AD5242BRU10

Digital Potentiometers Overview

The AD5242BRU10 is a dual-channel, 256-position digitally controlled variable resistor (digital potentiometer) manufactured by Analog Devices. It features an I²C-compatible serial interface for programming resistance values between terminals A and W or B and W. The device operates on a single supply of 2.7 V to 5.5 V or dual supplies of ±2.7 V. Key electrical parameters include a nominal temperature coefficient of 30 ppm/°C, wiper resistance of 60 Ω to 120 Ω, and 8-bit resolution. It includes internal power-on midscale preset, programmable logic outputs (O1/O2), and a shutdown feature.

Digital Potentiometers Feature Summary

• Dual-channel architecture with 256 positions and 1% channel-to-channel matching tolerance.
• I²C-compatible 2-wire serial interface with readback capability and up to four addressable devices per bus.
• Integrated programmable logic outputs (O1, O2) for driving digital loads or switches.
• Extended temperature range operation from −40°C to +105°C.

Digital Potentiometers Applications

• Gain and offset adjustment in instrumentation circuits.
• Programmable voltage-to-current conversion.
• Line impedance matching in communications systems.
• Mechanical potentiometer replacement in multimedia and audio equipment.

Digital Potentiometers Procurement Notes

Verify the ordering suffix 'RU' corresponds to the 14-lead TSSOP package as specified in the manufacturer's ordering guide. Confirm the '10' suffix indicates the 10 kΩ nominal resistance value. Ensure the component meets RoHS compliance requirements for the specific manufacturing date code.

Digital Potentiometers Selection Notes

Select this model for applications requiring dual independent variable resistors controlled via I²C. The 10 kΩ resistance value suits moderate current applications; higher resistance variants are available if lower power consumption is prioritized. Verify that the system voltage falls within the 2.7 V to 5.5 V range and that the I²C bus speed does not exceed 400 kHz.

Digital Potentiometers Part Context

The AD5242 is part of the AD5241/AD5242 family of I²C-compatible digital potentiometers. While the AD5241 offers a single channel, the AD5242 provides two channels in a compact package. This series serves as a direct electronic replacement for mechanical potentiometers in space-constrained designs requiring digital control.

Digital Potentiometers Replacement Considerations

The AD5241BRU10 is a single-channel equivalent suitable if only one variable resistor is needed. For quad-channel requirements, consider the AD5243 series. Ensure pin compatibility when substituting, as both share the same 14-lead TSSOP footprint and I²C addressing logic.

Digital Potentiometers FAQ

What is the default wiper position upon power-up?

The wiper position defaults to midscale (Code 0x80) at system power-on, simplifying fault condition recovery.

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

Up to four devices can be connected to one bus, determined by the logic states of the AD0 and AD1 pins.

What is the function of the SHDN pin?

The SHDN pin places the RDAC in a low-power shutdown state where Terminal A is open-circuited and the wiper is connected to Terminal B, while maintaining the latch contents.