AD8402ARUZ10

Overview

The AD8402ARUZ10 is a dual-channel, 256-position digital potentiometer manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a nominal resistance of 10 kΩ with a linear taper. The device utilizes an SPI-compatible 3-wire serial interface for data input, supporting update rates up to 10 MHz. Each channel includes independent variable resistors with volatile latches that retain settings until updated. The component is housed in a 14-lead Thin Shrink Small Outline Package (TSSOP) and is qualified for automotive applications.

Feature Summary

• Dual-channel configuration with 256 programmable tap positions per channel
• SPI-compatible 3-wire serial interface with daisy-chain capability via SDO pin
• Power shutdown mode reduces current consumption to less than 5 μA
• Extended industrial temperature range operation from -40°C to +125°C

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Programmable filters, delays, and time constant adjustments
• Volume control and audio panning circuits
• Line impedance matching and power supply adjustment

Procurement Notes

Verify the specific package type and resistance tolerance against the datasheet before procurement. Confirm that the volatile memory architecture aligns with system requirements, as settings are lost upon power loss. Ensure the design supports the required serial clock speeds and logic levels for reliable communication.

Selection Notes

Select this component when a dual-channel solution is required within a compact TSSOP-14 footprint. The 10 kΩ nominal resistance offers a balance between noise performance and drive capability. Consider the ±1% channel-to-channel matching tolerance if precise differential adjustments are necessary across both channels.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 provides a single channel and the AD8403 offers four channels, the AD8402 specifically addresses applications requiring two independent variable resistors. All variants share similar electrical characteristics and serial interface protocols.

Replacement Considerations

Direct replacements include other members of the AD840x family such as the AD8400 or AD8403, provided the channel count difference is acceptable. Alternative packages like SOIC-14 may be considered if pin compatibility allows, though thermal characteristics will differ.