AD8402ARZ10

Overview

The AD8402ARZ10 is a dual-channel, 256-position digital potentiometer from Analog Devices Inc., housed in a 14-lead SOIC surface-mount package. It features two independent variable resistors with a nominal resistance of 10 kΩ and a linear taper. 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 specifications 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 unit supports daisy-chaining via a serial data output pin and includes dedicated reset and shutdown control pins.

Feature Summary

• Dual-channel architecture with 256 programmable positions per channel
• SPI-compatible 3-wire serial interface with daisy-chain capability
• Low power shutdown mode consuming less than 5 μA
• Extended industrial operating temperature range from -40°C to +125°C

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 'ARZ10' against the manufacturer's ordering guide to confirm the 10 kΩ resistance value, SOIC-14 package, and RoHS compliance status. Confirm that the 'Z' suffix indicates lead-free packaging as defined by Analog Devices standards. Check for any automotive qualification markings if required for the application environment.

Selection Notes

Select this component when a dual-channel digital solution is required with a 10 kΩ nominal resistance. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V supply range. Consider the 10 MHz update rate and 2 μs settling time for dynamic applications. Verify that the volatile memory type aligns with the requirement to re-initialize the wiper position upon power-up or after a shutdown cycle.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel in an SOIC-8 package and the AD8403 provides four channels in larger packages, the AD8402 specifically integrates two independent variable resistors in a space-saving SOIC-14 form factor. All variants share similar core functionalities including glitch-free switching and identical serial interface protocols.

Replacement Considerations

Direct functional substitutes within the same family include the AD8402ARZ1 (1 kΩ), AD8402ARZ50 (50 kΩ), and AD8402ARZ100 (100 kΩ). For single-channel requirements, the AD8400 series may be considered if pinout compatibility allows. Quad-channel needs can be met by the AD8403 series.