AD8403ARUZ50-REEL

Overview

The AD8403ARUZ50-REEL is a quad-channel, 256-position digital potentiometer from Analog Devices. It features four independent variable resistors with a nominal end-to-end resistance of 50 kΩ and a linear taper. 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 input. Each channel provides 8-bit resolution, allowing precise resistance adjustment between the wiper and terminal A or B. The component is housed in a 24-lead TSSOP package and is designed for extended industrial temperature operation.

Feature Summary

• Quad-channel configuration with four independent 50 kΩ variable resistors
• 256-position (8-bit) resolution with linear taper
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode with current consumption less than 5 μA

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 'REEL' indicates tape-and-reel packaging when sourcing. Confirm the 'U' designation corresponds to the TSSOP-24 package variant. Ensure compatibility with the 50 kΩ resistance value, as the AD8403 family includes other resistance options. Check for automotive qualification requirements if applicable to the target environment.

Selection Notes

Select this part for applications requiring four digitally controlled resistors in a compact surface-mount package. The 50 kΩ value offers a bandwidth of 125 kHz at -3 dB. Consider the volatile memory nature; hardware reset or software initialization is required upon power-up to set the wiper position. Ensure the system logic levels match the 2.7 V to 5.5 V operating range.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8403 specifically denotes the quad-channel version, distinguishing it from the single-channel AD8400 and dual-channel AD8402. All variants share similar electrical characteristics and interface protocols but differ in channel count and package pinout.

Replacement Considerations

Direct replacements within the same family include AD8403ARZ50-REEL (SOIC-24 package) or AD8403AN50 (PDIP-24 package). Verify that the substitute maintains the 50 kΩ resistance value and the required package footprint for PCB compatibility.