AD5172 Datasheet PDF - Analog Devices

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AD5172
Analog Devices

Part Number AD5172
Description Dual-Channel I2C Digital Potentiometers
Page 28 Pages


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Data Sheet
256-Position, One-Time Programmable,
Dual-Channel, I2C Digital Potentiometers
AD5172/AD5173
FEATURES
2-channel, 256-position potentiometers
One-time programmable (OTP) set-and-forget resistance
setting provides a low cost alternative to EEMEM
Unlimited adjustments prior to OTP activation
OTP overwrite allows dynamic adjustments with user-
defined preset
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ
Compact 10-lead MSOP: 3 mm × 4.9 mm
Fast settling time: tS = 5 μs typical on power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins: AD0 and AD1 (AD5173 )
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: IDD = 6 μA maximum
Wide operating temperature: −40°C to +125°C
FUNCTIONAL BLOCK DIAGRAMS
A1 W1 B1
A2 W2 B2
VDD
GND
FUSE
LINKS
12
RDAC
REGISTER 1
RDAC
REGISTER 2
SDA
SCL
/8
SERIAL INPUT
REGISTER
Figure 1. AD5172 Functional Block Diagram
W1 B1
W2 B2
APPLICATIONS
Systems calibration
Electronics level setting
Mechanical trimmers replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL DESCRIPTION
The AD5172/AD5173 are dual-channel, 256-position, one-time
programmable (OTP) digital potentiometers1 that employ fuse
link technology to achieve memory retention of resistance
settings. OTP is a cost-effective alternative to EEMEM for users
who do not need to program the digital potentiometer setting
in memory more than once. These devices perform the same
electronic adjustment function as mechanical potentiometers or
variable resistors but with enhanced resolution, solid-state reliabil-
ity, and superior low temperature coefficient performance.
The AD5172/AD5173 are programmed using a 2-wire, I2C®-
compatible digital interface. Unlimited adjustments are allowed
VDD
GND
FUSE
LINKS
12
RDAC
REGISTER 1
RDAC
REGISTER 2
AD0 ADDRESS
/AD1
DECODE
8
SDA
SCL
SERIAL INPUT
REGISTER
Figure 2. AD5173 Functional Block Diagram
before permanently setting the resistance value. During OTP
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
Unlike traditional OTP digital potentiometers, the AD5172/
AD5173 have a unique temporary OTP overwrite feature that
allows for new adjustments even after a fuse is blown. However,
the OTP setting is restored during subsequent power-up condi-
tions. This allows users to treat these digital potentiometers as
volatile potentiometers with a programmable preset.
1 The terms digital potentiometer, VR, and RDAC are used interchangeably.
Rev. I
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 ©2003–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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AD5172/AD5173
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagrams............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Electrical Characteristics: 2.5 kΩ ............................................... 4
Electrical Characteristics: 10 kΩ, 50 kΩ, and 100 kΩ ............. 5
Timing Characteristics ................................................................ 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configurations and Function Descriptions ........................... 9
Typical Performance Characteristics ........................................... 10
Test Circuits..................................................................................... 15
Theory of Operation ...................................................................... 16
One-Time Programming (OTP) .............................................. 16
Data Sheet
Programming the Variable Resistor and Voltage ................... 16
Programming the Potentiometer Divider............................... 17
ESD Protection ........................................................................... 18
Terminal Voltage Operating Range ......................................... 18
Power-Up Sequence ................................................................... 18
Power Supply Considerations ................................................... 18
Layout Considerations............................................................... 19
I2C Interface .................................................................................... 20
Write Mode ................................................................................. 20
Read Mode .................................................................................. 20
I2C Controller Programming.................................................... 21
I2C-Compatible, 2-Wire Serial Bus.......................................... 22
Level Shifting for Different Voltage Operation ...................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 25
Rev. I | Page 2 of 28



