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PDF MAX5456 Data sheet ( Hoja de datos )
| Número de pieza | MAX5456 | |
| Descripción | Stereo Audio Taper Potentiometers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3490; Rev 0; 11/04
www.DataSheet4U.com
Stereo Audio Taper Potentiometers
with Pushbutton Interface
General Description
The MAX5456/MAX5457 dual, logarithmic taper digital
potentiometers feature a simple pushbutton interface
that controls volume and balance in audio applications.
Each potentiometer has 32 tap points and replaces
mechanical potentiometers. Refer to the MAX5408–
MAX5411 data sheet for SPI™ versions of the MAX5456/
MAX5457.
Use the MAX5456/MAX5457 digital inputs with momen-
tary contact single-pole/single-throw (SPST) pushbutton
switches. Each input includes internal debounce cir-
cuitry and a 50kΩ pullup resistor.
The MAX5456/MAX5457 advance the wiper setting once
per button push. Maxim’s proprietary SmartWiper™ con-
trol eliminates the need for a microcomputer to increase
the wiper transition rate. Holding the control input low for
more than 1s advances the wiper at a rate of 4Hz for 4s
and 16Hz per second thereafter.
The MAX5456/MAX5457 provide temperature coeffi-
cients of 50ppm/°C end-to-end and 5ppm/°C ratiomet-
ric and a nominal resistance of 10kΩ per potentiometer.
An integrated click/pop suppression feature minimizes
the audible noise generated by wiper transitions. The
typical total harmonic distortion plus noise (THD+N) for
these devices is 0.01%.
The MAX5457 features a 3-button interface with a
MODE input that toggles between volume- and balance-
control modes. An LED output indicates volume or bal-
ance mode. The MAX5456 features a 4-button interface
with separate inputs for up and down volume controls
and left and right balance controls.
The MAX5456/MAX5457 are available in 16-pin QSOP
and 16-pin TQFN packages and are specified over the
extended (-40°C to +85°C) temperature range.
Applications
Stereo Volume Control
Fading and Balancing Stereo Signals
Stereo Blending and Mixing
Typical Application Circuits and Selector Guide appear at
end of data sheet.
SPI is a trademark of Motorola, Inc.
SmartWiper is a trademark of Maxim Integrated Products, Inc.
Features
♦ SmartWiper Control Provides Accelerated Wiper
Motion
♦ Debounced Pushbutton Interface with Internal
Pullup Resistors
♦ Logarithmic Taper with 2dB Steps Between Taps
♦ Single +2.7V to +5.5V or Dual ±2.7V Supply
Operation
♦ Low 0.5µA Standby Supply Current
♦ Clickless Switching
♦ 10kΩ End-to-End Fixed Resistance Value
♦ Mute Function to -90dB (typ)
♦ Power-On Reset to -12dB Wiper Position
♦ 32 Tap Positions for Each Wiper
♦ Small 16-Pin QSOP/TQFN Packages
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5456EEE
-40oC to +85oC
16 QSOP
MAX5456ETE*
-40oC to +85oC
16 TQFN
MAX5457EEE*
-40oC to +85oC
16 QSOP
MAX5457ETE*
-40oC to +85oC
16 TQFN
*Future product—contact factory for availability.
Pin Configurations
TOP VIEW
DN/BAL0 1
UP/BAL1 2
MODE 3
MODE_IND 4
H0 5
L0 6
W0 7
SHDN 8
MAX5457
QSOP
16 VDD
15 VLOGIC
14 GND
13 VSS
12 H1
11 L1
10 W1
9 MUTE
Pin Configurations are continued at end of data sheet.
________________________________________________________________ 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 Audio Taper Potentiometers
with Pushbutton Interface
Typical Operating Characteristics (continued)
(VDD = VLOGIC = +2.7V to +5.5V, VSS = 0V, GND = 0V, VH_ = VDD, VL_ = VSS, TA = TMIN to TMAX. Typical values are at TA = +25°C,
unless otherwise specified.)
