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AD7685BRM Datasheet(PDF) 2 Page - Analog Devices |
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AD7685BRM Datasheet(HTML) 2 Page - Analog Devices |
2 / 28 page AD7685 Rev. B | Page 2 of 28 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Application Diagram........................................................................ 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 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 |
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