Datasheet

AD7688
Rev. A | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Application Diagram........................................................................ 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications....................................................................... 5
Absolute Maximum Ratings............................................................ 6
Thermal Resistance...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Terminology ...................................................................................... 8
Typical Performance Characteristics ............................................. 9
Circuit Information.................................................................... 12
Converter Operation.................................................................. 12
Typical Connection Diagram ................................................... 13
Analog Input ............................................................................... 14
Driver Amplifier Choice ........................................................... 15
Single-to-Differential Driver .................................................... 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 the AD7688’s Performance.................................... 23
Outline Dimensions....................................................................... 24
Ordering Guide .......................................................................... 25
REVISION HISTORY
2/11—Rev. 0 to Rev. A
Deleted QFN in Development Note............................ Throughout
Changes to Table 5............................................................................ 6
Added Thermal Resistance Section and Table 6 .......................... 6
Changes to Figure 6 and Table 7..................................................... 7
Updated Outline Dimensions....................................................... 24
Changes to Ordering Guide .......................................................... 25
4/05—Revision 0: Initial Version