General Description

The MAX5440 dual, 40kΩ logarithmic taper volume control features a debounced up/down interface for use with a simple rotary encoder without using a microcontroller (μC). Each potentiometer has 32 log-spaced tap points with a buffered wiper output and replaces mechanical potentiometers. An integrated bias generator provides the required ((VDD + VSS)/2) bias voltage, eliminating the need for costly external op-amp circuits in unipolar audio applications. A mode-indicator LED output specifies volume or balance control. Five integrated LED drivers indicate volume level or balance settings, depending on the status of the mode indicator.

Features

● Logarithmic Taper Volume Control with (31) 2dB Steps

● Low-Power Wiper Buffers Provide 0.003 THD

● Single +2.7V to +5.5V or Dual ±2.7V Supply Voltage Operation

● Low 0.5μA Shutdown Supply Current

● Integrated Bias Voltage Generator

● Five-Segment LED Volume/Balance Indicator

● Clickless Switching

● 40kΩ End-to-End Fixed Resistance Value

● Mute Function Toggles to -90dB (typ)

● Power-On Reset to -12dBFS Wiper Position

Applications

● Stereo Volume Control

● Desktop Speakers

● Multimedia Docking Stations

● Set-Top Boxes