AD8402ARZ1-REEL

Overview

The AD8402ARZ1-REEL is a dual-channel digital potentiometer from Analog Devices, featuring two independent 256-position variable resistors in an SOIC-14 package. It operates on a single 2.7 V to 5.5 V supply and accepts a 3-wire SPI-compatible serial interface with a 10 MHz update rate. The nominal resistance options include 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ, with ±1% channel-to-channel matching tolerance. Key features include power shutdown consuming less than 5 μA, a reset pin for midscale positioning, and operation across the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Dual-channel 256-position digitally controlled variable resistor
• SPI-compatible 3-wire serial interface with 10 MHz data loading rate
• Power shutdown mode with current consumption below 5 μA
• Single-supply operation from 2.7 V to 5.5 V

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 resistance value suffix (e.g., 10 for 10 kΩ) required for the application, as the base model number covers multiple resistance variants. Confirm the package type matches the design requirements, noting that the AD8402 is available in SOIC-14 and PDIP-14 packages. Ensure the ordering suffix corresponds to the reel packaging format indicated by REEL in the part number.

Selection Notes

Select the appropriate nominal resistance value based on the circuit's voltage and current constraints. Consider the dynamic characteristics, such as bandwidth and settling time, which vary significantly with resistance value; lower resistance values offer higher bandwidth but may require higher drive currents. Verify that the logic levels of the controlling microcontroller are compatible with the device's input thresholds at the operating supply voltage.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8402 specifically provides two channels, distinguishing it from the single-channel AD8400 and the four-channel AD8403. All parts share similar electrical characteristics and interface protocols, allowing for scalable design within the same product line.

Replacement Considerations

Direct replacements within the same family include the AD8400 for single-channel applications or the AD8403 for quad-channel needs, provided pin compatibility and channel count adjustments are made. Cross-model substitution requires verifying package dimensions and pinout configurations.