AD8403AR10

Overview

The AD8403AR10 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 ±20% tolerance. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V. Each channel provides 8-bit resolution (256 taps) controlled via a 3-wire SPI-compatible serial interface. Key electrical parameters include a maximum wiper contact resistance of 100 Ω at 5 V, a shutdown current of less than 5 μA, and an operating temperature range of −40°C to +125°C.

Feature Summary

• Quad-channel architecture with four independent 10 kΩ variable resistors
• 8-bit resolution providing 256 distinct tap positions per channel
• 3-wire SPI-compatible serial interface supporting daisy-chaining via SDO pin
• Hardware reset (RS) forces wipers to midscale; SHDN pin enables low-power shutdown

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 for the AR suffix, which denotes a wide SOIC-24 surface-mount package. Confirm RoHS compliance status as manufacturing processes evolve. Check for automotive qualification requirements if deploying in AEC-Q100 environments. Ensure logic levels match the target system's VDD range for reliable SPI communication.

Selection Notes

Select this component when four independent digital pots are required in a compact footprint. The 10 kΩ value offers a balance between noise performance and drive capability. Consider the volatile nature of the latches; implement a hardware reset or initial configuration sequence upon power-up to ensure deterministic wiper positions. Verify that the load impedance does not exceed the continuous current limits specified in the datasheet.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8403 specifically provides four channels, whereas the AD8400 offers one and the AD8402 offers two. All variants share similar control logic and electrical characteristics, differing primarily in channel count and package pinout configurations.

Replacement Considerations

Direct functional substitutes within the same family include the AD8403ARZ10 (RoHS compliant version). For different resistance values, consider the AD8403AR50 (50 kΩ) or AD8403AR100 (100 kΩ). Channel count variations require the AD8402 or AD8400.