AD8400ARZ10

Overview

The AD8400ARZ10 is a single-channel, 256-position digitally controlled variable resistor (VR) from Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features an SPI-compatible serial interface with a maximum clock rate of 10 MHz. The nominal end-to-end resistance is 10 kΩ with a temperature coefficient of 500 ppm/°C. Key electrical specifications include a typical shutdown current of less than 5 μA, a settling time of 2 μs, and a -3 dB bandwidth of 600 kHz. The device utilizes a unique switching circuit to minimize glitches during wiper transitions.

Feature Summary

• Single-channel digital potentiometer with 256 programmable tap positions
• SPI-compatible 3-wire serial interface supporting up to 10 MHz clock rates
• Low power consumption with shutdown current below 5 μA
• Extended industrial operating temperature range from -40°C to +125°C

Applications

• Mechanical potentiometer replacement in harsh environments
• Programmable filters, delays, and time constants
• Line impedance matching circuits
• Power supply adjustment controls

Procurement Notes

Verify the specific suffix 'ARZ10' against the manufacturer's ordering guide to confirm the package type, resistance value, and RoHS compliance status. Confirm that the source document explicitly lists this part number as active or available for procurement, as availability may vary by region.

Selection Notes

Select the AD8400ARZ10 when a single variable resistor channel is required within a compact SOIC-8 footprint. Ensure the application requires a nominal 10 kΩ resistance and can accommodate a 500 ppm/°C temperature coefficient. Verify that the system logic levels are compatible with the 2.7 V to 5.5 V supply range and SPI interface requirements.

Part Context

This component belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. While the AD8402 offers dual channels and the AD8403 provides four channels, the AD8400 specifically integrates a single variable resistor. All variants share similar control logic and electrical characteristics but differ in pin count and channel independence.

Replacement Considerations

Direct functional replacements within the same family include the AD8402ARZ10 for dual-channel applications and the AD8403ARZ10 for quad-channel configurations. Cross-family replacements require verification of pin compatibility, resistance tolerance, and interface signaling protocols.