive electronics for sensor adjustments
• Programmable power supplies and battery chargers
• Communication devices for impedance matching

Maxim Integrated's DS1867S-50 digital potentiometer offers a reliable and high-precision solution for designers looking to replace mechanical potentiometers with a digital alternative that provides added functionality and ease of use.