The AD8402 from Analog Devices Inc. is a dual-channel, 256-position, digitally controlled variable resistor (VR) device. This compact and versatile digital potentiometer is designed to operate as a true potentiometer replacement with a typical end-to-end resistance of 10 kΩ, 50 kΩ, or 100 kΩ. It offers a convenient solution for adjusting and controlling resistance in a wide range of applications, from automated adjustments to programmable controls and settings.

Key Features

• Dual 8-bit Resistor Network: The AD8402 features two independent variable resistors, providing flexibility for dual control applications.
• User-Selectable Range: With options for nominal resistance values of 10 kΩ, 50 kΩ, or 100 kΩ, the device can be tailored to meet specific application requirements.
• Serial Interface: The integrated 3-wire SPI-compatible serial interface ensures easy communication with microcontrollers and digital systems.
• Non-volatile Memory: Each variable resistor setting is stored in non-volatile memory, ensuring resistance settings are maintained even after power-off.
• Wide Operating Voltage: The AD8402 operates over a broad voltage range from 2.7 V to 5.5 V, making it suitable for both 3 V and 5 V systems.
• Low Temperature Coefficient: The device features a low temperature coefficient, which minimizes resistance variation across a wide temperature range.
• Compact Packaging: Available in narrow SOIC and TSSOP surface-mount packages, the AD8402 is designed for space-constrained applications.

Applications

The versatility of the AD8402 makes it an ideal choice for various applications that require precise and programmable resistance adjustments. These include:

• Adjustable power supplies
• LCD screen brightness and contrast controls
• Audio/Video equipment tuning
• Automotive electronics adjustments
• Calibration and trimming systems
• Industrial process control systems

In summary, the AD8402 digital potentiometer from Analog Devices Inc. offers designers a highly reliable and flexible component for precision resistance tuning in a multitude of electronic applications.