AD7685 Analog Devices, AD7685 Datasheet - Page 2

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AD7685

Manufacturer Part Number
AD7685
Description
Manufacturer
Analog Devices
Datasheet

Specifications of AD7685

Resolution (bits)
16bit
# Chan
1
Sample Rate
250kSPS
Interface
Ser,SPI
Analog Input Type
Diff-Uni
Ain Range
(Vref) p-p
Adc Architecture
SAR
Pkg Type
CSP,SOP

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AD7685
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Application Diagram........................................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications....................................................................... 5
Absolute Maximum Ratings............................................................ 7
Pin Configuration and Function Descriptions............................. 8
Terminology ...................................................................................... 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 13
REVISION HISTORY
8/11—Rev. B to Rev. C
Changes to Figure 6 and Table 7..................................................... 8
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
3/07—Rev. A to Rev. B
Changes to Features and Table 1 .................................................... 1
Changes to Table 3............................................................................ 4
Moved Figure 3 and Figure 4 to Page............................................. 6
Inserted Figure 6; Renumbered Sequentially................................ 8
Changes to Figure 13 and Figure 14............................................. 11
Changes to Figure 27...................................................................... 14
Changes to Table 9.......................................................................... 16
Changes to Figure 32...................................................................... 17
Changes to Figure 43...................................................................... 22
Changes to Figure 45...................................................................... 23
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
ESD Caution.................................................................................. 7
Circuit Information.................................................................... 13
Converter Operation.................................................................. 13
Typical Connection Diagram ................................................... 14
Analog Inputs.............................................................................. 15
Rev. C | Page 2 of 28
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Application Hints ........................................................................... 24
Outline Dimensions ....................................................................... 26
12/04—Rev. 0 to Rev. A
Changes to Specifications.................................................................3
Changes to Figure 17 Captions..................................................... 11
Changes to Power Supply Section ................................................ 17
Changes to Digital Interface Section ........................................... 18
Changes to CS Mode 4-Wire No Busy Indicator Section ......... 21
Changes to CS Mode 4-Wire with Busy Indicator Section....... 22
Changes to Chain Mode, No Busy Indicator Section................ 23
Changes to Chain Mode with Busy Indicator Section .............. 24
Added True 16-Bit Isolated Application Example Section ....... 26
Added Figure 47 ............................................................................. 26
Changes to Ordering Guide .......................................................... 28
4/04—Revision 0: Initial Revision
Driver Amplifier Choice ........................................................... 16
Voltage Reference Input ............................................................ 16
Power Supply............................................................................... 16
Supplying the ADC from the Reference.................................. 17
Digital Interface.......................................................................... 17
CS Mode 3-Wire, No BUSY Indicator..................................... 18
CS Mode 3-Wire with BUSY Indicator ................................... 19
CS Mode 4-Wire, No BUSY Indicator..................................... 20
CS Mode 4-Wire with BUSY Indicator ................................... 21
Chain Mode, No BUSY Indicator ............................................ 22
Chain Mode with BUSY Indicator........................................... 23
Layout .......................................................................................... 24
Evaluating the Performance of the AD7685............................... 24
True 16-Bit Isolated Application Example .............................. 25
Ordering Guide .......................................................................... 27
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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