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AD7890

LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System

Analog Devices 

AD7890

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

Terminology ...................................................................................... 9

Control Register.............................................................................. 10

Theory of Operation ...................................................................... 11

Converter Details........................................................................ 11

Circuit Description..................................................................... 11

Track/Hold Amplifier ................................................................ 12

Reference ..................................................................................... 13

Timing and Control ................................................................... 13

CEXT Functioning......................................................................... 16

REVISION HISTORY

9/06—Rev. B to Rev. C

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

Changes to Table 1............................................................................ 3

Updated Outline Dimensions ....................................................... 25

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

2/01—Rev. A to Rev. B

Serial Interface ................................................................................ 17

Self-Clocking Mode ................................................................... 17

External Clocking Mode ........................................................... 18

Simplifying the Interface ........................................................... 19

Microprocessor/Microcontroller Interface ................................. 20

AD7890 to 8051 Interface ......................................................... 20

AD7890 to 68HC11 Interface ................................................... 20

AD7890 to ADSP-2101 Interface ............................................. 21

AD7890 to DSP56000 Interface ............................................... 21

AD7890 to TMS320C25/30 Interface...................................... 21

Antialiasing Filter....................................................................... 22

Performance .................................................................................... 23

Linearity....................................................................................... 23

Noise ............................................................................................ 23

Dynamic Performance............................................................... 24

Effective Number of Bits ........................................................... 24

Outline Dimensions ....................................................................... 25

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

Rev. C | Page 2 of 28

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