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AD7689ACPZRL7 Datasheet(PDF) 2 Page - Analog Devices |
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2 / 32 page AD7682/AD7689 Data Sheet Rev. D | Page 2 of 32 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 4 Timing Specifications .................................................................. 7 Absolute Maximum Ratings............................................................ 9 ESD Caution.................................................................................. 9 Pin Configurations and Function Descriptions ......................... 10 Typical Performance Characteristics ........................................... 12 Terminology .................................................................................... 15 Theory of Operation ...................................................................... 16 Overview...................................................................................... 16 Converter Operation.................................................................. 16 Transfer Functions...................................................................... 17 Typical Connection Diagrams.................................................. 18 Analog Inputs.............................................................................. 19 Driver Amplifier Choice............................................................ 21 Voltage Reference Output/Input .............................................. 21 Power Supply............................................................................... 23 Supplying the ADC from the Reference.................................. 23 Digital Interface .............................................................................. 24 Reading/Writing During Conversion, Fast Hosts.................. 24 Reading/Writing After Conversion, Any Speed Hosts.......... 24 Reading/Writing Spanning Conversion, Any Speed Host.... 24 Configuration Register, CFG .................................................... 24 General Timing Without a Busy Indicator ............................. 26 General Timing with a Busy Indicator .................................... 27 Channel Sequencer .................................................................... 28 Read/Write Spanning Conversion Without a Busy Indicator ....................................................................................................... 29 Read/Write Spanning Conversion with a Busy Indicator..... 30 Application Hints ........................................................................... 31 Layout .......................................................................................... 31 Evaluating AD7682/AD7689 Performance ............................ 31 Outline Dimensions ....................................................................... 32 Ordering Guide .......................................................................... 32 REVISION HISTORY 4/12—Rev. C to Rev. D Changes to Figure 27...................................................................... 18 Changed Internal Reference Section to Internal Reference/Temperature Sensor Section....................................... 21 Changes to Internal Reference/Temperature Sensor Section ... 21 Changed External Reference/Temperature Sensor Section to External Reference Section............................................................ 22 Changes to External Reference and Internal Buffer Section and External Reference Section............................................................ 22 Changes to REF Bit, Function Column, Table 10 ...................... 25 Updated Outline Dimensions ....................................................... 32 9/11—Rev. B to Rev. C Changes to Internal Reference Section........................................ 21 Changes to the External Reference and Internal Buffer Section.............................................................................................. 22 Changes to the External Reference/Temperature Sensor Section.............................................................................................. 22 Changes to Table 10, REF Bit Description .................................. 25 6/09—Rev. A to Rev. B Changes Table 6 ................................................................................ 8 Changes to Figure 37...................................................................... 25 Changes to Figure 38...................................................................... 26 3/09—Rev. 0 to Rev. A Changes to Features Section, Applications Section, and Figure 1 ...............................................................................................1 Added Table 2; Renumbered Sequentially .....................................3 Changed VREF to VREF .....................................................................4 Changes to Table 3.............................................................................5 Changes to Table 4.............................................................................6 Changes to Table 5.............................................................................7 Deleted Endnote 2 in Table 6...........................................................8 Changes to Figure 4, Figure 5, and Table 7 ....................................9 Changes to Figure 6, Figure 9, and Figure 10 ............................. 11 Changes to Figure 22...................................................................... 13 Changes to Overview Section and Converter Operation Section.............................................................................................. 15 Changes to Table 8.......................................................................... 16 Changes to Figure 26 and Figure 27............................................. 17 Changes to Bipolar Single Supply Section and Analog Inputs Section.............................................................................................. 18 Changes to Internal Reference/Temperature Sensor Section ... 20 Added Figure 31; Renumbered Sequentially .............................. 20 Changes to External Reference and Internal Buffer Section and External Reference Section ........................................................... 21 Added Figure 32 and Figure 33 .................................................... 21 Changes to Power Supply Section ................................................ 22 |
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