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AD5171 Datasheet PDF Download - Analog Devices

Номер произв AD5171
Описание 64-Position OTP Digital Potentiometer
Производители Analog Devices
логотип Analog Devices логотип 
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AD5171 Даташит, Описание, Даташиты
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.
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AD5171 Даташит, Описание, Даташиты
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
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AD5171 Даташит, Описание, Даташиты
AD5171
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS: 5 kΩ, 10 kΩ, 50 kΩ, AND 100 kΩ
VDD = 3 V to 5 V ± 10%, VA = VDD, VB = 0 V, −40°C < TA < +125°C, unless otherwise noted.
Table 1.
Parameter
DC CHARACTERISTICS RHEOSTAT MODE
Resistor Differential Nonlinearity2
Resistor Integral Nonlinearity2
Nominal Resistor Tolerance3
Resistance Temperature Coefficient
Wiper Resistance
DC CHARACTERISTICS POTENTIOMETER DIVIDER
MODE (SPECIFICATIONS APPLY TO ALL RDACs)
Resolution
Differential Nonlinearity4
Integral Nonlinearity4
Voltage Divider Temperature Coefficient
Full-Scale Error
Full-Scale Error
Zero-Scale Error
RESISTOR TERMINALS
Voltage Range5
Capacitance A, B6
Capacitance W6
Common-Mode Leakage
DIGITAL INPUTS
Input Logic High (SDA and SCL)7
Input Logic Low (SDA and SCL)7
Input Logic High (AD0)
Input Logic Low (AD0)
Input Current
Input Capacitance8
DIGITAL OUTPUTS
Output Logic Low (SDA)
Three-State Leakage Current (SDA)
Output Capacitance8
POWER SUPPLIES
Power Supply Range
OTP Power Supply7, 9
Supply Current
OTP Supply Current7, 10, 11
Power Dissipation12
Power Supply Sensitivity
Symbol
R-DNL
R-INL
∆RAB/RAB
(∆RAB/RAB)/∆T
RW
N
DNL
INL
(∆VW/VW)/∆T
VWFSE
VWFSE
VWZSE
VA, VB, VW
CA, CB
CW
ICM
VIH
VIL
VIH
VIL
IIL
CIL
VOL
IOZ
COZ
VDD
VDD_OTP
IDD
IDD_OTP
PDISS
PSSR
Conditions
RWB, VA = no connect,
RAB = 10 kΩ, 50 kΩ, and 100 kΩ
RWB, VA = no connect, RAB = 5 kΩ
RWB, VA = no connect,
RAB = 10 kΩ, 50 kΩ, and 100 kΩ
RWB, VA = no connect, RAB = 5 kΩ
VDD = 5 V
Code = 0x20
Code = 0x3F, RAB = 10 kΩ,
50 kΩ, and 100 kΩ
Code = 0x3F, RAB = 5 kΩ
Code = 0x00, RAB =10 kΩ,
50 kΩ, and 100 kΩ
Code = 0x00, RAB = 5 kΩ
With respect to GND
f = 1 MHz, measured to GND,
code = 0x20
f = 1 MHz, measured to GND,
code = 0x20
VA = VB = VDD/2
VDD = 3 V
VDD = 3 V
VIN = 0 V or 5 V
IOL = 6 mA
VIN = 0 V or 5 V
TA = 25°C
VIH = 5 V or VIL = 0 V
VDD_OTP = 5 V, TA = 25°C
VIH = 5 V or VIL = 0 V, VDD = 5 V
Min
−0.5
−1
−1.5
−1.5
−30
−0.5
−1
−1
−1.5
0
0
0.7 VDD
−0.5
3.0
0
2.7
4.75
−0.025
Typ 1
±0.1
±0.25
±0.35
±0.5
35
60
±0.1
±0.2
5
−0.5
0.5
25
55
1
3
3
5
4
100
0.02
+0.001
Max
+0.5
+1
+1.5
+1.5
+30
115
6
+0.5
+1
0
0
1
2
VDD
VDD + 0.5
+0.3 VDD
VDD
1.0
±1
0.4
±1
5.5
5.25
10
0.055
+0.025
Unit
LSB
LSB
LSB
LSB
%
ppm/°C
Ω
Bits
LSB
LSB
ppm/°C
LSB
LSB
LSB
LSB
V
pF
pF
nA
V
V
V
V
μA
pF
V
μA
pF
V
V
μA
mA
mW
%/%
Rev. D | Page 3 of 24
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