MAX5440(2006) Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Lista de partido
MAX5440 Datasheet PDF : 16 Pages
| |||
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.
Share Link: 