Datasheet

AD7762 Data Sheet
Rev. A | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications ....................................................................... 5
Timing Diagrams .......................................................................... 5
Absolute Maximum Ratings ............................................................ 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Terminology ...................................................................................... 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 13
AD7762 Interface ............................................................................ 14
Reading Data ............................................................................... 14
Sharing the Parallel Bus ............................................................. 14
Writing to the AD7762 .............................................................. 14
Reading Status and Other Registers ......................................... 14
Clocking the AD7762 ................................................................ 15
Example 1 .................................................................................... 15
Example 2 .................................................................................... 15
Driving the AD7762 ....................................................................... 16
Using the AD7762 ...................................................................... 17
Bias Resistor Selection ............................................................... 17
Decoupling and Layout Recommendations................................ 18
Supply Decoupling ..................................................................... 19
Additional Decoupling .............................................................. 19
Reference Voltage Filtering ....................................................... 19
Differential Amplifier Components ........................................ 19
Layout Considerations ............................................................... 19
Programmable FIR Filter ............................................................... 20
Downloading a User-Defined Filter ............................................ 21
Example Filter Download ......................................................... 21
AD7762 Registers ........................................................................... 23
Control Register 1—Reg 0x0001 .............................................. 23
Control Register 2—Address 0x0002 ...................................... 23
Status Register (Read Only) ...................................................... 24
Offset Register—Address 0x0003 ............................................. 24
Gain Register—Address 0x0004 ............................................... 24
Overrange Register—Address 0x0005 ..................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
REVISION HISTORY
1/14—Rev. 0 to Re v. A
Added Exposed Pad Notation, Figure 4 and Table 5…………...7
Change to Figure 31……………………………………………20
Updated Outline Dimensions…………………………………25
8/05—Revision 0: Initial Version