AD8402ARU10

Overview

The AD8402ARU10 is a dual-channel, 256-position digital potentiometer from Analog Devices Inc., housed in a 14-lead TSSOP package. It features two independent variable resistors with a nominal resistance of 10 kΩ and ±1% channel-to-channel matching tolerance. 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 temperature coefficient of 500 ppm/°C, and a power shutdown current of less than 5 μA. The component supports an update data loading rate of 10 MHz and functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Dual-channel architecture with 256 programmable positions per resistor
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO
• Low power shutdown mode consuming less than 5 μA
• Single-supply operation compatible with 2.7 V to 5.5 V logic levels

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Programmable filters, delays, and time constants
• Volume control and audio panning circuits
• Line impedance matching applications

Procurement Notes

Verify the specific suffix 'U' confirms the TSSOP-14 package variant during sourcing. Confirm the '10' suffix indicates the 10 kΩ resistance value. Check for automotive qualification requirements if operating in harsh environments, as standard versions may differ from qualified parts. Ensure ESD precautions are observed due to sensitivity.

Selection Notes

Select this model when a dual-channel configuration is required with a 10 kΩ total resistance. The TSSOP-14 package is suitable for surface-mount assembly where space is limited. Consider the 10 MHz update rate for high-speed adjustment needs. Verify that the volatile memory behavior aligns with system power-loss requirements, as settings are lost upon power removal.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8403 provides four channels, the AD8402 specifically delivers two independent variable resistors. All variants share similar serial interface protocols and electrical characteristics, differing primarily in channel count and pin configurations.

Replacement Considerations

Direct substitutes within the same family include the AD8402AR10 (SOIC-14 package) or AD8402AN10 (PDIP-14 package). These alternatives maintain identical electrical specifications but require footprint adjustments due to different package types. Cross-model replacements like the AD8400 or AD8403 offer different channel counts and pinouts.