AD8403ARZ1-REEL

Overview

The AD8403ARZ1-REEL 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 an SPI-compatible serial interface for data loading at rates up to 10 MHz. Key electrical characteristics include a typical wiper resistance of 100 Ω at 5 V and a shutdown current below 5 μA.

Feature Summary

• Quad-channel architecture with 256-position resolution per channel
• SPI-compatible 3-wire serial interface with daisy-chain capability via SDO
• Low power shutdown mode consuming less than 5 μA
• Extended industrial temperature range from -40°C to +125°C

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 '1' indicates the 1 kΩ resistance value and 'Z' denotes RoHS compliance. Confirm the '-REEL' designation matches the required tape and reel packaging quantity. Check for automotive qualification requirements if applicable, as the base device family supports this standard.

Selection Notes

Select this component when four independent digitally controlled resistors are needed in a compact surface-mount package. Ensure the 1 kΩ nominal resistance fits the circuit's current and voltage constraints. Verify that the SPI interface timing meets the system's clock speed requirements and that the 8-bit resolution is sufficient for the application's precision needs.

Part Context

This part belongs to 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 interfaces, differing primarily in channel count and package pinout.

Replacement Considerations

Direct replacements within the same family include other AD8403 variants with different resistance values (e.g., AD8403ARZ10 for 10 kΩ). Cross-family replacements require verification of pin compatibility and electrical specifications against the AD8400 or AD8402 series if fewer channels are acceptable.

FAQ

What is the function of the SHDN pin?

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.

How is the wiper position reset?

Asserting the RS (Reset) pin low forces the wiper to midscale by loading the value 80H into the VR latch.

What is the maximum update rate for data loading?

The device supports a 10 MHz update data loading rate via its serial interface.