Rainbow Electronics MAX5128 - Manual

General Description
The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer, but replaces the mechanics with a sim-
ple 2-wire digital interface. The MAX5128 performs the
same function as a discrete potentiometer or variable
resistor and features 128 taps and 22k
Ω end-to-end
resistance. The MAX5128 also features an ultra-small,
2mm x 2mm µDFN package and low 0.5µA (typ) stand-
by supply current, making this device ideal for portable
applications. The MAX5128 operates from a +2.7V to
+5.25V power supply. An integrated nonvolatile memo-
ry recalls the programmed wiper position of the digital
potentiometer. A simple 2-wire up/down interface pro-
grams the wiper position. The digital potentiometer pro-
vides a low 5ppm/°C ratiometric temperature coefficient
and is specified over the extended -40°C to +85°C tem-
perature range.
Applications
V
COM
Adjustment for LCD Panels
Backlight Adjustment
LED Bias Adjustment
Power-Supply Modules
Fiber-Module Bias Setting
Bias Setting for Radios
Portable Consumer Electronics
Features
♦ Ultra-Small, 2mm x 2mm, 8-Pin µDFN Package
♦ Power-On Recall of Wiper Position from
Nonvolatile Memory
♦ 22kΩ End-to-End Resistance
♦ 128 Tap Positions
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 1.5µA (max) Standby Supply Current
♦ +2.7V to +5.25V Single Supply Operation
♦ 80,000 Wiper Store Cycles
♦ 50-Year Wiper Data Retention
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
________________________________________________________________ Maxim Integrated Products 1
19-3929; Rev 0; 1/06
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.
Ordering Information
PART
TEMP
RANGE
PIN -
PA C K A G E TOP
MARK
PKG
CODE
M AX 5128E LA -40°C to +85°C 8 µDFN AAF L822-1
W
L
SERIAL
INTERFACE
128-POSITION
DECODER
V CC
GND
DN
UP
7-BIT NV MEMORY
POR
H
128
TAPS
7
7
MAX5128
Functional Diagram