Datasheet

AD7763 Data Sheet
Rev. B | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications ....................................................................... 5
Timing Diagrams .......................................................................... 6
Absolute Maximum Ratings ............................................................ 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Terminology .................................................................................... 10
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 14
AD7763 Interface ............................................................................ 15
Reading Data Using the SPI Interface ..................................... 15
Synchronization .......................................................................... 15
Sharing the Serial Bus ................................................................ 15
Writing to the AD7763 .............................................................. 16
Reading Status and Other Registers ......................................... 17
Reading Data Using the I
2
S Interface ....................................... 18
Clocking the AD7763 ..................................................................... 19
Example 1 .................................................................................... 19
Example 2 .................................................................................... 19
Driving the AD7763 ....................................................................... 20
Using the AD7763 ...................................................................... 21
Bias Resistor Selection ............................................................... 21
Decoupling and Layout Recommendations................................ 22
Supply Decoupling ..................................................................... 23
Additional Decoupling .............................................................. 23
Reference Voltage Filtering ....................................................... 23
Differential Amplifier Components ........................................ 23
Exposed Paddle ........................................................................... 23
Layout Considerations ............................................................... 23
Programmable FIR Filter ............................................................... 24
Downloading a User-Defined Filter ............................................ 25
Example Filter Download ......................................................... 26
Registers ........................................................................................... 27
Control Register 1—Address 0x001 ......................................... 27
Control Register 2—Address 0x002 ......................................... 27
Status Register (Read Only) ...................................................... 28
Offset Register—Address 0x003 ............................................... 28
Gain Register—Address 0x004 ................................................. 28
Overrange Register—Address 0x005 ....................................... 28
Outline Dimensions ....................................................................... 29
Ordering Guide .......................................................................... 29
REVISION HISTORY
1/14—Rev. A to Rev. B
Added Exposed Pad Notation, Figure 4 and Table 5 ................... 8
Change to Figure 37 ....................................................................... 24
Updated Outline Dimensions ....................................................... 29
11/09—Rev. 0 to Rev. A
Changes to Figure 5 ........................................................................... 8
Changes to Sharing the Serial Bus Section ................................. 15
Changes to Figure 26 ...................................................................... 16
Updated Outline Dimensions ....................................................... 29
Changes to Ordering Guide .......................................................... 29
10/05—Revision 0: Initial Version