AD8400AR1-REEL

Overview

The AD8400AR1-REEL is a single-channel, 256-position digital potentiometer from Analog Devices. It features a nominal resistance of 1 kΩ with a ±20% tolerance and a temperature coefficient of 700 ppm/°C. Operating on a single supply voltage between 2.7 V and 5.5 V, it utilizes a 3-wire SPI-compatible serial interface for data input at rates up to 10 MHz. The device includes a power shutdown mode drawing less than 5 μA and guarantees monotonic operation. Packaged in SOIC-8, it replaces mechanical potentiometers in applications requiring programmable resistance.

Feature Summary

• Single-channel variable resistor with 256 tap positions
• Nominal resistance of 1 kΩ (±20%) with 700 ppm/°C tempco
• SPI-compatible 3-wire serial interface with 10 MHz clock rate
• Power shutdown current < 5 μA; operates from 2.7 V to 5.5 V

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 tape and reel packaging when sourcing. Confirm the '1' suffix corresponds to the 1 kΩ nominal resistance variant. Check automotive qualification status if required for the specific application environment. Ensure ESD precautions are observed during handling due to CMOS sensitivity.

Selection Notes

Select this component for single-channel applications requiring precise digital control over a 1 kΩ range. Consider the 700 ppm/°C temperature coefficient for thermal stability requirements. Verify that the 2.7 V to 5.5 V supply range matches the system voltage. For higher resistance values, consider the 10 kΩ or 100 kΩ variants within the same family.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8400 specifically denotes the single-channel version housed in an SOIC-8 package. Other family members include the dual-channel AD8402 and quad-channel AD8403, which share similar electrical characteristics but differ in channel count and package options.

Replacement Considerations

Direct replacements within the same family include other AD8400 variants with different resistance values (e.g., AD8400ARZ10). Cross-family replacements like the AD5200 series may require pinout and interface verification. Ensure the substitute supports the required 1 kΩ resistance and SPI compatibility.