MAX5406 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Audio Processor with Pushbutton Interface

19-3817; Rev 0; 5/06
Audio Processor with Pushbutton Interface
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 required (V_DD + V_SS) / 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 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
♦ 0.02% (typ) THD into 10kΩ Load, 25µV_RMS (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
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX5406EUM -40°C to +85°C 48 TSSOP
MAX5406ETM* -40°C to +85°C 48 TQFN
*Future product—contact factory for availability.
Pin Configurations appear at end of data sheet.
PKG
CODE
U48-1
T4877-6
SmartWiper is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.