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AD7707 Datasheet(PDF) 3 Page - Analog Devices

Part No. AD7707
Description  3-Channel 16-Bit, Sigma-Delta ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7707 Datasheet(HTML) 3 Page - Analog Devices

 
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AD7707
Rev. B | Page 2 of 52
TABLE OF CONTENTS
Features .............................................................................................. 1
 
General Description ......................................................................... 1
 
Functional Block Diagram .............................................................. 1
 
Product Highlights ........................................................................... 1
 
Revision History ............................................................................... 3
 
Specifications..................................................................................... 4
 
Timing Characteristics ................................................................ 8
 
Absolute Maximum Ratings............................................................ 9
 
ESD Caution.................................................................................. 9
 
Pin Configuration and Function Descriptions........................... 10
 
Typical Performance Characteristics ........................................... 12
 
O tput Noise ......................................................................... ......... 14
 
Output Noise For Low Level Input Channels
(5 V Operation) .......................................................................... 14
 
Output Noise For Low Level Input Channels
(3 V Operation) .......................................................................... 15
 
Output Noise For High Level Input Channel AIN3
(5 V Operation) .......................................................................... 16
 
Output Noise For High Level Input Channel AIN3
(3 V Operation) .......................................................................... 17
 
On-Chip Registers .......................................................................... 18
 
Communications Register (RS2, RS1, RS0 = 0, 0, 0) ............. 18
 
Calibration Sequences.................................................................... 23
 
Circuit Description......................................................................... 24
 
Analog Input ................................................................................... 25
 
Analog Input Ranges.................................................................. 25
 
Input Sample Rate ...................................................................... 26
 
Bipolar/Unipolar Inputs ............................................................ 26
 
Reference Input ............................................................................... 27
 
Digital Filtering............................................................................... 28
 
Filter Characteristics .................................................................. 28
 
Postfiltering ................................................................................. 29
 
Analog Filtering .......................................................................... 29
 
Calibration....................................................................................... 30
 
Self-Calibration........................................................................... 30
 
System Calibration ..................................................................... 30
 
Span and Offset Limits on the Low Level Input Channels,
AIN1 and AIN2 .......................................................................... 31
 
Span and Offset Limits on the High Level Input Channel
AIN3............................................................................................. 31
 
Power-Up and Calibration ........................................................ 32
 
Using the AD7707 .......................................................................... 33
 
Clocking and Oscillator Circuit ............................................... 33
 
System Synchronization ............................................................ 33
 
Reset Input .................................................................................. 34
 
Standby Mode ............................................................................. 34
 
Accuracy ...................................................................................... 34
 
Drift Considerations .................................................................. 34
 
Power Supplies ................................................................................ 35
 
Supply Current............................................................................ 35
 
Grounding and Layout .............................................................. 35
 
Digital Interface .............................................................................. 36
 
Configuring the AD7707............................................................... 37
 
Microcomputer/Microprocessor Interfacing.............................. 39
 
AD7707 to 68HC11 Interface .................................................. 39
 
AD7707 to 8XC51 Interface..................................................... 40
 
Code For Setting Up the AD7707 ................................................ 41
 
C Code for Interfacing AD7707 to 68HC11........................... 41
 
Applications Information .............................................................. 43
 
Data Acquisition......................................................................... 43
 
Smart Valve/Actuator Control.................................................. 43
 
Pressure Measurement............................................................... 45
 
Thermocouple Measurement ................................................... 45
 
RTD Measurement..................................................................... 45
 
Chart Recorders.......................................................................... 46
 
Accommodating Various High Level Input Ranges .............. 46
 
Typical Input Currents............................................................... 46
 
Output Noise For High Level Input Channel, AIN3 ................. 47
 
5 V Operation ............................................................................. 47
 
3 V Operation ............................................................................. 48
 
Outline Dimensions ....................................................................... 49
 
Ordering Guide .......................................................................... 50
 


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