64-Position OTP Digital Potentiometer
OTP (One-Time-Programmable)1 Set-and-Forget
1 k⍀, 10 k⍀, 50 k⍀, 100 k⍀ End-to-End Terminal Resistance
Compact Standard SOT23-8 Package
Ultralow Power: IDD = 5 A Max
Fast Settling Time: tS = 5 s Typ in Power-Up
www.DataSheet4UI.2cComCompatible Digital Interface
Computer Software2 Replaces C in Factory Programming
Wide Temperature Range: –40؇C to +105؇C
5 V Programming Voltage
Low Operating Voltage, 2.7 V to 5.5 V
OTP Validation Check Function
Electronics Level Settings
Mechanical Trimmers® Replacement in New Designs
Automotive Electronics Adjustments
Transducer Circuits Adjustments
Programmable Filters up to 6 MHz BW3
The AD5273 is a 64-position, One-Time-Programmable (OTP)
digital potentiometer4 that employs fuse link technology to achieve
the permanent program setting. This device performs the same
electronic adjustment function as most mechanical trimmers and
variable resistors. It allows unlimited adjustments before perma-
nently setting the resistance values. The AD5273 is programmed
using a 2-wire, I2C compatible digital control. During the write
mode, a fuse blow command is executed after the ﬁnal value
is determined, therefore freezing the wiper position at a given
setting (analogous to placing epoxy on a mechanical trimmer).
When this permanent setting is achieved, the value will not change
regardless of the supply variations or environmental stresses under
normal operating conditions. To verify the success of permanent
programming, Analog Devices patterned the OTP validation such
that the fuse status can be discerned from two validation bits in
the read mode.
FUNCTIONAL BLOCK DIAGRAM
In addition, for applications that program AD5273 at the factory,
Analog Devices offers device programming software2 running in
Windows® NT, 2000, and XP operating systems. This software
application effectively replaces any external I2C controllers, which
in turn enhances users’ systems time-to-market.
AD5273 is available in 1 k⍀, 10 k⍀, 50 k⍀, and 100 k⍀ in
compact SOT23 8-lead standard package and operates from
–40°C to +105°C.
Besides 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 further factory
For applications that require dynamic adjustment of resistance
settings with nonvolatile EEMEM, users should refer to AD523x
and AD525x families of nonvolatile memory digital potentiometers.
1 One-Time-Programmable—Unlimited adjustments before permanent setting.
2 ADI cannot guarantee the software to be 100% compatible in all systems due to
the wide variations in computer conﬁgurations.
3 Applies to 1 k⍀ parts only.
4The terms digital potentiometer, VR, and RDAC are used interchangeably.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or other-
wise under any patent or patent rights of Analog Devices.Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Fax: 781/326-8703 © Analog Devices, Inc., 2002. All rights reserved.