AD8402ARU50

Overview

The AD8402ARU50 is a dual-channel, 8-bit digital potentiometer from Analog Devices. It features two independent variable resistors with a nominal resistance of 50 kΩ and 256 tap positions. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes an SPI-compatible 3-wire serial interface for data input. Key electrical parameters include a typical wiper resistance of 100 Ω at 5 V, a power shutdown current of less than 5 μA, and a maximum update rate of 10 MHz. It functions as a mechanical potentiometer replacement in space-constrained applications.

Feature Summary

• Dual-channel architecture with 256-position linear taper resolution
• SPI-compatible 3-wire serial interface supporting daisy-chaining
• Power shutdown mode reduces current consumption below 5 μA
• Operates within a 2.7 V to 5.5 V single-supply range

Applications

• Mechanical potentiometer replacement
• Programmable filters, delays, and time constants
• Volume control and panning circuits
• Line impedance matching
• Power supply adjustment

Procurement Notes

Verify the package type associated with the 'U' suffix against official documentation, as it typically denotes TSSOP. Confirm that the specific 50 kΩ variant matches the required nominal resistance and tolerance specifications for the target design. Ensure compatibility with the system's serial clock rates and logic voltage levels.

Selection Notes

Select this component when a dual-channel solution is required to replace mechanical pots. The 50 kΩ value offers a balance between bandwidth and noise performance compared to lower or higher resistance variants. Consider the TSSOP-14 package dimensions if PCB real estate is limited. Verify that the volatile memory requirement aligns with the application's need to restore settings upon power-up.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 provides a single channel and the AD8403 provides four, the AD8402 specifically integrates two independent channels. All members share similar control interfaces and architectural features, differing primarily in channel count and pin configurations.

Replacement Considerations

Direct replacements within the same family include other AD8402 variants with different resistance values (e.g., AD8402ARZ10 for 10 kΩ). For single-channel needs, the AD8400 series may be suitable. Quad-channel requirements can be met by the AD8403 series. Ensure the substitute maintains the required resistance tolerance and package footprint.