AD5242BRU100

Digital Potentiometers Overview

The AD5242BRU100 is a dual-channel, 256-position digitally controlled variable resistor (digital potentiometer) manufactured by Analog Devices Inc. It features an I²C-compatible serial interface for programming resistance values between terminals A and W or B and W. The device supports a single-supply voltage range of 2.7 V to 5.5 V or a dual-supply configuration of ±2.7 V. Key electrical specifications include a nominal temperature coefficient of 30 ppm/°C, a wiper resistance of 60 Ω to 120 Ω, and a maximum supply current of 50 µA at 5 V. The unit operates within an extended temperature range of −40°C to +105°C.

Digital Potentiometers Feature Summary

• Dual-channel architecture with 256 programmable positions (8-bit resolution).
• I²C-compatible 2-wire serial interface with readback capability.
• Internal power-on midscale preset for safe initialization.
• Self-contained shutdown feature reducing power consumption to leakage levels.

Digital Potentiometers Applications

• Multimedia, video, and audio signal processing.
• Instrumentation gain and offset adjustment.
• Programmable voltage-to-current conversion circuits.
• Line impedance matching in communication systems.

Digital Potentiometers Procurement Notes

Verify the ordering suffix RU against the manufacturer's official documentation to confirm the specific package type (TSSOP-16) and tape-and-reel packaging details. Ensure the selected variant matches the required nominal resistance value indicated in the part number. Cross-reference the revision level of the datasheet to confirm compatibility with current design specifications.

Digital Potentiometers Selection Notes

Select this component when a dual-channel digital potentiometer with I²C control is required. The BRU suffix indicates a specific surface-mount package; verify pinout compatibility with the PCB footprint. Consider the 100 kΩ nominal resistance value for applications requiring higher impedance than the 10 kΩ variant but lower noise than the 1 MΩ version. Ensure the system voltage falls within the 2.7 V to 5.5 V operating range.

Digital Potentiometers Part Context

The AD5242 is the dual-channel counterpart to the single-channel AD5241. Both share identical functional blocks, register maps, and I²C protocols, allowing for interchangeable software drivers where channel count permits. The series replaces mechanical potentiometers in environments requiring remote programmability and high reliability without moving parts.

Digital Potentiometers Replacement Considerations

The AD5241 serves as a single-channel substitute if only one channel is needed. Verify that any replacement maintains the same I²C address configuration via AD0/AD1 pins and matches the thermal resistance characteristics of the original package.

Digital Potentiometers FAQ

What is the default wiper position upon power-up?

The wiper position defaults to midscale (Code 0x80) during system power-on.

How many devices can be addressed on a single I²C bus?

Up to four devices can be connected to one bus using the programmable AD0 and AD1 address bits.

What is the function of the SHDN pin?

The SHDN pin asynchronously connects the wiper to Terminal B and opens Terminal A, placing the device in a low-power shutdown state while maintaining latch contents.