AD8403ARU10

Overview

The AD8403ARU10 is a quad-channel, 256-position digital potentiometer from Analog Devices. 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 temperature coefficient of 500 ppm/°C. The device utilizes a 3-wire SPI-compatible serial interface for data loading at rates up to 10 MHz. Each channel includes volatile memory, requiring initialization upon power-up. The component is housed in a 24-lead TSSOP package and supports an extended industrial operating temperature range from -40°C to +125°C.

Feature Summary

• Quad-channel architecture with 256 tap positions per variable resistor
• SPI-compatible 3-wire serial interface with daisy-chain capability via SDO pin
• Hardware reset (RS) forces wipers to midscale; shutdown mode reduces current below 5 μA
• Linear taper with ±1% channel-to-channel matching tolerance

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet revision. Confirm that the 'RU' designation corresponds to the TSSOP-24 package variant required for the design. Check for automotive qualification status if the application demands AEC compliance, as standard commercial grades may differ in reliability specifications.

Selection Notes

Select this component when four independent digitally controlled resistors are needed within a single IC footprint. Ensure the system can handle volatile memory behavior by implementing a hardware reset or software initialization sequence after power-on. Verify that the load currents remain within the continuous terminal limits specified for the 10 kΩ version to prevent device damage.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8400 offers a single channel and the AD8402 provides dual channels, the AD8403 integrates four independent variable resistors. All variants share identical electrical characteristics and control interfaces, differing primarily in channel count and package pinout configurations.

Replacement Considerations

Direct functional substitutes include other quad-channel digital potentiometers from Analog Devices such as the AD8403ARZ10. When replacing, ensure the new component matches the 24-lead TSSOP package dimensions and maintains compatibility with the existing SPI communication protocol and voltage levels.