AD420 查看數據表（PDF） - Analog Devices

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AD420

Serial Input 16-Bit 4 mA–20 mA, 0 mA–20 mA DAC

Analog Devices 

AD420

TABLE OF CONTENTS

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

Functional Block Diagram .............................................................. 1

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

Product Highlights ........................................................................... 1

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

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

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Timing Requirements ...................................................................... 7

Three-Wire Interface ................................................................... 7

Three-Wire Interface Fast Edges on Digital Input................... 7

Asynchronous Interface............................................................... 7

Terminology ...................................................................................... 8

Theory of Operation ........................................................................ 9

Applications Information .............................................................. 10

Current Output ........................................................................... 10

REVISION HISTORY

3/15—Rev. H to Rev. I

Changes to Three-Wire Interface Fast Edges on Digital Input

Section................................................................................................ 7

1/11—Rev. G to Rev. H

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

Changes to Ordering Guide .......................................................... 15

11/09—Rev. F to Rev. G

Updated Format..................................................................Universal

Changes to Table 2............................................................................ 5

Updated Outline Dimensions ....................................................... 15

Changes to Ordering Guide .......................................................... 15

9/99—Rev. E to Rev. F

Data Sheet

Driving Inductive Loads............................................................ 10

Voltage-Mode Output................................................................ 10

Optional Span and Zero Trim .................................................. 10

Three-Wire Interface ................................................................. 11

Using Multiple DACS with Fault Detect ................................. 11

Asynchronous Interface Using Optocouplers ........................ 11

Microprocessor Interface............................................................... 12

AD420-To-MC68HC11 (SPI Bus) Interface........................... 12

AD420 to Microwire Interface ................................................. 12

External Boost Function............................................................ 13

AD420 Protection........................................................................... 14

Transient Voltage Protection .................................................... 14

Board Layout And Grounding ................................................. 14

Power Supplies and Decoupling ............................................... 14

Outline Dimensions ....................................................................... 15

Ordering Guide .......................................................................... 15

Rev. I | Page 2 of 16

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