64-Position OTP Digital Potentiometer
AD5273
FEATURES
64 Positions
FUNCTIONAL BLOCK DIAGRAM
OTP (One-Time-Programmable)1 Set-and-Forget
Resistance Setting
SCL
A
2
I C INTERFACE
SDA
AND
1 k⍀, 10 k⍀, 50 k⍀, 100 k⍀ End-to-EndTerminal Resistance
Compact Standard SOT23-8 Package
Ultralow Power: IDD = 5 A Max
CONTROL LOGIC
W
B
Fast SettlingTime: tS = 5 s Typ in Power-Up
A0
AD5273
I2C Compatible Digital Interface
Computer Software2 Replaces C in Factory Programming
Applications
WIPER
REGISTER
V
DD
WideTemperature Range: –40؇C to +105؇C
5V ProgrammingVoltage
GND
FUSE
LINK
Low OperatingVoltage, 2.7V to 5.5V
OTPValidation Check Function
APPLICATIONS
Systems Calibrations
Electronics Level Settings
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.
MechanicalTrimmers® Replacement in New Designs
Automotive Electronics Adjustments
Transducer Circuits Adjustments
Programmable Filters up to 6 MHz BW3
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.
GENERAL DESCRIPTION
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.
An AD5273 evaluation kit and software are available.The kit includes
the connector and cable that can be converted for further factory
programming applications.
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.
NOTES
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.
REV.0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed byAnalog 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 ofAnalog Devices.Trademarks and
registered trademarks are the property of their respective companies.
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© Analog Devices, Inc., 2002. All rights reserved.