Rainbow-electronics MAX5457 Manual do Utilizador descarregar pdf (Página 1)

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 are available in 16-pin QSOP

and 16-pin TQFN packages and are 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

♦ SmartWiper Control Provides Accelerated Wiper

Motion

♦ Debounced Pushbutton Interface with Internal

Pullup Resistors

♦ Logarithmic Taper with 2dB Steps Between Taps

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

Operation

♦ Low 0.5µA Standby Supply Current

♦ Clickless Switching

♦ 10kΩ End-to-End Fixed Resistance Value

♦ Mute Function to -90dB (typ)

♦ Power-On Reset to -12dB Wiper Position

♦ 32 Tap Positions for Each Wiper

♦ Small 16-Pin QSOP/TQFN Packages

MAX5456/MAX5457

Stereo Audio Taper Potentiometers

with Pushbutton Interface

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3490; Rev 1; 12/05

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.

Typical Application Circuits and Selector Guide appear at

end of data sheet.

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX5456EEE -40

C to +85

C 16 QSOP E16-1

MAX5456ETE* -40

C to +85

C 16 TQFN T1644-4

MAX5457EEE -40

C to +85

C 16 QSOP E16-1

MAX5457ETE* -40

C to +85

C 16 TQFN T1644-4

SPI is a trademark of Motorola, Inc.

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.

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 19 20

MAX5456/MAX5457 1

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General DescriptionThe MAX5456/MAX5457 dual, logarithmic taper digitalpotentiometers feature a simple pushbutton interfacethat controls volume and bal

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MAX5456/MAX5457Stereo Audio Taper Potentiometerswith Pushbutton Interface10 __________________________________________________________________________

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