AD8400ARZ1

Overview

The AD8400ARZ1 is a single-channel, 256-position digital potentiometer from Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a nominal resistance of 1 kΩ with a ±20% tolerance. The device utilizes a 3-wire SPI-compatible serial interface for data input, supporting an update rate up to 10 MHz. Key electrical characteristics include a maximum supply current of 0.9 mA under TTL logic conditions and a shutdown current of less than 5 μA. It functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Single-channel variable resistor with 256 programmable positions
• Nominal resistance of 1 kΩ with ±20% tolerance
• 3-wire SPI-compatible serial interface with 10 MHz update rate
• Power shutdown mode consuming 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 resistance value suffix in the part number to ensure it matches the required 1 kΩ specification. Confirm that the SOIC-8 package type aligns with the PCB footprint requirements. Check for automotive qualification if the application demands AEC compliance, as standard versions may differ from qualified variants.

Selection Notes

Select this component when a single-channel digital control is needed to replace mechanical pots. Ensure the system logic levels are compatible with the 2.7 V to 5.5 V operating range. Consider the 1 kΩ resistance value against load requirements, as higher currents may exceed the continuous terminal current limits specified in the datasheet.

Part Context

The AD8400 is part of the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8402 offers dual channels and the AD8403 provides four channels, the AD8400 is specifically designed for single-channel applications. All members share similar serial interface protocols and power management features.

Replacement Considerations

Direct pin-to-pin replacements within the same family include the AD8402 (dual channel) or AD8403 (quad channel), provided unused channels do not interfere with the design. Other single-channel digital potentiometers from different manufacturers require verification of pinout compatibility and electrical parameter alignment.