AD8402ARZ50-REEL

Overview

The AD8402ARZ50-REEL is a dual-channel, 8-bit digital potentiometer from Analog Devices. It provides two independent variable resistors with a nominal resistance of 50 kΩ and 256 tap positions. The device operates on a single supply voltage between 2.7 V and 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, a temperature coefficient of 500 ppm/°C, and a power shutdown current of less than 5 μA. The component is housed in a surface-mount package.

Feature Summary

• Dual-channel architecture with 256-position variable resistance
• SPI-compatible 3-wire serial interface with daisy-chain capability
• Power shutdown mode consuming less than 5 μA
• Single-supply operation ranging 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 ordering suffix against the manufacturer's official documentation to confirm the packaging type and resistance tolerance. Ensure that the selected variant matches the required thermal and electrical specifications for the target application environment.

Selection Notes

Select this component when a dual-channel solution is required within a compact surface-mount footprint. The 50 kΩ nominal resistance is suitable for applications requiring moderate impedance levels. Verify compatibility with the system's logic voltage levels, as the device supports both 3 V and 5 V CMOS/TTL inputs.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digital potentiometers. The AD8402 specifically denotes the dual-channel configuration, distinguishing it from the single-channel AD8400 and the quad-channel AD8403. All variants share similar functional block diagrams and serial interface protocols.

Replacement Considerations

Direct replacements within the same family include other AD8402 variants with different resistance values or packaging options. Cross-family substitution requires verification of pin compatibility and electrical parameter alignment.

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 does the reset (RS) pin operate?

The active-low RS pin forces the wiper to midscale by loading the value 80H into the VR latch.

Is the device monotonic?

Yes, the devices are guaranteed to be monotonic, meaning the output resistance increases or decreases monotonically with the input code.