AD5245
TABLE OF CONTENTS
Features .............................................................................................. 1
Test Circuits..................................................................................... 12
Theory of Operation ...................................................................... 13
Programming the Variable Resistor......................................... 13
Programming the Potentiometer Divider............................... 14
ESD Protection ........................................................................... 14
Terminal Voltage Operating Range ......................................... 14
Power-Up Sequence ................................................................... 14
Layout and Power Supply Bypassing ....................................... 14
Constant Bias to Retain Resistance Setting............................. 15
Evaluation Board........................................................................ 15
I2C Interface .................................................................................... 16
I2C-Compatible 2-Wire Serial Bus........................................... 16
Outline Dimensions....................................................................... 19
Ordering Guide .......................................................................... 19
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Pin Configuration............................................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Electrical Characteristics................................................................. 3
5 kΩ Version.................................................................................. 3
10 kΩ, 50 kΩ, 100 kΩ Versions .................................................. 4
Timing Characteristics..................................................................... 5
5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Versions........................................ 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
REVISION HISTORY
Added Figure 37 ............................................................................ 14
Changes to Equation 4.................................................................. 14
Deleted Readback RDAC Value Section .................................... 14
Deleted Level Shifting for Bidirectional Interface Section ...... 14
Moved ESD Protection Section to Page ..................................... 14
Changes to Figure 38 and Figure 39............................................ 14
Moved Terminal Voltage Operating Range Section to Page.... 14
Changes to Figure 40..................................................................... 14
Moved Power-Up Sequence Section to Page ............................. 14
Moved Layout and Power Supply Bypassing Section to Page . 15
Added Constant Bias to Retain Resistance Setting Section..... 15
Added Figure 42 ............................................................................ 15
Added Evaluation Board Section ................................................ 15
Added Figure 43 ............................................................................ 15
Moved I2C Interface Section to Page........................................... 16
Changes to I2C Compatible 2-Wire Serial Bus Section ........... 16
Moved Table 5 and Table 6 to Page ............................................. 17
(Renumbered as Table 8 and Table 9)
1/06—Rev. A to Rev. B
Changes to Table 3........................................................................... 5
Changes to Ordering Guide .........................................................19
3/04—Rev. 0 to Rev. A
Updated Format................................................................ Universal
Changes to Features......................................................................... 1
Changes to Applications ................................................................. 1
Changes to Figure 1......................................................................... 1
Changes to Electrical Characteristics—5 kΩ Version ................ 3
Changes to Electrical Characteristics—10 kΩ, 50 kΩ,
and 100 kΩ Versions ....................................................................... 4
Changes to Timing Characteristics............................................... 5
Changes to Absolute Maximum Ratings...................................... 6
Moved ESD Caution to Page.......................................................... 6
Changes to Pin Configuration and Function Descriptions ....... 7
Changes to Figures 22 and 23 ......................................................11
Moved Figure 25 to Figure 26 ......................................................11
Moved Figure 26 to Figure 27 ......................................................11
Moved Figure 27 to Figure 25 ......................................................11
Deleted Figures 31 and 32 ............................................................12
Changes to Figure 32, Figure 33 and Figure 34 .........................12
Changes to Rheostat Operation Section.....................................13
Added Figure 35.............................................................................13
Changes to Equation 1 and Equation 2 ......................................13
Changes to Table 6 and Table 7....................................................13
Moved Figure 36, Figure 37, and Figure 38 to Page.................. 17
(Renumbered as Figure 44, Figure 45, and Figure 46)
Moved Multiply Devices on One Bus Section to Page ............. 18
Updated Ordering Guide ............................................................. 19
Updated Outline Dimensions...................................................... 19
Moved I2C Disclaimer to Page..................................................... 20
5/03—Revision 0: Initial Version
Rev. B | Page 2 of 20
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