EVAL-AD7689EDZ Datasheet, PDF (2/32 Pages) Analog Devices – 16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC

AD7682/AD7689
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
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
Data Sheet
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
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
Rev. D | Page 2 of 32