AD8403AN50

Overview

The AD8403AN50 is a quad-channel, 256-position digital potentiometer from Analog Devices. It provides four independent variable resistors with a nominal resistance of 50 kΩ and a linear taper. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V and features an SPI-compatible 3-wire serial interface for data input. Each channel includes a volatile latch to hold the wiper position. Key electrical characteristics include a maximum wiper resistance of 200 Ω at 3 V operation and a temperature coefficient of 500 ppm/°C. The component is housed in a 24-lead PDIP package.

Feature Summary

• Quad-channel configuration with four independent 50 kΩ variable resistors
• 256-position resolution controlled via SPI-compatible 3-wire serial interface
• Single-supply operation range of 2.7 V to 5.5 V
• Power shutdown mode with current consumption less than 5 μA

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 ordering suffix against the manufacturer's current documentation to confirm package type and tolerance specifications. Confirm end-of-life status or availability through authorized distributors, as manufacturing schedules may change. Ensure compatibility with existing PCB footprints for the 24-lead PDIP package before procurement.

Selection Notes

Select this component when a quad-channel digital solution is required with a 50 kΩ nominal resistance value. The 256-tap resolution is suitable for applications requiring moderate adjustment precision. Verify that the system logic levels are compatible with the 2.7 V to 5.5 V operating range and that the serial interface timing meets the setup and hold requirements specified in the datasheet.

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 into one package. This family shares common architectural features, including the serial interface protocol and shutdown functionality, allowing for scalable design across different channel count requirements.

Replacement Considerations

Direct pin-to-pin replacements within the same family include the AD8403AN10 (10 kΩ), AD8403AN1 (1 kΩ), and AD8403AN100 (100 kΩ). When substituting, ensure the new part matches the required nominal resistance value and that the package style remains compatible with the existing board layout.