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MAX5128
(Rev.:2006)

128-Tap, Nonvolatile, Linear-Taper Digital Potentiometer in 2mm x 2mm µDFN Package

Maxim Integrated 

128-Tap, Nonvolatile, Linear-Taper Digital

Potentiometer in 2mm x 2mm µDFN Package

Pin Description

PIN

NAME

FUNCTION

1

VCC

Power Supply. Bypass VCC with a 0.1µF capacitor to GND as close to the device as possible. For proper

operation, limit the supply voltage slew rate to ≥ 10µs.

2

H

High Terminal. The voltage at H can be higher than or lower than the voltage at L. Current can flow into or

out of H.

3

W

Wiper Terminal

4

L

Low Terminal. The voltage at L can be higher than or lower than the voltage at H. Current can flow into or out

of L.

5

GND Ground

6

DN Down Input

7

UP

Up Input

8

N.C. No Connection. Not internally connected.

tPWH

tPWL

UP

DN

tPWH

tPWL

tMS1

NVM WRITE

tMS1

tWP

tWS

tWH

Figure 1. Digital-Interface Timing Diagram

Detailed Description

The MAX5128 nonvolatile, single, linear-taper, digital

potentiometer performs the function of a mechanical

potentiometer or variable resistor, but replaces the

mechanics with a simple 2-wire digital interface. This

device features 128 taps and 22kΩ end-to-end resis-

tance with a 5ppm/°C ratiometric temperature coeffi-

cient. The MAX5128 operates from a +2.7V to +5.25V

power supply and consumes only 0.5µA (typ) of stand-

by supply current. The MAX5128 includes an integrat-

ed nonvolatile memory that recalls the stored wiper

position of the digital potentiometer. A simple 2-wire

up/down interface programs the wiper positions.

Analog Circuitry

The MAX5128 consists of a resistor array with 127

resistive elements; 128 tap points along the resistor

string between H and L are accessible to the wiper, W.

Select the wiper tap point by programming the poten-

tiometer through the 2-wire (UP, DN) interface.

The MAX5128 features power-on reset circuitry that

loads the wiper position from the nonvolatile memory at

power-up.

The nonvolatile memory is programmed to midscale at

the factory.

8 _______________________________________________________________________________________

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