Analog_Interfacing_to_Embedded_Microprocessors.pdf

Analog Interfacing to Embedded

Microprocessors

Real World Design

Analog Interfacing to Embedded

Microprocessors

Real World Design

Stuart Ball

Boston Oxford Auckland Johannesburg Melbourne New Delhi

Newnes is an imprint of Butterworth–Heinemann.

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Library of Congress Cataloging-in-Publication Data

Ball, Stuart R., 1956 –

Analog interfacing to embedded microprocessors : real world design / Stuart Ball.

p. cm.

ISBN 0-7506-7339-7 (pbk. : alk. paper)

1. Embedded computer systems—Design and construction. 2. Microprocessors.

I. Title.

TK7895.E42 .B33 2001

004.16—dc21

00-051961

British Library Cataloguing-in-Publication Data

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Contents

Preface ix

Introduction xi

1 System Design

Dynamic Range 1

Calibration 2

Bandwidth 5

Processor Throughput 6

Avoiding Excess Speed 7

Other System Considerations 8

Sample Rate and Aliasing 11

2 Digital-to-Analog Converters

Analog-to-Digital Converters 15

Types of ADCs 17

Sample and Hold 26

Real Parts 29

Microprocessor Interfacing 30

Serial Interfaces 36

Multichannel ADCs 41

Internal Microcontroller ADCs 41

Codecs 42

Interrupt Rate 43

Dual-Function Pins on Microcontrollers 43

Design Checklist 45

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