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PDF MAX5486 Data sheet ( Hoja de datos )
| Número de pieza | MAX5486 | |
| Descripción | Stereo Volume Control | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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
((VDD + VSS) / 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 VLOGIC.
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.
1 page  
www.DataSheet4U.com
Stereo Volume Control with Pushbutton
Interface
Typical Operating Characteristics
(VDD = +5.0V, VSS = GND = 0, VLOGIC = +5.0, VH_ = VDD - 0.15V, VL_ = VDD / 2, CBIASCAP = 1µF)
ATTENUATION vs. TAP POSITION
0
-10
-20
-30
-40
-50
-60
-70
0 4 8 12 16 20 24 28 32
TAP POSITION
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
0.15
VDD = VLOGIC = 5V
0.10 VSS = GND = 0
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
-40
-15 10 35 60
TEMPERATURE (°C)
85
WIPER SWITCHING TRANSIENT
MAX5486 toc03
5V/div
DN
200mV/div
40ms/div
WIPER TRANSITION
FROM -2dB TO -4dB
WIPER-TO-END TERMINAL VOLTAGE
vs. TAP POSITION
100
90 VHW
80
70
60
50
40
30
20
10 VWL
0
0 4 8 12 16 20 24 28 32
TAP POSITION
FREQUENCY RESPONSE
5
VH1 = 2.5V ±1VRMS, VL1 = 2.5V
0
W_ SET TO 0dB
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
100
VDD = 5V
VSS = GND
10 VL_ = 2.5V
W_ SET TO 0dB
-5
W_ SET TO -6dB
1
0.1 10kΩ OR NO LOAD
-10
W_ SET TO -12dB
-15
W_ SET TO -18dB
0.01
0.001
VH_ = 2.5V ±1.5VRMS
VH_ = 2.5V ±1VRMS
-20
0.01
0.1
1
0.0001
10 100 1000
0.01
FREQUENCY (kHz)
10kΩ OR NO LOAD
0.1 1 10
FREQUENCY (kHz)
100
POWER-SUPPLY REJECTION RATIO
-30
-35 VDD = 5V ±100mVP-P, VSS = GND
-40 VH_ = 5V, VL_ = 2.5V
-45 W_ SET TO -6dB
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
0.01 0.1 1 10 100
FREQUENCY (kHz)
_______________________________________________________________________________________ 5
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Stereo Volume Control with Pushbutton
Interface
Table 3. LED Settings in Volume Mode
VOLUME POSITION
0dB to -8dB
-10dB to -18dB
-20dB to -28dB
-30dB to -38dB
-40dB to -52dB
-54dB to mute (-90dB)
LED0
1
1
1
1
1
0
VOLUME LED OUTPUTS ( 1 = LED IS ON)
LED1
LED2
LED3
111
111
110
100
000
000
LED4
1
0
0
0
0
0
Table 3 shows the LED display as the wipers transition
through various attenuation levels.
A PWM circuit interpolates the high-resolution 32 steps
between the five LEDs over the volume range from 0dB
to -54dB. This feature provides visible indication for the
attenuation levels from 0dB to -54dB. For example,
LED4 brightness level decreases progressively with
each -2dB step from 0dB to -8dB. PWM is disabled in
the range -56dB to mute.
In balance-control mode, only one LED is on at a time
to indicate the current balance setting. Figure 5 shows
the LEDs display for the current balance setting. When
LED2 is on, the display indicates that the channels are
centered or balanced at a set volume level. When LED4
turns on, the balance shifts completely toward the right
channel and the left channel becomes fully attenuated.
Multiple Button Pushes
The MAX5486 does not respond to simultaneous button
pushes. Additionally, a 16ms blocking period affects all
other inputs when releasing any input that was forced low.
The MAX5486 does not respond to any logic input until
the blocking period ends. If multiple-control buttons are
pressed, all wiper-control connections must be released
before the device responds to further commands.
Applications Information
The Typical Operating Circuit shows a typical volume/
balance application circuit using the MAX5486 in a sin-
gle-supply configuration. The internally generated BIAS
voltage eliminates the need for external op amps, and
the wipers have internal low-power buffers for low dis-
tortion. Connect the W_ outputs of the MAX5486 to the
left and right inputs of a stereo audio amplifier, such as
the MAX9761. The pushbutton potentiometers attenu-
ate the input signals. Use the MODE input to switch
between volume-control and balance-control modes.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX5486.PDF ] | |
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