Audio Processor with Pushbutton Interface

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The MAX5406 stereo audio processor provides a complete audio solution with volume, balance, bass, and treble controls. It features dual 32-tap logarithmic potentiometers for volume control, dual potentiometers for balance control, and linear digital potentiometers for tone control. A simple debounced pushbutton interface controls all functions. The MAX5406 advances the wiper setting once per button push. Maxim's proprietary SmartWiper™ control eliminates the need for a microcontroller (µC) to increase the wiper transition rate. Holding the control input low for more than 1s advances the wiper at a rate of 4Hz for 4s and 16Hz thereafter. An integrated click/pop suppression feature eliminates the audible noise generated by the wiper's movements.

The MAX5406 provides a subwoofer output that internally combines the left and right channels. An external filter capacitor allows for a customized cut-off frequency for the subwoofer output. A bass-boost mode enhances the low-frequency response of the left and right channels. An integrated bias amplifier generates the required (VDD + VSS) / 2 bias voltage, eliminating the need for external op amps for unipolar operation.

The MAX5406 also features ambience control to enhance the separation of the left- and right-channel outputs for headphones and desktop speakers systems, and a pseudostereo feature that approximates stereo sound from a monophonic signal.

The MAX5406 is available in a 7mm x 7mm, 48-pin TQFN package and in a 48-pin TSSOP package and is specified over the extended (-40°C to +85°C) temperature range.

MAX5406: Typical Operating Circuit MAX5406: Typical Operating Circuit Enlarge+

Key Features

  • Audio Processor Including All Op Amps and Pots for Volume, Balance, Mute, Bass, Treble, Ambience, Pseudostereo, and Subwoofer
  • 32-Tap Volume Control (2dB Steps)
  • Small, 7mm x 7mm, 48-Pin TQFN and 48-Pin TSSOP Packages
  • Single +2.7V to +5.5V or Dual ±2.7V Supply Operation
  • Clickless Switching and Control
  • Mute Function to < -90dB (typ)
  • Channel Isolation > -70dB (typ)
  • Two Sets of Single-Ended or Differential Stereo Inputs Can Be Used for Summing/Mixing
  • Debounced Pushbutton Interface Works with Momentary Contact Switches or Microprocessors (µPs)
  • Low 0.2µA (typ) Shutdown Supply Current
  • Shutdown Stores All Control Settings
  • 0.02% (typ) THD into 10kΩ Load, 25µVRMS (typ) Output Noise
  • Internally Generated 1/2 Full-Scale Bias Voltage for Single-Ended Applications
  • Power-On Volume Setting to -20dB
  • Internal Passive RF Filters for Analog Inputs Prevent High Frequencies from Reaching the Speakers
  • Applications/Uses

    • Desktop Speakers
    • Flat-Screen TVs
    • Karaoke Machines
    • PDAs or MP3 Player Docking Stations
    • Portable Audio
    Product Reliability Reports: MAX5406.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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