19-0542; Rev 1; 5/06
Stereo Volume Control
with Rotary Encoder Interface
General Description
The MAX5440 dual, 40k鈩?logarithmic taper volume con-
trol features a debounced up/down interface for use
with a simple rotary encoder without using a microcon-
troller (碌C). 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
DD
+ V
SS
) / 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/擄C end-to-
end and 5ppm/擄C, ratiometrically. The MAX5440 is
available in a 24-pin SSOP package and is specified for
operation over the -40擄C to +85擄C extended tempera-
ture range.
Features
鈾?/div>
Logarithmic Taper Volume Control with (31) 2dB
Steps
鈾?/div>
Low-Power Wiper Buffers Provide 0.003% THD
鈾?/div>
Single +2.7V to +5.5V or Dual 鹵2.7V Supply
Voltage Operation
鈾?/div>
Low 0.5碌A(chǔ) Shutdown Supply Current
鈾?/div>
Integrated Bias Voltage Generator
鈾?/div>
Five-Segment LED Volume/Balance Indicator
鈾?/div>
Clickless Switching
鈾?/div>
40k鈩?End-to-End Fixed Resistance Value
鈾?/div>
Mute Function Toggles to -90dB (typ)
鈾?/div>
Power-On Reset to -12dBFS Wiper Position
MAX5440
Ordering Information
PART
MAX5440EAG
TEMP RANGE
-40擄C to +85擄C
PIN-PACKAGE
24 SSOP
PKG
CODE
A24-1
Applications
Stereo Volume Control
Desktop Speakers
Multimedia Docking Stations
Set-Top Boxes
Automotive Back-Seat Multimedia
Typical Operating Circuit
V
DD
V
LOGIC
V
LOGIC
Pin Configuration
TOP VIEW
V
LOGIC
RENCODEA
RENCODEB
MUTE
MODE
SHDN
GND
H0
L0
1
2
3
4
5
6
7
8
9
24 GND
23 MODEIND
22 LEDIND4
SHDN
MODEIND
V
PEAK
(V
DD +
V
SS
) / 2
MAX5440
H1
W1
RIGHT INPUT
L1
MIDBIAS
HEADPHONE
DRIVER
MAX5440
21 LEDIND3
20 LEDIND2
19 LEDIND1
18 LEDIND0
17 H1
V
SS
LEDIND0
LEDIND1
LEDIND2
LEDIND3
(V
DD +
V
SS
) / 2
L0
W0
LEFT INPUT
H0
LEDIND4
BIAS
16 L1
GND
MUTE
MODE
RENCODEA
RENCODEA
W0 10
MIDBIAS 11
BIAS 12
15 W1
14 V
SS
13 V
DD
ROTARY
ENCODER
SSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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