MAX5486 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Stereo Volume Control with Pushbutton Interface

19-0672; Rev 0; 11/06
Stereo Volume Control with Pushbutton
Interface
General Description
The MAX5486 dual 40kΩ logarithmic taper volume con-
trol features a debounced pushbutton up/down interface
that controls volume and balance in audio applications.
Each potentiometer has 32 log-spaced tap points with a
buffered wiper output to replace mechanical potentiome-
ters. An integrated bias generator provides the required
((V_DD + V_SS) / 2) bias voltage, eliminating the need for
costly external op-amp circuits in unipolar audio applica-
tions. A mode-indicator LED output indicates volume or
balance control. Five integrated LED drivers indicate vol-
ume level or balance settings, depending on the status of
the mode indicator.
Use the MAX5486 digital inputs with momentary con-
tact single-pole/single-throw (SPST) pushbutton switch-
es. Each input includes internal debounced circuitry
and a pullup resistor to V_LOGIC.
The MAX5486 advances the wiper setting once per but-
ton push. Maxim’s proprietary SmartWiper™ control
eliminates the need for a microcomputer to increase the
wiper transition rate. The accelerated auto-advance
feature provides a wiper-changing rate at 4Hz for hold-
ing the control input low for more than 250ms and at
8Hz after 500ms and then at 11Hz after 1000ms (see
Table 2).
All of the MAX5486’s pushbutton inputs are debounced.
The mute input allows a single pushbutton to change
between volume control and the -90dB (typ) mute set-
ting. The mode input toggles between volume and bal-
ance control. The click-and-pop suppression feature
minimizes the audible noise generated by wiper transi-
tions. The typical total harmonic distortion plus noise
(THD+N) for the device is 0.003%. The MAX5486 pro-
vides a nominal temperature coefficient of 35ppm/°C
end-to-end and 5ppm/°C ratiometrically and a nominal
resistance of 40kΩ per potentiometer. The MAX5486 is
available in a 24-pin TSSOP package and is specified
for operation over the -40°C to +85°C extended temper-
ature range.
Applications
Home-Theater Speakers
Desktop Speakers
Portable Media Players
Docking Stations
Automotive Rear-Seat Multimedia
Features
♦ Debounced Pushbutton Interface
♦ SmartWiper Control Advances Wiper Rate
♦ Low-Power Wiper Buffers Provide 0.003% THD+N
♦ Bias Generator Eliminates External Op Amps
♦ Five-Segment LED Volume/Balance Indicator
♦ Clickless Switching
♦ Logarithmic Taper Volume Control with (31)
2dB Steps
♦ Single +2.7V to +5.5V or Dual ±2.7V Supply
Voltage Operation
♦ Power-On Reset to -12dBFS Wiper Position
♦ MUTE Function Toggles to 90dB (typ)
♦ Low 1µA Shutdown Supply Current
♦ 40kΩ End-to-End Fixed Resistance Value
♦ Small, 24-Pin TSSOP Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX5486EUG+ -40°C to +85°C 24 TSSOP
+Denotes lead-free package.
PKG
CODE
U24-1
Typical Operating Circuit
VDD
VLOGIC
1MΩ
VLOGIC
SHDN
MAX5486
(VDD + VSS) / 2
MODEIND
VPEAK
(VDD + VSS) / 2
HR
WR
RIGHT INPUT
LR
MAX9761
BIAS
LEDIND0
LEDIND1
LEDIND2
LEDIND3
LEDIND4
LL
LEFT INPUT
WL
HL
BIASCAP
VPEAK
(VDD + VSS) / 2
GND VSS MUTE UP/BALL DN/BALR MODE
SmartWiper is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.