Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - Digital potentiometer logarithmic Non-permanent QSOP 16

General Description

The MAX5456/MAX5457 dual, logarithmic taper digital

potentiometers feature a simple pushbutton interface

that controls volume and balance in audio applications.

Each potentiometer has 32 tap points and replaces

mechanical potentiometers. Refer to the MAX5408–

MAX5411 data sheet for SPI versions of the MAX5456/

MAX5457.

Use the MAX5456/MAX5457 digital inputs with momen-

tary contact single-pole/single-throw (SPST) pushbutton

switches. Each input includes internal debounce cir-

cuitry and a 50kΩ pullup resistor.

The MAX5456/MAX5457 advance the wiper setting once

per button push. Maxim’s proprietary SmartWiper™ con-

trol eliminates the need for a microcomputer 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 per second thereafter.

The MAX5456/MAX5457 provide temperature coeffi-

cients of 50ppm/°C end-to-end and 5ppm/°C ratiomet-

ric and a nominal resistance of 10kΩ per potentiometer.

An integrated click/pop suppression feature minimizes

the audible noise generated by wiper transitions. The

typical total harmonic distortion plus noise (THD+N) for

these devices is 0.01%.

The MAX5457 features a 3-button interface with a

MODE input that toggles between volume- and balance-

control modes. An LED output indicates volume or bal-

ance mode. The MAX5456 features a 4-button interface

with separate inputs for up and down volume controls

and left and right balance controls.

The MAX5456/MAX5457 is available in a 16-pin QSOP

packages and specified over the extended (-40°C to

+85°C) temperature range.

Applications

Stereo Volume Control

Fading and Balancing Stereo Signals

Stereo Blending and Mixing

Features

o SmartWiper Control Provides Accelerated Wiper

Motion

o Debounced Pushbutton Interface with Internal

Pullup Resistors

o Logarithmic Taper with 2dB Steps Between Taps

o Single +2.7V to +5.5V or Dual ±2.7V Supply

Operation

o Low 0.5µA Standby Supply Current

o Clickless Switching

o 10kΩ End-to-End Fixed Resistance Value

o Mute Function to -90dB (typ)

o Power-On Reset to -12dB Wiper Position

o 32 Tap Positions for Each Wiper

o Small 16-Pin QSOP Package

MAX5456/MAX5457

Stereo Audio Taper Potentiometers

with Pushbutton Interface

EVALUATION KIT AVAILABLE

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

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

Ordering Information

19-3490; Rev 2; 8/12

Typical Application Circuits and Selector Guide appear at

end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX5456EEE+ -40

C to +85

C 16 QSOP

MAX5457EEE+ -40

C to +85

C 16 QSOP

SmartWiper is a trademark of Maxim Integrated Products, Inc.

TOP VIEW

DN/BAL0

LOGIC

GND

MUTE

MAX5457

QSOP

UP/BAL1

MODE

MODE_IND

SHDN

Pin Configurations

Pin Configurations are continued at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

Note: For leaded version, contact factory.

