MAX5440 データシートの表示（PDF） - Maxim Integrated
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MAX5440 Datasheet PDF : 16 Pages
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MAX5440
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 microcontroller
(μC). Each potentiometer has 32 log-spaced tap points
with a buffered wiper output and replaces mechanical
potentiometers. An integrated bias generator 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 integrated LED drivers
indicate volume level or balance settings, depending on
the status of the mode indicator.
The MAX5440 includes debounced pushbutton inputs for
mute and mode. The mute input allows a single pushbut-
ton 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 generated by wiper transi-
tions. The MAX5440 provides a nominal temperature
coefficient of 35ppm/°C end-toend and 5ppm/°C, ratio-
metrically. The MAX5440 is available in a 24-pin SSOP
package and is specified for operation over the -40°C to
+85°C extended temperature range.
Applications
●● Stereo Volume Control
●● Desktop Speakers
●● Multimedia Docking Stations
●● Set-Top Boxes
Pin Configuration
TOP VIEW
VLOGIC 1
RENCODEB 2
RENCODEA 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
+Denotes a lead(Pb)-free/RoHS-compliant package.
Note: For leaded version, contact factory.
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
19-0542; Rev 3; 4/14
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