AD8403AR1

Overview

The AD8403AR1 is a quad-channel, 8-bit digital potentiometer from Analog Devices. It provides four independent variable resistors with 256 tap positions in a 24-lead SOIC package. The nominal resistance is 1 kΩ with a ±20% tolerance and a temperature coefficient of 700 ppm/°C. Operating on a single supply of 2.7 V to 5.5 V, it features a 3-wire SPI-compatible serial interface for data loading at rates up to 10 MHz. Key electrical parameters include a wiper resistance of 100 Ω (at 5 V) or 200 Ω (at 3 V), shutdown current below 5 μA, and an operating temperature range of -40°C to +125°C.

Feature Summary

• Quad-channel architecture with 256-position resolution per channel
• 1 kΩ nominal resistance with linear taper
• SPI-compatible 3-wire serial interface with daisy-chain capability via SDO
• Microwatt power shutdown mode (<5 μA) with latch retention

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 'R' indicates reel packaging when sourcing. Confirm RoHS compliance status as historical records may vary by production batch. Check for End-of-Life (EOL) status or obsolescence notices from Analog Devices prior to final design approval.

Selection Notes

Select this component for applications requiring four independent digitally controlled resistors. Ensure the 1 kΩ value suits the target circuit impedance. Verify that the 700 ppm/°C temperature coefficient meets thermal stability requirements compared to lower-resistance variants like the 10 kΩ version which offers 500 ppm/°C.

Part Context

Part of the AD8400/AD8402/AD8403 family of 1-/2-/4-Channel Digital Potentiometers. The AD8403 specifically denotes the quad-channel configuration housed in 24-lead packages, distinguishing it from the single-channel AD8400 and dual-channel AD8402.

Replacement Considerations

Direct pin-compatible alternatives within the same family include AD8403AR10 (10 kΩ) and AD8403ARZ100 (100 kΩ). For dual-channel needs, consider the AD8402 series. Non-volatile memory variants are not available in this specific family.