AD8403AN10

Overview

The AD8403AN10 is a quad-channel, 256-position digital potentiometer from Analog Devices. It operates on a single 2.7 V to 5.5 V supply and features a 3-wire SPI-compatible serial interface with a 10 MHz update rate. The device provides four independent variable resistors with a nominal resistance of 10 kΩ and a linear taper. Key specifications include a maximum wiper resistance of 100 Ω at 5 V, a temperature coefficient of 500 ppm/°C, and a shutdown current of less than 5 μA. It is housed in a 24-lead PDIP package and supports an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Quad-channel architecture with 256 programmable positions per channel
• SPI-compatible 3-wire serial interface supporting daisy-chaining via SDO pin
• Power shutdown mode reduces supply current to under 5 μA
• Automotive qualified for high-reliability applications

Applications

• Mechanical potentiometer replacement
• Programmable filters, delays, and time constants
• Volume control and panning circuits
• Line impedance matching
• Power supply adjustment

Procurement Notes

Verify the specific suffix AN10 confirms the 10 kΩ resistance value and PDIP package type. Confirm automotive qualification status if required for the target application. Check for end-of-life notices or alternative package options such as SOIC or TSSOP if surface-mount assembly is necessary.

Selection Notes

Select this component when four independent digitally controlled resistors are needed in a single package. Ensure the 10 kΩ nominal resistance aligns with the circuit's impedance requirements. Verify that the 3-wire serial interface timing meets the system's clock speed constraints. Consider the 24-lead PDIP footprint for PCB layout compatibility.

Part Context

The AD8403 is part of 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 channels. All variants share similar electrical characteristics and control interfaces, differing primarily in channel count and package pinout.

Replacement Considerations

Direct replacements within the same family include the AD8403AR (SOIC package) and AD8403AU (TSSOP package). These alternatives maintain identical electrical performance but require different footprints. Cross-family replacements like the AD5204 offer similar functionality but may differ in memory type or accuracy specifications.

FAQ

How does the SHDN pin function?

The SHDN pin forces the resistor to an end-to-end open-circuit condition on the A terminal and shorts the wiper to the B terminal, achieving a microwatt power shutdown state.

What is the resolution of the AD8403AN10?

The device has an 8-bit resolution, providing 256 distinct tap positions for each variable resistor channel.

Can multiple AD8403 devices be connected together?

Yes, the SDO pin allows for simple daisy-chaining of multiple VR applications without additional external decoding logic.