AD8403ARU1-REEL

Overview

The AD8403ARU1-REEL is a quad-channel, 256-position digital potentiometer from Analog Devices. It features four independent variable resistors with a nominal resistance of 1 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 control over resistance values between the wiper and end terminals. The component is housed in a 24-lead TSSOP package and is designed for applications requiring mechanical potentiometer replacement in space-constrained environments.

Feature Summary

• Quad-channel configuration with four independent 256-position variable resistors
• 1 kΩ nominal resistance with ±1% channel-to-channel matching tolerance
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces current consumption to 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 'RU' corresponds to the TSSOP-24 package and '1' indicates the 1 kΩ resistance value. Confirm that the '-REEL' designation matches the required tape and reel packaging quantity for production integration. Check for automotive qualification requirements if the application demands AEC compliance, as standard versions may differ from qualified variants.

Selection Notes

Select this component when a quad-channel digital solution is required with low resistance values around 1 kΩ. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Consider the 10 MHz update rate if high-speed code changes are necessary. Verify that the thermal characteristics of the TSSOP-24 package are sufficient for the expected power dissipation in the target environment.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8402 provides dual channels, the AD8403 integrates four channels in a compact surface-mount package. The 'ARU' prefix denotes the industrial temperature range (-40°C to +125°C) and the TSSOP-24 package type, distinguishing it from PDIP or SOIC variants within the same series.

Replacement Considerations

Direct replacements include other AD8403 variants with different resistance values (e.g., AD8403ARZ10 for 10 kΩ) or packages. Cross-family alternatives like the AD5204 offer similar functionality but may have different pinouts or performance specifications. Verify pin compatibility and electrical parameters before substituting.