Rainbow Electronics MAX5457 - Manual

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 50k
Ω 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 10k
Ω 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
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
MAX5456/MAX5457
Stereo Audio Taper Potentiometers
with Pushbutton Interface
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3490; Rev 1; 12/05
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.
Typical Application Circuits and Selector Guide appear at
end of data sheet.
PART TEMP RANGE
PIN-
PACKAGE PKG
CODE
MAX5456EEE -40 o C to +85 o C 16 QSOP E16-1
MAX5456ETE* -40 o C to +85 o C 16 TQFN T1644-4
MAX5457EEE -40 o C to +85 o C 16 QSOP E16-1
MAX5457ETE* -40 o C to +85 o C 16 TQFN T1644-4
SPI is a trademark of Motorola, Inc.
SmartWiper is a trademark of Maxim Integrated Products, Inc.
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
DN/BAL0 V DD
V LOGIC
GND
V SS
H1
L1
W1
MUTE
MAX5457
QSOP
UP/BAL1
MODE
L0
MODE_IND
H0
W0
SHDN
Pin Configurations
Pin Configurations are continued at end of data sheet.
*Future product—contact factory for availability.