Datasheet

AD7927 Data Sheet
Rev. D | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings ............................................................ 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Terminology ...................................................................................... 8
Typical Performance Characteristics ........................................... 10
Control Register .............................................................................. 12
Sequencer Operation ...................................................................... 13
Shadow Register .............................................................................. 14
Circuit Information .................................................................... 15
Converter Operation .................................................................. 15
Analog Input ............................................................................... 15
ADC Transfer Function ............................................................. 16
Handling Bipolar Input Signals ................................................ 16
Typical Connection Diagram ........................................................ 17
Analog Input Selection .............................................................. 17
Digital Inputs .............................................................................. 17
V
DRIVE
............................................................................................ 18
The Reference ............................................................................. 18
Modes of Operation ....................................................................... 19
Normal Mode (PM1 = PM0 = 1) ............................................. 19
Full Shutdown (PM1 = 1, PM0 = 0) ........................................ 19
Auto Shutdown (PM1 = 0, PM0 = 1) ....................................... 20
Powering Up the AD7927 ......................................................... 21
Power vs. Throughput Rate ....................................................... 21
Serial Interface ................................................................................ 22
Writing Between Conversions .................................................. 22
Microprocessor Interfacing ........................................................... 24
AD7927 to TMS320C541 .......................................................... 24
AD7927 to ADSP-21xx .............................................................. 24
AD7927 to DSP563xx ................................................................ 25
Application Hints ........................................................................... 26
Grounding and Layout .............................................................. 26
Outline Dimensions ....................................................................... 27
Ordering Guide .......................................................................... 27
Automotive Products ................................................................. 27
REVISION HISTORY
6/13—Rev. C to Rev. D
Deleted Evaluating the AD7927 Performance Section .............. 26
Changes to Ordering Guide .......................................................... 27
12/11—Rev. B to Rev. C
Changes to Features Section............................................................ 1
Changes to Table 1 ............................................................................ 3
Changes to Table 3 ............................................................................ 6
Changes to Ordering Guide, Added Automotive Products
Section .............................................................................................. 27
12/08—Rev. A to Rev. B
Changes to ESD Parameter, Table 3 ................................................ 6
Changes to Ordering Guide .......................................................... 27
1/07—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Updated Layout ................................................................................. 8
Updated Layout .............................................................................. 10
Changes to Figure 12 Caption ...................................................... 14
Changes to Figure 13 Caption ...................................................... 15
Changes to Ordering Guide .......................................................... 27
1/03—Revision 0: Initial Version