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Analog Devices Semiconductor Electronic Components Datasheet

AD5171 Datasheet

64-Position OTP Digital Potentiometer

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AD5171 pdf
64-Position OTP Digital Potentiometer
AD5171
FEATURES
64 position
One-time programmable (OTP) set-and-forget resistance
setting—low cost alternative over EEMEM
Unlimited adjustments prior to OTP activation
5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end resistance
Low temperature coefficient: 5 ppm/°C in potentiometer mode
Low temperature coefficient: 35 ppm/°C in rheostat mode
Compact standard 8-lead SOT-23 package
Low power: IDD = 10 μA maximum
Fast settling time: tS = 5 μs typical in power-up
I2C-compatible digital interface
Computer software replaces microcontroller in factory
programming applications
Full read/write of wiper register
Extra I2C device address pin
Low operating voltage: 2.7 V to 5.5 V
OTP validation check function
Automotive temperature range: −40°C to +125°C
APPLICATIONS
System calibrations
Electronics level settings
Mechanical trimmers and potentiometer replacements
Automotive electronics adjustments
Gain control and offset adjustments
Transducer circuit adjustments
Programmable filters up to 1.5 MHz BW1
GENERAL DESCRIPTION
The AD5171 is a 64-position, one-time programmable (OTP)
digital potentiometer2 that uses fuse link technology to achieve
the memory retention of the resistance setting function. OTP is
a cost-effective alternative over the EEMEM approach for users
who do not need to reprogram new memory settings in the
digital potentiometer. This device performs the same electronic
adjustment function as most mechanical trimmers and variable
resistors. The AD5171 is programmed using a 2-wire, I2C®-
compatible digital control. It allows unlimited adjustments
before permanently setting the resistance value. During the
OTP activation, a permanent fuse blown command is sent after the
final value is determined, freezing the wiper position at a given
setting (analogous to placing epoxy on a mechanical trimmer).
FUNCTIONAL BLOCK DIAGRAM
SCL
SDA
I2C INTERFACE
AND
CONTROL LOGIC
A
W
AD0 B
VDD
GND
FUSE
LINK
WIPER
REGISTER
AD5171
Figure 1.
W1
8A
VDD 2 AD5171 7 B
GND
3
TOP VIEW
(Not to Scale)
6
AD0
SCL 4
5 SDA
Figure 2. Pin Configuration
When this permanent setting is achieved, the value does not
change regardless of supply variations or environmental 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 read mode.
For applications that program the AD5171 in factories, Analog
Devices offers device programming software that operates
across Windows® 95 to XP platforms, including Windows NT.
This software application effectively replaces the need for external
I2C controllers or host processors and, therefore, significantly
reduces the development time of the users.
An AD5171 evaluation kit includes the software, connector, and
cable that can be converted for factory programming applications.
The AD5171 is available in a compact 8-lead SOT-23 package.
All parts are guaranteed to operate over the automotive temper-
ature range of −40°C to +125°C. Besides its unique OTP feature,
the AD5171 lends itself well to other general-purpose digital
potentiometer applications due to its temperature performance,
small form factor, and low cost.
1 Applies to 5 kΩ parts only.
2 The terms digital potentiometer and RDAC are used interchangeably.
Rev. D
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2008 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5171 Datasheet

64-Position OTP Digital Potentiometer

No Preview Available !

AD5171 pdf
AD5171
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Electrical Characteristics: 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ .. 3 
Timing Characteristics: 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ...... 5 
Absolute Maximum Ratings............................................................ 6 
ESD Caution.................................................................................. 6 
Pin Configuration and Function Descriptions............................. 7 
Typical Performance Characteristics ............................................. 8 
Theory of Operation ...................................................................... 12 
One-Time Programming (OTP) .............................................. 12 
Variable Resistance and Voltage for Rheostat Mode ............. 13 
Variable Resistance and Voltage for Potentiometer Mode.... 13 
Power Supply Considerations ................................................... 14 
ESD Protection ........................................................................... 14 
Terminal Voltage Operating Range.......................................... 15 
REVISION HISTORY
7/08—Rev. C to Rev. D
Changes to Power Supplies Parameter in Table 1.........................3
Updated Fuse Blow Condition to 400 ms Throughout ...............5
1/08—Rev. B to Rev. C
Updated Format..................................................................Universal
Deleted Note 1; Renumbered Sequentially ................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 5
Changes to Table 3............................................................................ 6
Changes to Table 4............................................................................ 7
Changes to Figure 13 to Figure 16.................................................. 9
Changes to Figure 17 and Figure 18............................................. 10
Inserted Figure 24........................................................................... 11
Changes to One-Time Programming (OTP) Section and Power
Supply Considerations Section ..................................................... 12
Deleted Figure 25 and Figure 26................................................... 13
Updated Outline Dimensions ....................................................... 22
Changes to Ordering Guide .......................................................... 22
Power-Up/Power-Down Sequences......................................... 15 
Controlling the AD5171................................................................ 16 
Software Programming ............................................................. 16 
Device Programming................................................................. 16 
I2C Controller Programming.................................................... 17 
I2C-Compatible 2-Wire Serial Bus........................................... 17 
Controlling Two Devices on One Bus ..................................... 18 
Applications Information .............................................................. 19 
DAC.............................................................................................. 19 
Gain Control Compensation .................................................... 19 
Programmable Voltage Source with Boosted Output ........... 19 
Level Shifting for Different Voltage Operation ...................... 19 
Resistance Scaling ...................................................................... 19 
Resolution Enhancement .......................................................... 20 
RDAC Circuit Simulation Model............................................. 20 
Evaluation Board ............................................................................ 21 
Outline Dimensions ....................................................................... 22 
Ordering Guide .......................................................................... 22 
1/05—Rev. A to Rev. B
Change to Features ............................................................................1
Changes to Electrical Characteristics .............................................3
Change to Table 3 ..............................................................................6
Changes to Power Supply Considerations Section .................... 13
Changes to Level Shifting for Different Voltage Operation
Section.............................................................................................. 19
Added Note to Ordering Guide.................................................... 22
11/04—Rev. 0 to Rev. A
Changes to Specifications.................................................................3
Changes to Table 3.............................................................................7
Changes to One-Time Programming Section ............................ 11
Changes to Power Supply Consideration Section ...................... 11
Changes to Figure 26 and Figure 27............................................. 12
1/04—Revision 0: Initial Version
Rev. D | Page 2 of 24


Part Number AD5171
Description 64-Position OTP Digital Potentiometer
Maker Analog Devices
Total Page 24 Pages
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