IC CNTRL VOL STEREO 24-SSOP

 

MAX5440EAG+T

Manufacturer Part NumberMAX5440EAG+T
DescriptionIC CNTRL VOL STEREO 24-SSOP
ManufacturerMaxim Integrated Products
TypeStereo Audio Volume Control
MAX5440EAG+T datasheets

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Specifications of MAX5440EAG+T

ApplicationsAutomotive Systems, Desktop Audio, Set-Top BoxesMounting TypeSurface Mount
Package / Case24-SSOPLead Free Status / RoHS StatusLead free / RoHS Compliant
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19-0542; Rev 2; 11/08
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
DD
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.
Stereo Volume Control
Desktop Speakers
Multimedia Docking Stations
Set-Top Boxes
Automotive Back-Seat Multimedia
Pin Configuration
TOP VIEW
V
1
LOGIC
2
RENCODEB
RENCODEA
3
MUTE
4
MAX5440
MODE
5
6
SHDN
7
GND
8
H0
L0
9
W0
10
MIDBIAS
11
BIAS
12
SSOP
________________________________________________________________ Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Stereo Volume Control
with Rotary Encoder Interface
♦ 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
) / 2) bias voltage,
SS
♦ 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
PART
MAX5440EAG
Applications
V
LOGIC
24
GND
MODEIND
23
22
LEDIND4
LEDIND3
21
20
LEDIND2
LEDIND1
19
18
LEDIND0
17
H1
16
L1
15
W1
14
V
SS
13
V
DD
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
24 SSOP
Typical Operating Circuit
V
V
DD
LOGIC
V
SHDN
MODEIND
PEAK
(V
V
) / 2
DD +
SS
MAX5440
H1
W1
RIGHT INPUT
L1
HEADPHONE
MIDBIAS
DRIVER
(V
V
) / 2
DD +
SS
LEDIND0
LEFT INPUT
L0
LEDIND1
W0
LEDIND2
LEDIND3
H0
LEDIND4
BIAS
V
SS
ROTARY
ENCODER
1

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MAX5440EAG+T Summary of contents

  • Page 1

    ... W0 10 MIDBIAS 11 BIAS 12 SSOP ________________________________________________________________ Maxim Integrated Products For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Stereo Volume Control with Rotary Encoder Interface ♦ Logarithmic Taper Volume Control with (31) 2dB Steps ♦ Low-Power Wiper Buffers Provide 0.003% THD ♦ ...

  • Page 2

    Stereo Volume Control with Rotary Encoder Interface ABSOLUTE MAXIMUM RATINGS SHDN, MUTE, RENCODEA, RENCODEB, and MODE to GND............................-0. H_, L_, and ...............................-0. LEDIND_, MODEIND to GND................-0. MIDBIAS, BIAS to V ...

  • Page 3

    ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V 2.7V ≤ GND T , unless otherwise specified. Typical values are at T MAX PARAMETER SYMBOL Power-Supply Rejection Ratio PSRR Maximum Load Output Resistance ...

  • Page 4

    Stereo Volume Control with Rotary Encoder Interface (T = +25°C, unless otherwise noted.) A ATTENUATION vs. TAP POSITION 0 -10 -20 -30 -40 -50 -60 - TAP POSITION WIPER SWITCHING TRANSIENT ...

  • Page 5

    V = +5V +25°C, unless otherwise noted POWER-SUPPLY REJECTION RATIO vs. FREQUENCY - ±100mV , DD_ P 2.5V, W_ SET TO -6dB L_ -35 -40 ...

  • Page 6

    Stereo Volume Control with Rotary Encoder Interface PIN NAME Digital Logic Power Supply. Bypass LOGIC as possible. Rotary Encoder Input B. With RENCODEA, this input provides the rotary encoder control for the RENCODEB 2 potentiometer (see Figure ...

  • Page 7

    Detailed Description The MAX5440 dual, 40kΩ logarithmic taper digital potentiometer features a debounced up/down interface for use with a simple rotary encoder without using a microcontroller. Each potentiometer has 32 log-spaced tap points with a buffered wiper output and replaces ...

  • Page 8

    Stereo Volume Control with Rotary Encoder Interface In volume-control mode, the MAX5440’s wipers move simultaneously, maintaining the balance separation between each wiper (Figure 2a). When either wiper reaches the maximum tap position (position closest to H_), further commands to increase ...

  • Page 9

    Table 1. Wiper Position and Attenuation POSITION ATTENUATION (dB … 6 (POR) … (MUTE) VOLUME LEVEL IS SET VOLUME LEVEL IS SET Figure 3. ...

  • Page 10

    Stereo Volume Control with Rotary Encoder Interface USER ROTATES ENCODER SWITCH CONTACT IS BOUNCING WIPER MOTION Figure 4a. Wiper Transition Timing Diagram—Suppression Circuitry Active 10 ______________________________________________________________________________________ SWITCH CONTACT IS STABLE INPUT ACCEPTED t WS ...

  • Page 11

    SWITCH CONTACT IS BOUNCING LPW DEBOUNCE BY WAITING FOR STABLE LOW Figure 4b. Wiper Transition Timing Diagram—Timed Out ______________________________________________________________________________________ Stereo Volume Control with Rotary Encoder Interface SWITCH SWITCH CONTACT CONTACT IS STABLE ...

  • Page 12

    Stereo Volume Control with Rotary Encoder Interface The power-on comparators monitor ( GND). A power-on reset is initiated when LOGIC either of the supplies is brought back to the normal operating voltage. The power-on reset feature sets both ...

  • Page 13

    FULL CCW ROTATION (CH0) LED0 ON LED1 ON Figure 5. LED Setting in Balance Mode V LOGIC Figure 6. Dual-Supply Volume/Balance Control ______________________________________________________________________________________ Stereo Volume Control with Rotary Encoder Interface L ...

  • Page 14

    Stereo Volume Control with Rotary Encoder Interface Multiple Button Pushes ( MODE , MUTE ) The MAX5440 does not respond to simultaneous button pushes. Pushing more than one button at the same time stops the wipers in their present states. ...

  • Page 15

    V SHDN LOGIC MAX5440 MUTE L0 GND Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE 24 SSOP A24-1 ______________________________________________________________________________________ ...

  • Page 16

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...

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