AD7682 Analog Devices, AD7682 Datasheet - Page 2

• Manufacturer Part Number: AD7682
• Manufacturer: Analog Devices

Specifications of AD7682

• Resolution (bits): 16bit
• # Chan: 4
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Bip,SE-Uni
• Ain Range: Bip (Vref) x 0.5,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: CSP

AD7682/AD7689
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 9
Pin Configurations and Function Descriptions ......................... 10
Typical Performance Characteristics ........................................... 12
Terminology .................................................................................... 15
Theory of Operation ...................................................................... 16
REVISION HISTORY
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 V
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
Timing Specifications .................................................................. 7
ESD Caution.................................................................................. 9
Overview...................................................................................... 16
Converter Operation.................................................................. 16
Transfer Functions...................................................................... 17
Typical Connection Diagrams.................................................. 18
Analog Inputs.............................................................................. 19
Driver Amplifier Choice............................................................ 21
REF
.................................................................... 4
Rev. C | Page 2 of 32
Digital Interface .............................................................................. 24
Application Hints ........................................................................... 31
Outline Dimensions ....................................................................... 32
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
Changes to Digital Interface Section, Reading/Writing After
Conversion, Any Speed Hosts Section, and Configuration
Register, CFG Section .................................................................... 23
Changes to Table 10 ....................................................................... 24
Added General Timing Without a Busy Indicator Section and
Figure 37 .......................................................................................... 25
Added General Timing With a Busy Indicator Section and
Figure 38 .......................................................................................... 26
Voltage Reference Output/Input .............................................. 21
Power Supply............................................................................... 23
Supplying the ADC from the Reference.................................. 23
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
Layout .......................................................................................... 31
Evaluating AD7682/AD7689 Performance ............................ 31
Ordering Guide .......................................................................... 32
Data Sheet