Rainbow-electronics MAX5440 Instrukcja Użytkownika Pobierz pdf

General Description

The MAX5440 dual, 40kΩ logarithmic taper volume con-

trol features a debounced up/down interface for use

with a simple rotary encoder without using a microcon-

troller (µC). Each potentiometer has 32 log-spaced tap

points with a buffered wiper output and replaces

mechanical potentiometers. An integrated bias genera-

tor provides the required ((V

+ V

) / 2) bias voltage,

eliminating the need for costly external op-amp circuits

in unipolar audio applications. A mode-indicator LED

output specifies volume or balance control. Five inte-

grated LED drivers indicate volume level or balance set-

tings, depending on the status of the mode indicator.

The MAX5440 includes debounced pushbutton inputs

for mute and mode. The mute input allows a single

pushbutton to change between volume control and the

-90dB (typ) mute setting. The mode input toggles

between volume and balance control. A click-and-pop

suppression feature minimizes the audible noise gener-

ated by wiper transitions. The MAX5440 provides a

nominal temperature coefficient of 35ppm/°C end-to-

end and 5ppm/°C, ratiometrically. The MAX5440 is

available in a 24-pin SSOP package and is specified for

operation over the -40°C to +85°C extended tempera-

ture range.

Applications

Stereo Volume Control

Desktop Speakers

Multimedia Docking Stations

Set-Top Boxes

Automotive Back-Seat Multimedia

Features

♦ Logarithmic Taper Volume Control with (31) 2dB

Steps

♦ Low-Power Wiper Buffers Provide 0.003% THD

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

Voltage Operation

♦ Low 0.5µA Shutdown Supply Current

♦ Integrated Bias Voltage Generator

♦ Five-Segment LED Volume/Balance Indicator

♦ Clickless Switching

♦ 40kΩ End-to-End Fixed Resistance Value

♦ Mute Function Toggles to -90dB (typ)

♦ Power-On Reset to -12dBFS Wiper Position

MAX5440

Stereo Volume Control

with Rotary Encoder Interface

________________________________________________________________ Maxim Integrated Products 1

GND

MODEIND

LEDIND4

LEDIND3

LOGIC

MUTE

RENCODEB

RENCODEA

TOP VIEW

MAX5440

LEDIND2

LEDIND1

SHDN

LEDIND0

GND

BIAS

MIDBIAS

MODE

SSOP

Pin Configuration

DD +

) / 2

DD +

) / 2

LOGIC

PEAK

SHDN

LEFT INPUT

RIGHT INPUT

MODEIND

HEADPHONE

DRIVER

LOGIC

LEDIND4

LEDIND3

LEDIND0

GND

MUTE

MODE

RENCODEA

LEDIND1

LEDIND2

ROTARY

ENCODER

MIDBIAS

BIAS

MAX5440

Typical Operating Circuit

19-0542; Rev 0; 5/06

Ordering Information

PART TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX5440EAG -40°C to +85°C 24 SSOP A24-1

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.

1 2 3 4 5 6 ... 15 16

Stereo Volume Control 1

Podsumowanie treści

Strona 1 - Stereo Volume Control

General DescriptionThe MAX5440 dual, 40kΩ logarithmic taper volume con-trol features a debounced up/down interface for usewith a simple rotary encoder

Strona 2

MAX5440Stereo Volume Controlwith Rotary Encoder Interface10 ______________________________________________________________________________________0100

Strona 3

MAX5440Stereo Volume Controlwith Rotary Encoder InterfacetHPWINPUT ACCEPTEDWAIT FOR FIRSTZERO CROSSING OR TIMEOUT, tWS2dB STEPStWStLPW(tLPW + tWS)VHVL

Strona 4

MAX5440Power-On ResetThe power-on comparators monitor (VDD- VSS) and(VLOGIC- GND). A power-on reset is initiated wheneither of the supplies is brought

Strona 5

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceFULL LL + 12 L + 6 R + 6 R + 12 FULL RCENTEREDCW ROTATION (CH1) CCW ROTATION (CH0) LED0 ON LE

Strona 6

MAX5440Multiple Button Pushes (MODE, MUTE)The MAX5440 does not respond to simultaneous buttonpushes. Pushing more than one button at the sametime stop

Strona 7

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceFunctional DiagramTIMING AND CONTROLDEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCEPOSITION COUN

Strona 8

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely emb

Strona 9

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cau

Strona 10

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +5.5V, VSS= GND = 0, 2.7V ≤ (VDD- VSS) ≤

Strona 11

MAX5440Stereo Volume Controlwith Rotary Encoder Interface4 _______________________________________________________________________________________Typi

Strona 12

MAX5440Stereo Volume Controlwith Rotary Encoder Interface-75-65-70-45-50-55-60-35-40-25-300.01 10.1 10 100POWER-SUPPLY REJECTION RATIOvs. FREQUENCYMAX

Strona 13

MAX5440Stereo Volume Controlwith Rotary Encoder Interface6 _______________________________________________________________________________________PIN

Strona 14

MAX5440Stereo Volume Controlwith Rotary Encoder InterfaceDetailed DescriptionThe MAX5440 dual, 40kΩ logarithmic taper digitalpotentiometer features a

Strona 15

MAX5440Stereo Volume Controlwith Rotary Encoder Interface8 _______________________________________________________________________________________W0H_

Strona 16

Balance ControlIn balance-control mode, the MAX5440 adjusts the bal-ance between channel 0 and channel 1 while maintain-ing the set volume. For exampl

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Rainbow-electronics MAX5440 Instrukcja Użytkownika

Przeglądaj online lub pobierz Instrukcja Użytkownika dla Akcesoria komputerowe Rainbow-electronics MAX5440. Rainbow Electronics MAX5440 User Manual Instrukcja obsługi

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