64-Position OTP Digital Potentiometer

Data Sheet

AD5273

Rev. J

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FEATURES

64 positions

One-time programmable (OTP)1 set-and-forget

Resistance setting—low cost alternative over EEMEM

Unlimited adjustments prior to OTP activation

1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance

Compact 8-lead SOT-23 standard package

Ultralow power: I

DD = 5 µA maximum

Fast settling time: t

S = 5 µs typical during power-up

I2C-compatible digital interface

Computer software2 replaces microcontroller in

factory programming applications

Wide temperature range: −40°C to +105°C

Low operating voltage: 2.7 V to 5.5 V

OTP validation check function

APPLICATIONS

System calibrations

Electronics level settings

Mechanical potentiometers and trimmer replacement

Transducer circuit adjustments

Programmable filters up to 6 MHz BW3

GENERAL DESCRIPTION

The AD5273 is a 64-position, one-time programmable (OTP)

digital potentiometer4 that employs fuse link technology to

achieve permanent program setting. This device performs the

same electronic adjustment function as most mechanical

trimmers and variable resistors. It allows unlimited adjustments

before permanently setting the resistance values. The AD5273 is

programmed using a 2-wire, I2C-compatible digital control.

During write mode, a fuse blow command is executed after the

final value is determined, thereby freezing the wiper position at

a given setting (analogous to placing epoxy on a mechanical

trimmer). When the permanent setting is achieved, the value

does not change, regardless of the supply variations or environ-

mental stresses under normal operating conditions. To verify

the success of permanent programming, Analog Devices, Inc.,

patterned the OTP validation such that the fuse status can be

discerned from two validation bits in the read mode.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

In addition, for applications that program the AD5273 at the

factory, Analog Devices offers device programming software2

running on Windows NT®, Windows® 2000, and Windows XP

operating systems. This software application effectively replaces

any external I2C controllers, which in turn enhances the user

system’s time-to-market.

The AD5273 is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ

resistances and in a compact 8-lead SOT-23 standard package.

It operates from −40°C to +105°C.

Along with its unique OTP feature, the AD5273 lends itself

well to general digital potentiometer applications due to its

effective resolution, array resistance options, small footprint,

and low cost.

An AD5273 evaluation kit and software are available. The kit

includes the connector and cable that can be converted for

factory programming applications.

For applications that require dynamic adjustment of resistance

settings with nonvolatile EEMEM, refer to the AD5231, AD5232,

AD5233, and AD5235 family, and the AD5251, AD5252, AD5254,

AD5258, and AD5259 family of nonvolatile memory digital

potentiometers.

1 OTP allows unlimited adjustments before permanent setting.

2 Analog Devices cannot guarantee the software to be 100% compatible to all

systems due to the wide variation in computer configurations.

3 Applies to 1 kΩ parts only.

4 The terms digital potentiometer, VR, and RDAC are used interchangeably.

GND

I2C INTERFACE

AND

CONTROL LOGIC

A

W

B

WIPER

REGISTER

FUSE

LINK

VDD

AD0

SDA

SCL

AD5273