AD8400ARZ100

Overview

The AD8400ARZ100 is a single-channel, 8-bit digital potentiometer from Analog Devices. It provides a variable resistance of 100 kΩ with 256 tap positions controlled via an SPI-compatible serial interface. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a power shutdown mode consuming less than 5 μA. It includes a reset pin for midscale positioning and supports daisy-chaining through a serial data output pin.

Feature Summary

• Single-channel 100 kΩ variable resistor with 256 linear tap positions
• SPI-compatible 3-wire serial interface with 10 MHz update rate
• Power shutdown mode reduces current consumption below 5 μA
• Active low reset forces wiper to midscale (80H)
• Extended industrial temperature range: -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 '100' indicates the 100 kΩ nominal resistance value. Confirm the package type matches the design requirements, as the AD8400 family offers various packages including SOIC-8. Check for automotive qualification if operating in harsh environments. Ensure ESD precautions are taken during handling due to sensitivity.

Selection Notes

Select this component when a single-channel digital potentiometer with 100 kΩ resistance is required. Consider the AD8402 or AD8403 if multiple channels are needed. Verify that the 256-position resolution meets the application's precision needs. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range.

Part Context

The AD8400 is part of the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. These devices replace mechanical potentiometers in space-constrained applications. The family shares common features like SPI compatibility and low power shutdown, differing primarily in channel count and package options.

Replacement Considerations

Direct replacements include other AD8400 variants with different resistance values (e.g., AD8400ARZ10 for 10 kΩ). For multi-channel needs, consider AD8402 (dual) or AD8403 (quad). Ensure pinout compatibility if substituting within the same package type.