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
â Logarithmic Taper Volume Control with (31) 2dB Steps
â Low-Power Wiper Buffers Provide 0.003% THD
â Single +2.7V to +5.5V or Dual ±2.7V Supply Voltage Operation
â Low 0.5μA Shutdown Supply Current
â Integrated Bias Voltage Generator
â Five-Segment LED Volume/Balance Indicator
â Clickless Switching
â 40kΩ End-to-End Fixed Resistance Value
â Mute Function Toggles to -90dB (typ)
â Power-On Reset to -12dBFS Wiper Position
Applications
â Stereo Volume Control
â Desktop Speakers
â Multimedia Docking Stations
â Set-Top Boxes
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