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PDF MAX5440 Data sheet ( Hoja de datos )
| Número de pieza | MAX5440 | |
| Descripción | Stereo Volume Control | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX5440 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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19-0542; Rev 1; 5/06
Stereo Volume Control
with Rotary Encoder Interface
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 ((VDD + VSS) / 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
Pin Configuration
TOP VIEW
VLOGIC 1
RENCODEA 2
RENCODEB 3
MUTE 4
MODE 5
SHDN 6
GND 7
H0 8
L0 9
W0 10
MIDBIAS 11
BIAS 12
MAX5440
SSOP
24 GND
23 MODEIND
22 LEDIND4
21 LEDIND3
20 LEDIND2
19 LEDIND1
18 LEDIND0
17 H1
16 L1
15 W1
14 VSS
13 VDD
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5440EAG -40°C to +85°C 24 SSOP
PKG
CODE
A24-1
Typical Operating Circuit
VDD VLOGIC
VLOGIC
SHDN
MAX5440
(VDD + VSS) / 2
LEDIND0
LEDIND1
LEDIND2
LEDIND3
LEDIND4
VSS
MODEIND
VPEAK
(VDD + VSS) / 2
H1
W1
RIGHT INPUT
L1
MIDBIAS
HEADPHONE
DRIVER
L0 LEFT INPUT
W0
H0
BIAS
ROTARY
ENCODER
________________________________________________________________ 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.
1 page  
Stereo Volume Control
with Rotary Encoder Interface
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-25
-30
VDD_ = 5V ±100mVP-P, VH = 5V
VL_ = 2.5V, W_ SET TO -6dB
-35
-40
-45
-50
-55
-60
-65
-70
-75
0.01
0.1 1 10
FREQUENCY (kHz)
100
LOGIC SUPPLY CURRENT
vs. LOGIC SUPPLY VOLTAGE
300
250
ACTIVE CURRENT
200
150
100
50 SHUTDOWN
STANDBY CURRENT
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
LOGIC SUPPLY VOLTAGE (V)
ACTIVE LOGIC SUPPLY CURRENT
vs. TEMPERATURE
350
VDD = VLOGIC = 5.5V,
300 RENCODEA = RENCODEB = 0
250
200
150
100
50
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
1.1770
1.1768
1.1766
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
VDD = VLOGIC = 5.5V,
RENCODEA = RENCODEB = 0
1.1764
1.1762
1.1760
1.1758
1.1756
1.1754
1.1752
-40
-15 10 35 60
TEMPERATURE (°C)
85
SPECTRAL NOISE DENSITY
1200
1000
800
600
400
200
0
0.01
0.1 1 10
FREQUENCY (kHz)
100
DIGITAL SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1000
100
10
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
SUPPLY CURRENT
vs. INPUT VOLTAGE SWEEP
8
VDD = VLOGIC = 5V, W_ AT 0dB
7 RL = 10kΩ TO VMIDBIAS
6
5
4
3
2
1
0
2.5
3.0 3.5 4.0 4.5
INPUT VOLTAGE SWEEP (VH_)
5.0
_______________________________________________________________________________________ 5
5 Page 
Stereo Volume Control
with Rotary Encoder Interface
SWITCH CONTACT
IS BOUNCING
SWITCH
CONTACT
IS STABLE
01
INPUT ACCEPTED
00
tWS
WAIT FOR FIRST
ZERO CROSSING OR
tLPW TIMEOUT, tWS
DEBOUNCE BY WAITING
FOR STABLE LOW, tLPW
SWITCH CONTACT
IS BOUNCING
READY TO ACCEPT ANOTHER
ENCODER INPUT SIGNAL
tHPW
DEBOUNCE BY WAITING
FOR STABLE HIGH, tHPW
VH
VL
(tLPW + tWS)
Figure 4b. Wiper Transition Timing Diagram—Timed Out
WIPER MOVES HERE
2dB STEPS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX5440.PDF ] | |
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