AD7985 Просмотр технического описания (PDF) - Analog Devices

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AD7985

16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

Analog Devices 

AD7985

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Application Diagram........................................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Specifications .................................................................. 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 9

Terminology .................................................................................... 12

Theory of Operation ...................................................................... 13

Circuit Information.................................................................... 13

Converter Operation.................................................................. 13

Conversion Modes of Operation.............................................. 13

Typical Connection Diagram ................................................... 14

REVISION HISTORY

3/16—Rev. B to Rev. C

Changes to Table 1............................................................................ 1

Change to Endnote 3, Table 1 ......................................................... 3

Change to Signal-to-Noise-and-Distortion Ratio Parameter,

Table 2 ................................................................................................ 3

Deleted Endnote 4, Table 2.............................................................. 3

Changes to Figure 4 .......................................................................... 7

Changes to Figure 23...................................................................... 14

Changes to Driver Amplifier Choice Section ............................. 15

Change to Reference Decoupling Section ................................... 16

Changes to Reading During Conversion, Fast Host (Turbo or

Normal Mode) Section and Split-Reading, Any Speed Host

(Turbo or Normal Mode) Section ................................................ 18

Changes to Figure 31...................................................................... 21

Updated Outline Dimensions ....................................................... 27

Changes to Ordering Guide .......................................................... 27

Data Sheet

Analog Inputs ............................................................................. 15

Driver Amplifier Choice ........................................................... 15

Voltage Reference Input ............................................................ 16

Power Supply............................................................................... 16

Digital Interface .............................................................................. 17

Data Reading Options ............................................................... 18

CS Mode, 3-Wire Without Busy Indicator ............................. 19

CS Mode, 3-Wire with Busy Indicator .................................... 20

CS Mode, 4-Wire Without Busy Indicator ............................. 21

CS Mode, 4-Wire with Busy Indicator .................................... 22

Chain Mode Without Busy Indicator ...................................... 23

Chain Mode with Busy Indicator ............................................. 24

Applications Information .............................................................. 25

Layout .......................................................................................... 25

Evaluating the AD7985 Performance ...................................... 25

Outline Dimensions ....................................................................... 27

Ordering Guide .......................................................................... 27

7/14—Rev. A to Rev. B

Added Patent Endnote......................................................................1

Changes to Figure 21...................................................................... 13

Changes to Data Reading Options Section................................. 18

Updated Outline Dimensions ....................................................... 27

8/10—Rev. 0 to Rev. A

Change to Table 4, Conversion Time: CNV Rising Edge

to Data Available................................................................................5

9/09—Revision 0: Initial Version

Rev. C | Page 2 of 28

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