AD8402ARU100-REEL

Overview

The AD8402ARU100-REEL is a dual-channel, 8-bit digital potentiometer from Analog Devices Inc., housed in a 14-lead Thin Shrink Small Outline Package (TSSOP). It features two independent variable resistors with a nominal end-to-end resistance of 100 kΩ and ±20% tolerance. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes a 3-wire SPI-compatible serial interface for data loading at rates up to 10 MHz. Each channel provides 256 tap positions with linear taper characteristics.

Feature Summary

• Dual-channel architecture with 100 kΩ nominal resistance per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces current consumption to less than 5 μA
• Hardware reset (RS) forces wiper to midscale; SHDN pin controls shutdown state

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Programmable filters, delays, and time constant adjustments
• Line impedance matching and power supply voltage trimming

Procurement Notes

Verify the package designation 'RU' corresponds to the TSSOP-14 form factor as specified in the datasheet ordering guide. Confirm that the '100' suffix indicates the 100 kΩ resistance value. Check for automotive qualification requirements if the application demands AEC compliance, as standard industrial versions may differ.

Selection Notes

Select this component when a dual-channel solution is required in a compact surface-mount footprint. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Note that the memory is volatile; initialize the device via hardware reset or software command upon power-up to set known resistance states.

Part Context

This part belongs to the AD840x family, which includes single-channel (AD8400), dual-channel (AD8402), and quad-channel (AD8403) variants. The AD8402 specifically integrates two variable resistors into a single package, offering a balance between channel count and board space efficiency compared to the quad-channel AD8403.

Replacement Considerations

Direct replacements within the same family include other AD8402 variants with different resistance values (e.g., AD8402ARZ10 for 10 kΩ) or packages (e.g., AD8402AR for SOIC-14). Verify pin compatibility and resistance tolerances before substitution.