MAX5408ETE+

Overview

The MAX5408ETE+ is a dual, logarithmic taper digital potentiometer from Analog Devices/Maxim Integrated. It features two independent 10kΩ resistive elements with 32 tap positions each and one wiper per element. The device operates on a single supply voltage of +2.7V to +3.6V and utilizes an SPI-compatible serial interface for control. Key electrical characteristics include a nominal end-to-end resistance temperature coefficient of 35ppm/°C, a ratiometric coefficient of 5ppm/°C, and a standby supply current of 0.5µA. It includes zero-crossing detection to minimize audible noise during transitions and a mute function providing -90dB attenuation.

Feature Summary

• Dual logarithmic taper digital potentiometers with 32-tap positions and 2dB steps between taps
• Single-supply operation (+2.7V to +3.6V) with low standby current (0.5µA)
• Zero-crossing detection feature minimizes audible clicks and pops during wiper transitions
• Mute function provides -90dB attenuation; Power-On Reset sets wipers to maximum attenuation (-62dB)

Applications

• Stereo volume control in audio systems
• Fading and balancing stereo signals
• Replacement for mechanical potentiometers in audio applications

Procurement Notes

Verify the component is the MAX5408 variant, which supports a supply range of 2.7V to 3.6V. Confirm the 'E' suffix indicates the Thin QFN package and '+' denotes RoHS compliance. Ensure the application circuit matches the specified voltage limits and does not require the dual-wiper configuration found in the MAX5409.

Selection Notes

Select this part when a logarithmic response is required for audio attenuation rather than linear adjustment. Verify that the system voltage remains within the 2.7V to 3.6V range, as higher voltages require the MAX5410 variant. Consider the 32-tap resolution and 10kΩ fixed resistance value against the specific impedance requirements of the connected op-amp circuits.

Part Context

The MAX5408ETE+ belongs to the MAX5408–MAX5411 family of dual audio digital potentiometers. It is distinguished by its single-wiper-per-potentiometer configuration and lower voltage operating range compared to the MAX5410/MAX5411. The ETE suffix specifically identifies the 16-pin Thin QFN package version intended for surface-mount assembly.

Replacement Considerations

The MAX5408EEE+ serves as a pin-compatible replacement using the QSOP package. For applications requiring dual wipers or higher voltage operation (4.5V to 5.5V), the MAX5409ETE+ or MAX5410ETE+ must be selected respectively, noting differences in pinout and supply constraints.