AD8400AR100

Overview

The AD8400AR100 is a single-channel, 256-position digital potentiometer from Analog Devices. It features a nominal resistance of 100 kΩ with a ±20% tolerance and a temperature coefficient of 500 ppm/°C. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V. It utilizes an SPI-compatible 3-wire serial interface for data input, allowing for programmable resistance adjustment between terminals A and B via the wiper. The component is housed in an SOIC-8 surface-mount package.

Feature Summary

• Single-channel variable resistor with 256 tap positions
• Nominal resistance of 100 kΩ with linear taper
• SPI-compatible 3-wire serial interface
• Power shutdown mode with less than 5 μA current consumption

Applications

• Mechanical potentiometer replacement
• Programmable filters and time constants
• Line impedance matching

Procurement Notes

Verify the specific suffix '100' indicates the 100 kΩ resistance value. Confirm the package type matches the design requirements, as the standard AD8400 typically uses SOIC-8. Check for RoHS compliance status and ensure the operating temperature range meets the application's environmental needs.

Selection Notes

Select this part when a single-channel digital control of a 100 kΩ resistance is required. Ensure the system supports the 3-wire SPI interface. Consider the 100 kΩ value against the bandwidth requirements, as higher resistance results in lower bandwidth compared to lower resistance variants.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8402 offers dual channels and the AD8403 provides four channels, the AD8400 variant specifically integrates a single variable resistor channel within a compact footprint, simplifying board space requirements for single-pot applications.

Replacement Considerations

Direct replacements include other AD8400 variants with different resistance values (e.g., AD8400AR10 for 10 kΩ) if the resistance specification allows modification. Cross-model substitution with AD8402 or AD8403 is possible if unused channels are acceptable.