AD8402AR50

Overview

The AD8402AR50 is a dual-channel, 8-bit digital potentiometer from Analog Devices. It features two independent variable resistors with a nominal resistance of 50 kΩ and 256 tap positions. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes an SPI-compatible 3-wire serial interface for data input. It includes a shutdown mode consuming less than 5 μA and offers linear taper characteristics with a temperature coefficient of 500 ppm/°C.

Feature Summary

• Dual-channel architecture with 256-position resolution
• 50 kΩ nominal resistance with ±1% channel-to-channel matching
• SPI-compatible 3-wire serial interface supporting daisy-chaining
• Microwatt power shutdown state (<5 μA)

Applications

• Mechanical potentiometer replacement
• Programmable filters and time constants
• Line impedance matching

Procurement Notes

Verify the specific package suffix (e.g., ARZ vs. ARU) against the required footprint, as these indicate different physical packages such as SOIC-14 or TSSOP-14. Confirm that the 50 kΩ resistance value aligns with circuit requirements, as other variants exist in 1 kΩ, 10 kΩ, and 100 kΩ ranges.

Selection Notes

Select this component when a dual-channel digital control is needed for high-resistance applications up to 50 kΩ. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Consider the thermal resistance of the chosen package if operating near the upper temperature limits.

Part Context

This part belongs to the AD840x family, which also includes the single-channel AD8400 and quad-channel AD8403. All members share similar electrical characteristics and serial interfaces but differ in channel count and pin configurations.

Replacement Considerations

Direct replacements within the same family include AD8402AR10 (10 kΩ), AD8402AR1 (1 kΩ), and AD8402AR100 (100 kΩ). These parts maintain identical pinouts and functionality while differing only in nominal resistance values.