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AD7949 Datasheet(PDF) 2 Page - Analog Devices

Part # AD7949
Description  14-Bit, 8-Channel, 250 kSPS PulSAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7949 Datasheet(HTML) 2 Page - Analog Devices

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AD7949
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
 
Absolute Maximum Ratings............................................................ 7
 
ESD Caution.................................................................................. 7
 
Pin Configuration and Function Descriptions............................. 8
 
Typical Performance Characteristics ............................................. 9
 
Terminology .................................................................................... 12
 
Theory of Operation ...................................................................... 13
 
Overview...................................................................................... 13
 
Converter Operation.................................................................. 13
 
Transfer Functions...................................................................... 14
 
Typical Connection Diagrams.................................................. 15
 
Analog Inputs.............................................................................. 16
 
Driver Amplifier Choice............................................................ 18
 
Voltage Reference Output/Input .............................................. 18
 
Power Supply............................................................................... 20
 
Supplying the ADC from the Reference.................................. 20
 
Digital Interface .............................................................................. 21
 
Reading/Writing During Conversion, Fast Hosts.................. 21
 
Reading/Writing After Conversion, Any Speed Hosts.......... 21
 
Reading/Writing Spanning Conversion, Any Speed Host.... 21
 
Configuration Register, CFG .................................................... 21
 
General Timing Without a Busy Indicator ............................. 23
 
General Timing with a Busy Indicator .................................... 24
 
Channel Sequencer .................................................................... 25
 
Read/Write Spanning Conversion Without a Busy Indicator
....................................................................................................... 26
 
Read/Write Spanning Conversion with a Busy Indicator..... 27
 
Application Hints ........................................................................... 28
 
Layout .......................................................................................... 28
 
Evaluating AD7949 Performance............................................. 28
 
Outline Dimensions ....................................................................... 29
 
Ordering Guide .......................................................................... 29
 
REVISION HISTORY
5/09—Rev. A to Rev. B
Changes to Features Section, Applications Section, and
Figure 1 .............................................................................................. 1
Changes to Specifications Section .................................................. 3
Changes to Timing Specifications Section.................................... 5
Changes to Table 5............................................................................ 7
Changes to Figure 4 and Table 6..................................................... 8
Changes to Figure 20...................................................................... 11
Changes to Converter Operation Section ................................... 13
Changes to Table 7.......................................................................... 14
Changes to Figure 25 and Figure 26............................................. 15
Changes to Bipolar Single Supply Section, Input Structure
Section, and Selectable Low-Pass Filter Section......................... 16
Changes to Input Configurations Section, Sequencer Section,
and Source Resistance Section...................................................... 17
Changes to Internal Reference/Temperature Sensor Section ... 18
Added Figure 30; Renumbered Sequentially .............................. 18
Changes to External Reference and Internal Buffer Section,
External Reference Section, and Reference Decoupling
Section.............................................................................................. 19
Added Figure 31 and Figure 32..................................................... 19
Changes to Power Supply Section ................................................ 20
Changed Reading/Writing During Conversion, Fast Hosts
Section to Reading/Writing After Conversion,
Any Speed Hosts............................................................................. 21
Changes to Configuration Register, CFG Section and
Table 9 .............................................................................................. 22
Added General Timing Without a Busy Indicator Section and
Figure 36 .......................................................................................... 23
Added General Timing with a Busy Indicator Section and
Figure 37 .......................................................................................... 24
Added Channel Sequencer Section, Examples Section, and
Figure 38 .......................................................................................... 25
Changes to Read/Write Spanning Conversion Without a Busy
Indicator Section and Figure 40 ................................................... 26
Changes to Read/Write Spanning Conversion with a Busy
Indicator Section and Figure 42 ................................................... 27
Changes to Evaluating AD7949 Performance Section .............. 28
Added Exposed Pad Notation to Outline Dimensions ............. 29
Changes to Ordering Guide .......................................................... 29
5/08—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 26
5/08—Revision 0: Initial Version


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