LOGIC SUPPLY CURRENT
vs. LOGIC SUPPLY VOLTAGE
0.30
0.25
0.20
STANDBY LOGIC SUPPLY
CURRENT
0.15
0.10
0.05
WIPER-TO-END TERMINAL RESISTANCE
vs. TAP POSITION
100
RWH
75
50
25
RWL
FREQUENCY RESPONSE
2
VH_ = 2.5V ±1VP-P, VL_ = 2.5V,
CL_ = 10pF
0
W_ SET TO 0dB
-2
-4
W_ SET TO -6dB
-6
0
2.7
3.2 3.7 4.2 4.7 5.2 5.5
LOGIC SUPPLY VOLTAGE (V)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
100
VH_ = 2.5V ±1VP-P, VL_ = 2.5V,
W_ SET TO -6dB,
10 20Hz TO 20kHz BANDPASS
1
0.1 LOAD = 10kΩ
0.01
0.001
NO LOAD
0.0001
10
100 1000 10,000 100,000
FREQUENCY (Hz)
0
0
1000
900
800
700
600
500
400
300
200
100
0
0
8 16 24
TAP POSITION
DIGITAL SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1234
DIGITAL INPUT VOLTAGE (V)
32
5
-8
0.01
0.1 1 10 100
FREQUENCY (kHz)
1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
-10
VDD = 5V ±1VP-P, VH_ = 5V,
VL_ = 2.5V, W_ SET TO -6dB
-20
-30
-40
-50
-60
-70
-80
-90
1
10 100
FREQUENCY (kHz)
1000
LOGIC SUPPLY CURRENT
vs. TEMPERATURE
150
149 VLOGIC = 5.5V
148
147
146 ACTIVE LOGIC SUPPLY
CURRENT
145
144
143
142
141
140
-40
-15 10 35 60
TEMPERATURE (°C)
85
10
9
8
7
6
5
4
3
2
1
0
0.01
SPECTRAL NOISE DENSITY
0.1 1 10
FREQUENCY (kHz)
100
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Stereo Audio Taper Potentiometers
with Pushbutton Interface
Shutdown, SHDN
Upon entering shutdown mode, the MAX5456/MAX5457
store the last wiper settings. The wipers move to the L_
end of the resistor string, and the H_ end of the resistor
string disconnects from the signal input. Terminating
shutdown mode restores the wipers to their previous
settings (see Figure 2). Shutdown does not affect the
state of MODE_IND.
Mute Function, MUTE
The MAX5456/MAX5457 feature a mute function. Success-
ive pulses on MUTE toggle its setting. Activating the mute
function forces both wipers to maximum attenuation (-
90dB typ). Deactivating the mute function returns the
wipers to their previous settings. Pressing VOLUP also
deactivates mute, setting the wipers to their previous
positions. MUTE is internally pulled high with a 50kΩ
resistor to VLOGIC. When both wipers are in the 31st
tap position (-62dB attenuation), further commands to
VOLDN place the wipers in the mute position (see
Table 1). VOLUP or MUTE pulses return the wipers to
position 31.
SWITCH SWITCH
CONTACT CONTACT
IS BOUNCING IS STABLE
1
SWITCH
CONTACT
IS BOUNCING
READY TO ACCEPT
ANOTHER KEYPRESS
0
VH
VL
INPUT ACCEPTED
tIPW tWS
WAIT FOR
DEBOUNCE BY FIRST ZERO
WAITING FOR CROSSING OR
STABLE LOW, TIMEOUT, tWS
tIPW
tHPW
DEBOUNCE BY
WAITING FOR
STABLE HIGH, tHPW
(tIPW + tWS)
WIPER MOVES HERE
2dB
STEPS
Figure 5b. Wiper Transition Timing Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX5456.PDF ] | |
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