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3 / 29 page AD7685 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Typical Application Circuit ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications....................................................................... 5 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Terminology ...................................................................................... 9 Typical Performance Characteristics ........................................... 10 Theory of Operation ...................................................................... 13 Circuit Information.................................................................... 13 Converter Operation.................................................................. 13 Typical Connection Diagram.................................................... 14 Analog Inputs.............................................................................. 15 Driver Amplifier Choice ........................................................... 16 Voltage Reference Input ............................................................ 16 Power Supply............................................................................... 16 Supplying the ADC from the Reference.................................. 17 Digital Interface.......................................................................... 17 CS Mode 3-Wire, No BUSY Indicator..................................... 18 CS Mode 3-Wire with BUSY Indicator ................................... 19 CS Mode 4-Wire, No BUSY Indicator..................................... 20 CS Mode 4-Wire with BUSY Indicator ................................... 21 Chain Mode, No BUSY Indicator ............................................ 22 Chain Mode with BUSY Indicator........................................... 23 Application Hints ........................................................................... 24 Layout .......................................................................................... 24 Evaluating the Performance of the AD7685............................... 24 True 16-Bit Isolated Application Example.............................. 25 Outline Dimensions....................................................................... 26 Ordering Guide .......................................................................... 27 REVISION HISTORY 7/14—Rev. C to Rev. D Deleted QFN .................................................................. Throughout Changed Application Diagram to Typical Application Circuit ................................................................................................ 1 Change to Features Section ............................................................. 1 Added Patent Note, Note 1.............................................................. 1 Changes to Evaluating the Performance of the AD7685 Section.............................................................................................. 24 Updated Outline Dimensions....................................................... 26 Changes to Ordering Guide .......................................................... 27 8/11—Rev. B to Rev. C Changes to Figure 6 and Table 7..................................................... 8 Updated Outline Dimensions....................................................... 26 Changes to Ordering Guide .......................................................... 27 3/07—Rev. A to Rev. B Changes to Features and Table 1..................................................... 1 Changes to Table 3............................................................................ 4 Moved Figure 3 and Figure 4 to Page............................................. 6 Inserted Figure 6; Renumbered Sequentially................................ 8 Changes to Figure 13 and Figure 14............................................. 11 Changes to Figure 27...................................................................... 14 Changes to Table 9.......................................................................... 16 Changes to Figure 32...................................................................... 17 Changes to Figure 43...................................................................... 22 Changes to Figure 45...................................................................... 23 Updated Outline Dimensions....................................................... 26 Changes to Ordering Guide.......................................................... 27 12/04—Rev. 0 to Rev. A Changes to Specifications.................................................................3 Changes to Figure 17 Captions..................................................... 11 Changes to Power Supply Section ................................................ 17 Changes to Digital Interface Section ........................................... 18 Changes to CS Mode 4-Wire No Busy Indicator Section ......... 21 Changes to CS Mode 4-Wire with Busy Indicator Section....... 22 Changes to Chain Mode, No Busy Indicator Section................ 23 Changes to Chain Mode with Busy Indicator Section .............. 24 Added True 16-Bit Isolated Application Example Section ....... 26 Added Figure 47 ............................................................................. 26 Changes to Ordering Guide.......................................................... 28 4/04—Revision 0: Initial Revision Rev. D | Page 2 of 28 |
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