AD7747

Preliminary Technical Data

Rev. PrC | Page 2 of 20

TABLE OF CONTENTS

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

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

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

Pin Configurations and Function Descriptions ........................... 7

Typical Performance Characteristics ............................................. 8

Output Noise and Resolution Specifications ................................ 9

Serial Interface ................................................................................ 10

Read Operation........................................................................... 10

Write Operation.......................................................................... 10

AD7747 Reset ............................................................................. 11

General Call................................................................................. 11

Register Descriptions ..................................................................... 12

Status Register ............................................................................. 13

Cap Data Register....................................................................... 13

VT Data Register ........................................................................ 13

Cap Set-Up Register................................................................... 14

VT Set-Up Register .................................................................... 14

EXC Set-Up Register.................................................................. 15

Configuration Register .............................................................. 16

Cap DAC A Register .................................................................. 17

Cap DAC B Register................................................................... 17

Cap Offset Calibration Register ............................................... 17

Cap Gain Calibration Register.................................................. 17

Volt Gain Calibration Register ................................................. 17

Circuit Description ........................................................................ 18

Typical Application Diagram.................................................... 18

Outline Dimensions ....................................................................... 19

REVISION HISTORY

March 2005—Revision PrB: Preliminary sampling, chip rev.S2

July 2006—Revision PrC: Preliminary sampling, chip rev.S3