Datasheet

AD7686
Rev. B | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications....................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions........................... 7
Ter mi no lo g y ...................................................................................... 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
Circuit Information.................................................................... 12
Converter Operation.................................................................. 12
Typical Connection Diagram ................................................... 13
Analog Input ............................................................................... 14
Driver Amplifier Choice ........................................................... 15
Voltage Reference Input ............................................................ 15
Power Supply............................................................................... 15
Supplying the ADC from the Reference.................................. 16
Digital Interface.......................................................................... 16
CS
MODE 3-Wire, No Busy Indicator .................................... 17
CS
Mode 3-Wire with Busy Indicator ..................................... 18
CS
Mode 4-Wire, No Busy Indicator....................................... 19
CS
Mode 4-Wire with Busy Indicator ..................................... 20
Chain Mode, No Busy Indicator .............................................. 21
Chain Mode with Busy Indicator............................................. 22
Application Hints ........................................................................... 23
Layout .......................................................................................... 23
Evaluating Performance ............................................................ 23
True 16-Bit Isolated Application Example.............................. 24
Outline Dimensions....................................................................... 25
Ordering Guide .......................................................................... 26
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............................................. 5
Changes to Figure 13 and Figure 15............................................. 10
Changes to Figure 26...................................................................... 13
Changes to Table 8.......................................................................... 15
Changes to Figure 31...................................................................... 16
Changes to Figure 42...................................................................... 21
Changes to Figure 44...................................................................... 22
Updated Outline Dimensions....................................................... 25
Changes to Ordering Guide .......................................................... 26
4/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Updated Outline Dimensions....................................................... 25
Changes to Ordering Guide.......................................................... 26
4/05—Revision 0: Initial Version