AD8402ARUZ50

Overview

The AD8402ARUZ50 is a dual-channel, 8-bit digital potentiometer from Analog Devices. It provides 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. It features an SPI-compatible serial interface for data loading at rates up to 10 MHz. Key electrical characteristics include a typical wiper resistance of 100 Ω at 5 V supply, a temperature coefficient of 500 ppm/°C, and a power shutdown current of less than 5 μA. The component is housed in a 14-lead TSSOP package.

Feature Summary

• Dual-channel architecture with 256-position variable resistance
• SPI-compatible 3-wire serial interface with daisy-chain capability
• Power shutdown mode consuming less than 5 μA
• Single-supply operation between 2.7 V and 5.5 V

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 specific suffix 'U' indicates the TSSOP-14 package and 'Z' denotes lead-free compliance. Confirm the '50' suffix corresponds to the 50 kΩ nominal resistance value. Ensure the source document matches the Rev E datasheet specifications for the AD8402 family.

Selection Notes

Select this component when replacing mechanical pots in space-constrained designs requiring dual channels. The 50 kΩ resistance value suits moderate impedance applications. Verify that the system logic levels are compatible with the 2.7 V to 5.5 V operating range and that the 8-bit resolution meets the required adjustment precision.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8403 provides four, the AD8402 specifically integrates two independent variable resistors. All variants share similar control interfaces and electrical characteristics, differing primarily in channel count and package options.

Replacement Considerations

Direct substitutes within the same family include the AD8402ARZ50 (SOIC-14 package) or the AD8402ARU100 (100 kΩ variant). When replacing, ensure the new part matches the required resistance value and package footprint, as pinouts remain consistent across the AD8402 series.