Summary of content (18 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface General Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 32 tap points and replaces mechanical potentiometers. Refer to the MAX5408– MAX5411 data sheet for SPI versions of the MAX5456/ MAX5457.
PAGE 2
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface ABSOLUTE MAXIMUM RATINGS (MAX5456) SHDN, MUTE, VOLUP, VOLDN, BAL_ to GND.....................................-0.3V to (VLOGIC + 0.3V) (MAX5457) SHDN, MUTE, UP/BAL1, DN/BAL0, MODE, MODE_IND to GND...........................-0.3V to (VLOGIC + 0.3V) H_, L_, and W_ to VSS ..............................-0.3V to (VDD + 0.3 V) VDD to GND ..............................................................-0.3V to +6V VDD to VSS .................
PAGE 3
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface ELECTRICAL CHARACTERISTICS (continued) (VDD = VLOGIC = +2.7V to +5.5V, VSS = 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise specified.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS First Autoincrement Point 1 s First Autoincrement Rate 4 Hz Second Autoincrement Point 4 s Second Autoincrement Rate 16 Hz DIGITAL INPUTS (VLOGIC > 4.
PAGE 4
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Operating Characteristics (VDD = VLOGIC = +2.7V to +5.5V, VSS = 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise specified.) -10 1000 950 900 850 800 750 700 650 END-TO-END RESISTANCE CHANGE (%) 1050 0.5 MAX5456/7 toc02 0 MAX5456/7 toc01 VDD = VLOGIC = 5V ATTENUATION (dB) WIPER RESISTANCE (Ω) 1200 1150 1100 END-TO-END RESISTANCE % CHANGE vs.
PAGE 5
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Operating Characteristics (continued) (VDD = VLOGIC = +2.7V to +5.5V, VSS = 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise specified.) WIPER-TO-END TERMINAL RESISTANCE vs. TAP POSITION STANDBY LOGIC SUPPLY CURRENT 0.15 0.10 0.05 RWH 75 3.2 3.7 4.2 4.7 W_ SET TO 0dB -2 -4 25 W_ SET TO -6dB -6 RWL 0 -8 8 0 5.2 5.5 16 24 32 0.01 0.
PAGE 6
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Pin Description PIN MAX5457 MAX5456 3 — FUNCTION MODE Volume/Balance Control. Each transition from high to low toggles between volume and balance modes. MODE is pulled high internally with a 50kΩ resistor to VLOGIC. On power-up, the MAX5457 is in volume-control mode. Volume-Control/Balance-Control Mode Indicator Open-Drain Output. Connect to an LED through a resistor to VLOGIC.
PAGE 7
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Detailed Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 32 tap points and replaces mechanical potentiometers (see the Functional Diagrams). Up and Down Interface The MAX5456/MAX5457 interface with momentary contact SPST switches.
PAGE 8
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface BALANCE SEPARATION MAINTAINED H_ W0 W1 W0 W1 PRESS VOLUP TWICE W0 W1 W0 W1 PRESS VOLDN ONCE W0 W1 (a) L_ NO CHANGE PRESS VOLUP ONCE H_ W0 W1 W0 W1 PRESS VOLUP (b) L_ H_ W0 W1 PRESS VOLDN ONCE W0 W1 PRESS VOLDN TO 3d (c) L_ ORIGINAL BALANCE SEPARATION MAINTAINED H_ W0 W1 PRESS VOLUP ONCE FROM 3c W0 W1 PRESS VOLUP ONCE W0 W1 (d) L_ Figure 3. Volume-Control Operation Table 1.
PAGE 9
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Balance Control In balance-control mode, the MAX5456/MAX5457 adjust the balance between channel 0 and channel 1 while maintaining the set volume. For example, if the volume of channel 0 equals the volume of channel 1, forcing the balance towards channel 1 increases the attenuation of channel 0 (Figure 4a).
PAGE 10
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Click/Pop Suppression The click/pop suppression feature reduces the audible noise (clicks and pops) that result from wiper transitions. The MAX5456/MAX5457 minimize this noise by allowing the wiper position changes only when VH_ = VL_. Thus, the wiper changes position only when the voltage at L_ is the same as the voltage at the corresponding H_. Each wiper has its own suppression and timeout circuitry (see Figure 5a).
PAGE 11
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Shutdown, SHDN Upon entering shutdown mode, the MAX5456/MAX5457 store the last wiper settings. The wipers move to the L_ end of the resistor string, and the H_ end of the resistor string disconnects from the signal input. Terminating shutdown mode restores the wipers to their previous settings (see Figure 2). Shutdown does not affect the state of MODE_IND.
PAGE 12
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Mode Control, MODE Multiple Button Pushes The MAX5457 MODE input toggles between volumeand balance-control modes. Force MODE low to toggle between volume-control and balance-control modes. For example, driving MODE low once while in volumecontrol mode, switches the MAX5457 to balance-control mode. Driving mode low once again, switches the MAX5457 back to volume-control mode.
PAGE 13
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface VDD VLOGIC VDD LEFT CHANNEL IN SHDN VLOGIC MODE_IND H1 H0 L0 RIGHT CHANNEL IN L1 MAX5457 VDD / 2 VDD / 2 W1 W0 GND VSS MUTE UP/BAL1 DN/BAL0 MODE VDD VDD LEFT AUDIO INPUT RIGHT AUDIO INPUT INL- INL+ SHDN INR+ MAX4494 INR- MAX4494 VDD SVDD PGND MAX9722 OUTL OUTR STEREO HEADPHONE Figure 6.
PAGE 14
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Typical Application Circuit (Single Supply) VDD VPEAK VDD / 2 RLOAD = ∞ VPEAK VDD / 2 H_ RH VDD W_ VPEAK VDD / 2 RL MAX5456/MAX5457 L_ VDD VDD Typical Application Circuit (Dual Supplies) VDD VPEAK 0V RLOAD = ∞ VPEAK 0V H_ RH VDD W_ VPEAK 0V RL MAX5456/MAX5457 VSS L_ VSS = -VDD 14 Maxim Integrated
PAGE 15
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Functional Diagrams VDD VLOGIC SHDN MAX5456 H0 SHUTDOWN SHUTDOWN CLICK/POP SUPPRESSION CIRCUITRY 0 CLICK/POP SUPPRESSION CIRCUITRY 1 1 2 2 3 3 4 H1 0 4 POSITION COUNTER POSITION COUNTER W1 W0 UP/DN UP/DN 28 28 TIMING AND CONTROL T F-F 29 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE 29 DEBOUNCE VLOGIC 30 30 31 31 32 32 MUTE MUTE L1 L0 VSS Maxim Integrated GND VOLUP VOLDN BAL0 BAL1 MUTE 15
PAGE 16
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Functional Diagrams (continued) VDD H0 VLOGIC MODE_IND SHDN MAX5457 SHUTDOWN SHUTDOWN CLICK/POP SUPPRESSION CIRCUITRY 0 CLICK/POP SUPPRESSION CIRCUITRY 0 1 1 2 2 3 3 4 H1 4 POSITION COUNTER POSITION COUNTER W1 W0 UP/DN UP/DN 28 28 TIMING AND CONTROL 29 DEBOUNCE DEBOUNCE T F-F T F-F DEBOUNCE DEBOUNCE VLOGIC 30 30 31 31 32 MUTE 32 MUTE L1 L0 VSS 16 29 GND DN/BAL0 UP/BAL1 MODE MUTE Maxim
PAGE 17
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Pin Configurations (continued) Chip Information PROCESS: CMOS TOP VIEW VOLDN 1 + 16 VDD 15 VLOGIC VOLUP 2 14 GND BAL1 3 BAL0 4 MAX5456 13 VSS H0 5 12 H1 L0 6 11 L1 W0 7 10 W1 9 SHDN 8 MUTE Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 18
MAX5456/MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface Revision History REVISION REVISION NUMBER DATE 0 11/04 2 8/12 DESCRIPTION Initial release Update Ordering Information, Absolute Maximum Ratings, Pin Description, Pin Configuration. Removed Selector Guide and added Package Information table and Revision History.