AD8403ARZ10-REEL

Overview

The AD8403ARZ10-REEL is a quad-channel, 256-position digital potentiometer from Analog Devices. It features four independent variable resistors with a nominal end-to-end resistance of 10 kΩ and ±1% channel-to-channel matching tolerance. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and utilizes a 3-wire SPI-compatible serial interface for data loading at rates up to 10 MHz. Each channel provides 8-bit resolution, allowing precise linear adjustment of resistance between the wiper and either endpoint. The component includes hardware reset and shutdown capabilities to minimize power consumption and ensure predictable initial states.

Feature Summary

• Quad-channel architecture with four independent 10 kΩ variable resistors
• 8-bit resolution providing 256 distinct tap positions per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces current consumption to less than 5 μA

Applications

• Mechanical potentiometer replacement in industrial systems
• Programmable filters, delays, and time constant adjustments
• Line impedance matching and power supply voltage trimming

Procurement Notes

Verify the specific package variant, as the AD8403 family includes SOIC-24, TSSOP-24, and PDIP-24 options. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the target system's voltage levels and temperature requirements before finalizing procurement.

Selection Notes

Select this component when multiple independent digital resistance controls are required within a single footprint. The 10 kΩ value offers a balance between noise performance and drive capability. Consider the volatile nature of the internal latches; implement a hardware reset circuit if a known mid-scale state is required upon power-up.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digitally controlled variable resistors. While the AD8400 contains one channel and the AD8402 contains two, the AD8403 integrates four channels into a 24-lead package. All variants share similar electrical characteristics and interface protocols, differing primarily in channel count and physical package dimensions.

Replacement Considerations

Direct functional replacements include other quad-channel digital potentiometers from Analog Devices or competitors offering 256-position SPI interfaces. Verify pinout compatibility, particularly regarding the placement of analog ground pins and the shutdown control signal, to ensure seamless integration without PCB redesign.