General Description

The MAX5406 stereo audio processor provides a com-

plete 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 propri-

etary 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 inter-

nally combines the left and right channels. An external

filter capacitor allows for a customized cut-off frequen-

cy 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 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 sys-

tems, 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) tempera-

ture range.

Applications

Automotive Rear-Seat Entertainment (RSE)

Desktop Speakers

Portable Audio

PDAs or MP3 Player Docking Stations

Karaoke Machines

Flat-Screen TVs

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

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

Audio Processor with Pushbutton Interface

________________________________________________________________ Maxim Integrated Products

1

19-3817; Rev 0; 5/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX5406EUM

-40°C to +85°C

48 TSSOP

U48-1

MAX5406ETM*

-40°C to +85°C

48 TQFN

T4877-6

SmartWiper is a trademark of Maxim Integrated Products, Inc.

*Future product—contact factory for availability.

Pin Configurations appear at end of data sheet.