AD7691 Analog Devices, AD7691 Datasheet - Page 2

• Manufacturer Part Number: AD7691
• Manufacturer: Analog Devices

Specifications of AD7691

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

AD7691
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Application Diagram........................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
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 8................................... 8
Updated Outline Dimensions ....................................................... 25
11/07—Rev. 0 to Rev. A
Deleted QFN Package in Development References .......Universal
Changes to Features, Applications, Figure 1 and Figure 2 .......... 1
Changes to Accuracy, Table 2.......................................................... 3
Changes to Power Dissipation, Table 3.......................................... 4
Added Thermal Resistance Section ............................................... 7
Changes to Figure 22...................................................................... 11
Changes to Format ......................................................................... 12
Changes to Terminology Section.................................................. 13
Changes to Format and Figure 29 ................................................ 15
Inserted Figure 31........................................................................... 15
Changes to Format ......................................................................... 17
Changes to Figure 44...................................................................... 22
Changes to Figure 46...................................................................... 23
Updated QFN Outline Dimensions ............................................. 25
Changes to Ordering Guide .......................................................... 25
7/06—Revision 0: Initial Version
Timing Specifications .................................................................. 5
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Circuit Information.................................................................... 14
Converter Operation.................................................................. 14
Typical Connection Diagram ................................................... 15
Analog Inputs.............................................................................. 15
Rev. B | Page 2 of 28
Application Hints ........................................................................... 24
Outline Dimensions ....................................................................... 25
Driver Amplifier Choice ........................................................... 16
Single-to-Differential Driver .................................................... 16
Voltage Reference Input ............................................................ 16
Power Supply............................................................................... 17
Supplying the ADC from the Reference.................................. 17
Digital Interface.......................................................................... 17
CS Mode, 3-Wire Without Busy Indicator ............................. 18
CS Mode, 3-Wire with Busy Indicator .................................... 19
CS Mode, 4-Wire Without Busy Indicator ............................. 20
CS Mode, 4-Wire with Busy Indicator .................................... 21
Chain Mode Without Busy Indicator ...................................... 22
Chain Mode with Busy Indicator ............................................. 23
Layout .......................................................................................... 24
Evaluating the AD7691 Performance ...................................... 24
Ordering Guide .......................................................................... 25