Audio Processor 48-Pin TSSOP

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. proprietary Smart Wiper TM 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 uni polar 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 pseudo stereo 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.

• Audio Processor Including All Op Amps and Pots for Volume, Balance, Mute, Bass, Treble, Ambience, Pseudo stereo, 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
• Click less 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 10kO 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