AD8402ARZ100

Overview

The AD8402ARZ100 is a dual-channel, 8-bit digital potentiometer from Analog Devices. It provides two independent variable resistors with a nominal resistance of 100 kΩ and 256 tap positions. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and features an SPI-compatible serial interface for data loading. Key electrical parameters include a typical wiper resistance of 100 Ω at 5 V, a temperature coefficient of 500 ppm/°C, and a shutdown current of less than 5 μA. It is housed in a 14-lead SOIC package.

Feature Summary

• Dual-channel architecture with 256-position linear adjustment
• SPI-compatible 3-wire serial interface with daisy-chain capability
• Power shutdown mode reducing current consumption below 5 μA
• Extended industrial operating temperature range (-40°C to +125°C)

Applications

• Mechanical potentiometer replacement in automated systems
• Programmable filters, delays, and time constants
• Line impedance matching and power supply adjustment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tolerance. The 'AR' designation typically indicates a surface-mount SOIC package, while 'Z' denotes lead-free status. Confirm availability as this component may be subject to discontinuation or lifecycle changes.

Selection Notes

Select the AD8402ARZ100 when a dual-channel solution with 100 kΩ nominal resistance is required. Ensure the system supports SPI communication and that the 256-step resolution meets the application's precision needs. Consider the 500 ppm/°C temperature coefficient for thermal stability requirements.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8402 variant specifically integrates two independent variable resistors into a compact 14-lead package, distinguishing it from the single-channel AD8400 and quad-channel AD8403.

Replacement Considerations

Direct substitutes within the same family include other resistance values such as AD8402ARZ1 (1 kΩ), AD8402ARZ10 (10 kΩ), and AD8402ARZ50 (50 kΩ). For quad-channel requirements, the AD8403 series is the functional equivalent.