AD8400AR10

Overview

The AD8400AR10 is a single-channel, 256-position digital potentiometer from Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a nominal resistance of 10 kΩ with a temperature coefficient of 500 ppm/°C. The device utilizes a 3-wire SPI-compatible serial interface for data input, supporting update rates up to 10 MHz. Key electrical characteristics include a wiper resistance of 100 Ω at 5 V and less than 5 μA shutdown current. It is housed in an 8-lead SOIC package and functions as an electronic replacement for mechanical potentiometers.

Feature Summary

• Single-channel variable resistor with 256 programmable tap positions
• SPI-compatible 3-wire serial interface with 10 MHz data loading rate
• Low power shutdown mode consuming less than 5 μA
• Operates within a 2.7 V to 5.5 V single-supply range

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 component status as the AD8400 series may be subject to discontinuation notices. Confirm that the specific AR10 suffix corresponds to the 10 kΩ resistance value and SOIC-8 package variant required for the design. Ensure compatibility with existing PCB footprints and thermal management requirements for the surface-mount package.

Selection Notes

Select this component when a single-channel digital control is sufficient. The 10 kΩ nominal resistance suits moderate impedance applications. Consider the 500 ppm/°C temperature coefficient for precision requirements. Verify that the volatile memory architecture meets system needs, as settings are lost upon power loss unless retained by external means.

Part Context

The AD8400AR10 belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8402 offers dual channels and the AD8403 provides four channels, the AD8400 specifically integrates a single variable resistor. All variants share similar serial interface protocols and electrical specifications, differing primarily in channel count and package pin configurations.

Replacement Considerations

Direct substitutes within the same family include other AD8400 variants with different resistance values (e.g., AD8400AR1 for 1 kΩ). Cross-model replacements like the AD8402 or AD8403 require additional pins and may not fit the footprint without redesign.