AD7690 Analog Devices, AD7690 Datasheet - Page 2

• Manufacturer Part Number: AD7690
• Manufacturer: Analog Devices

Specifications of AD7690

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 400kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

AD7690
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Application Example ........................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications ....................................................................... 5
Absolute Maximum Ratings ............................................................ 6
Pin Configurations and Function Descriptions ........................... 7
Terminology ...................................................................................... 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
REVISION HISTORY
7/11—Rev. A to Rev. B
Changes to Common-Mode Input Range Min Parameter ......... 3
Added EPAD Note to Figure 6 and Table 6 ................................... 7
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
3/07—Rev. 0 to Rev. A
Removed Endnote Regarding QFN Package .................. Universal
Changes to Features .......................................................................... 1
Changes to Table 1 ............................................................................ 1
Changes to Figure 2 .......................................................................... 1
Changes to Gain Error in Table 2 ................................................... 3
Change to Gain Error Temperature Drift in Table 2 ................... 3
Change to Zero Temperature Drift in Table 2 .............................. 3
Changes to Power Dissipation in Table 3 ...................................... 4
ESD Caution .................................................................................. 6
Circuit Information .................................................................... 12
Converter Operation .................................................................. 12
Typical Connection Diagram ................................................... 13
Analog Inputs .............................................................................. 14
Rev. B | Page 2 of 24
Application Hints ........................................................................... 23
Outline Dimensions ....................................................................... 24
Change to Conversion Time:
Change to Acquisition Time in Table 4 .......................................... 5
Changes to Figure 12 ......................................................................... 9
Change to Figure 22 Caption ........................................................ 11
Changes to Circuit Information Section ..................................... 12
Change to Table 7 ........................................................................... 13
Change to Endnote 1 of Figure 26 ................................................ 13
Added Figure 29 ............................................................................. 14
Changes to Driver Amplifier Choice Section ............................. 14
Change to Evaluating the AD7690’s Performance Section ....... 23
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
4/06—Revision 0: Initial Version
Driver Amplifier Choice ........................................................... 14
Single-to-Differential Driver .................................................... 15
Voltage Reference Input ............................................................ 15
Power Supply ............................................................................... 16
Supplying the ADC from the Reference .................................. 16
Digital Interface .......................................................................... 16
CS Mode, 3-Wire Without Busy Indicator ............................. 17
CS Mode, 3-Wire With Busy Indicator ................................... 18
CS Mode, 4-Wire Without Busy Indicator ............................. 19
CS Mode, 4-Wire With Busy Indicator ................................... 20
Chain Mode Without Busy Indicator ...................................... 21
Chain Mode with Busy Indicator ............................................. 22
Layout .......................................................................................... 23
Evaluating the AD7690’s Performance .................................... 23
Ordering Guide .......................................................................... 24
CNV Rising Edge to Data Available in Table 4 ........................ 5