AD8400AR1

Overview

The AD8400AR1 is a single-channel, 8-bit digital potentiometer from Analog Devices. It provides a variable resistance of 1 kΩ with 256 tap positions and linear taper. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V. It features a 3-wire SPI-compatible serial interface for data input and includes a power shutdown mode consuming less than 5 μA. The unit is housed in an SOIC-8 package and supports an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Single-channel 8-bit digital potentiometer with 256 positions
• Nominal resistance of 1 kΩ with ±20% tolerance
• 3-wire SPI-compatible serial interface with 10 MHz update rate
• Power shutdown current less than 5 μA

Applications

• Mechanical potentiometer replacement
• Programmable filters, delays, and time constants
• Volume control and panning
• Line impedance matching
• Power supply adjustment

Procurement Notes

Verify the specific suffix 'R1' against official documentation to confirm the 1 kΩ resistance value and SOIC-8 packaging. Confirm RoHS compliance status as specifications may vary by manufacturing revision. Check for automotive qualification requirements if applicable to the target environment.

Selection Notes

Select this component when a single-channel variable resistor is required. Ensure the 1 kΩ nominal resistance fits the circuit design. Verify that the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Consider the 256-position resolution for required adjustment precision.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8400 variant specifically contains one variable resistor in an SOIC-8 package, whereas other family members offer dual or quad channels in larger packages.

Replacement Considerations

Direct replacements within the same family include the AD8400AR10 (10 kΩ), AD8400AR50 (50 kΩ), and AD8400AR100 (100 kΩ). These share identical pinouts and functionality but differ in nominal resistance values.

FAQ

What is the resolution of the AD8400AR1?

The device offers 8-bit resolution, providing 256 distinct tap positions for resistance adjustment.

How does the power shutdown feature work?

Asserting the SHDN pin forces the resistor to an end-to-end open-circuit condition at Terminal A and shorts the wiper to Terminal B, achieving a microwatt power shutdown state.

What is the maximum continuous current for the 1 kΩ version?

The maximum continuous current for IAB is ±2.1 mA for the 1 kΩ version.