AD8403AR10-REEL

Overview

The AD8403AR10-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 supports an industrial temperature range of −40°C to +125°C. It utilizes a 3-wire SPI-compatible serial interface with a maximum clock rate of 10 MHz for data loading. Each channel includes volatile latches that retain settings until updated or reset.

Feature Summary

• Quad-channel architecture with 256 programmable tap positions per resistor
• 10 kΩ nominal resistance with ±1% inter-channel matching tolerance
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Hardware Reset (RS) forces wipers to midscale; Shutdown (SHDN) reduces current to <5 μA

Applications

• Mechanical potentiometer replacement in harsh environments
• Programmable filters, delays, and time constant adjustments
• Line impedance matching circuits
• Power supply voltage adjustment

Procurement Notes

Verify the specific suffix 'REEL' indicates tape-and-reel packaging suitable for automated assembly. Confirm the '10' designation corresponds to the 10 kΩ resistance variant. Check for RoHS compliance status as manufacturing sites may vary. Ensure the SOIC-Wide-24 package dimensions match the target PCB footprint requirements.

Selection Notes

Select this component when four independent digitally controlled resistors are required in a single package. The 10 kΩ value offers a balance between bandwidth and noise performance compared to higher resistance variants. Ensure the application can accommodate volatile memory behavior, requiring initialization upon power-up. Verify that the load currents do not exceed the ±2.1 mA continuous terminal current limit.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of 1-, 2-, and 4-channel digital potentiometers. The AD8403 specifically provides the quad-channel configuration in 24-lead packages. Other variants in the series include the AD8400 (single channel) and AD8402 (dual channel), which share similar electrical characteristics but differ in pin count and channel density.

Replacement Considerations

Direct functional replacements within the same family include the AD8403ARZ10-REEL, which denotes RoHS-compliant construction. Cross-model alternatives like the AD8402 or AD8400 offer fewer channels and require different pin configurations.