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Data Sheet
REVISION HISTORY
8/13—Rev. H to Rev. I
Changed VA, VB, VW to GND and Digital Inputs and Output
Voltage to GND Rating to −0.3 V to +7 V or VDD + 0.3 V
(whichever is less); Table 4...............................................................7
Changes to Ordering Guide...........................................................25
4/09—Rev. G to Rev. H
Changes to DC Characteristics—Rheostat Mode Parameter and
to DC Characteristics—Potentiometer Divider Mode Parameter,
Table 1 .................................................................................................3
12/08—Rev. F to Rev. G
Changes to OTP Supply Voltage Parameter, Table 1 ....................3
Changes to OTP Supply Voltage Parameter, Table 2 ....................5
Changes to Table 5 and Table 6 .......................................................8
Changes to One-Time Programming (OTP) Section ................15
Changes to Power Supply Considerations Section, Figure 46,
and Figure 46 Caption ....................................................................17
Changes to Ordering Guide...........................................................23
7/08—Rev. E to Rev. F
Changes to Power Supplies Parameter in Table 1 and Table 2 ....3
Updated Fuse Blow Condition to 400 ms Throughout................5
1/08—Rev. D to Rev. E
Changes to Features ..........................................................................1
Changes to General Description .....................................................1
Changes to OTP Supply Voltage and OTP Supply Current in
Table 1 .................................................................................................3
Changes to OTP Supply Voltage and OTP Supply Current in
Table 2 .................................................................................................5
Added OTP Program Time in Table 3............................................6
Changes to Table 4 ............................................................................7
Changes to Table 5 and Table 6 .......................................................8
Inserted Figure 30............................................................................13
Replaced One-Time Programming (OTP) Section....................15
Replaced Power Supply Considerations Section.........................17
Deleted Device Programming Software Section.........................20
Replaced I2C-Compatible, 2-Wire Serial Bus Section................21
Changes to Ordering Guide...........................................................23
AD5172/AD5173
6/06—Rev. C to Rev. D
Changes to Features ..........................................................................1
Changes to One-Time Programming (OTP) Section ................15
Changes to Figure 44 and Figure 45 .............................................17
Changes to Power Supply Considerations Section .....................18
Changes to Figure 46 and Figure 47 .............................................18
Changes to Device Programming Software Section...................19
Updated Outline Dimensions........................................................24
6/05—Rev. B to Rev. C
Added Footnote 8, Footnote 9, and Footnote 10 to Table 1........3
Added Footnote 8 to Table 2............................................................5
Changes to Table 5 and Table 6 .......................................................9
Changes to Power Supply Considerations Section .....................17
Changes to I2C-Compatible 2-Wire Serial Bus Section .............23
Added Level Shifting for Different Voltage Operation Section.......24
Updated Outline Dimensions........................................................25
Changes to Ordering Guide...........................................................25
10/04—Rev. A to Rev. B
Updated Format ................................................................ Universal
Changes to Specifications.................................................................3
Changes to One-Time Programming (OTP) Section ................13
Changes to Power Supply Considerations Section .....................15
Changes to Figure 44 and Figure 45 .............................................15
Changes to Figure 46 and Figure 47 .............................................16
11/03—Rev. 0 to Rev. A
Changes to Electrical Characteristics—2.5 kΩ .............................3
11/03—Revision 0: Initial Version
Rev. I | Page 3 of 28



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AD5172/AD5173
Data Sheet
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS: 2.5 kΩ
VDD = 5 V ± 10%, or 3 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
MODE4
Differential Nonlinearity5
Integral Nonlinearity5
Voltage Divider Temperature Coefficient
Full-Scale Error
Zero-Scale Error
RESISTOR TERMINALS
Voltage Range6
Capacitance A, B7
Capacitance W7
Shutdown Supply Current8
Common-Mode Leakage
DIGITAL INPUTS AND OUTPUTS
SDA and SCL
Input Logic High9
Input Logic Low9
AD0 and AD1
Input Logic High
Input Logic Low
Input Current
Input Capacitance7
POWER SUPPLIES
Power Supply Range
OTP Supply Voltage9, 10
Supply Current
OTP Supply Current9, 11, 12
Power Dissipation13
Power Supply Sensitivity
DYNAMIC CHARACTERISTICS14
Bandwidth, −3 dB
Total Harmonic Distortion
Symbol
R-DNL
R-INL
∆RAB
(∆RAB/RAB)/∆T
RWB
DNL
INL
(ΔVW/VW)/ΔT
VWFSE
VWZSE
VA, VB, VW
CA, CB
CW
IA_SD
ICM
VIH
VIL
VIH
VIL
IIL
CIL
VDD_RANGE
VDD_OTP
IDD
IDD_OTP
PDISS
PSS
BW
THDW
Conditions
RWB, VA = no connect
RWB, VA = no connect
TA = 25°C
Code = 0x00, VDD = 5 V
Code = 0x80
Code = 0xFF
Code = 0x00
f = 1 MHz, measured to
GND, code = 0x80
f = 1 MHz, measured to
GND, code = 0x80
VDD = 5.5 V
VA = VB = VDD/2
VDD = 5 V
VDD = 5 V
VDD = 3 V
VDD = 3 V
VIN = 0 V or 5 V
TA = 25°C
VIH = 5 V or VIL = 0 V
VDD_OTP = 5.0 V, TA = 25°C
VIH = 5 V or VIL = 0 V, VDD = 5 V
VDD = 5 V ± 10%,
code = midscale
Code = 0x80
VA = 1 V rms, VB = 0 V,
f = 1 kHz
Min
−2
−14
−20
−1.5
−2
−14
0
GND
0.7 VDD
−0.5
2.1
2.7
5.6
Typ 1
±0.1
±2
35
160
±0.1
±0.6
15
−5.5
4.5
45
60
0.01
1
5
5.7
3.5
100
±0.02
4.8
0.1
Max
+2
+14
+55
200
+1.5
+2
0
12
VDD
1
VDD + 0.5
+0.3 VDD
0.6
±1
5.5
5.8
6
33
±0.08
Unit
LSB
LSB
%
ppm/°C
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
µA
nA
V
V
V
V
µA
pF
V
V
µA
mA
µW
%/%
MHz
%
Rev. I | Page 4 of 28



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