AD7761BSTZ datasheet(2/69 Pages) AD

2 / 69 page

AD7761

Data Sheet

Rev. 0 | Page 2 of 69

TABLE OF CONTENTS

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

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

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

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

General Description ......................................................................... 3

Specifications..................................................................................... 4

Timing Specifications .................................................................. 9

1.8 V IOVDD Timing Specifications....................................... 10

Absolute Maximum Ratings.......................................................... 14

Thermal Resistance .................................................................... 14

ESD Caution................................................................................ 14

Pin Configuration and Function Descriptions........................... 15

Typical Performance Characteristics ........................................... 19

Terminology .................................................................................... 25

Theory of Operation ...................................................................... 26

Clocking, Sampling Tree, and Power Scaling ............................. 26

Noise Performance and Resolution.......................................... 27

Applications Information .............................................................. 29

Power Supplies ............................................................................ 30

Device Configuration ................................................................ 31

Pin Control Mode....................................................................... 31

SPI Control.................................................................................. 34

SPI Control Functionality ......................................................... 35

SPI Control Mode Extra Diagnostic Features ........................ 37

Circuit Information ........................................................................ 38

Core Signal Chain....................................................................... 38

Analog Inputs.............................................................................. 39

VCM............................................................................................. 40

Reference Input........................................................................... 40

Clock Selection ........................................................................... 40

Digital Filtering........................................................................... 40

Decimation Rate Control .......................................................... 42

Antialiasing ................................................................................. 42

Calibration................................................................................... 43

Data Interface.................................................................................. 45

Setting the Format of Data Output .......................................... 45

ADC Conversion Output: Header and Data .......................... 46

Functionality ................................................................................... 54

GPIO Functionality.................................................................... 54

Channel Standby Register ......................................................... 57

Channel Mode A Register ......................................................... 57

Channel Mode B Register ......................................................... 58

Channel Mode Select Register.................................................. 58

Power Mode Select Register...................................................... 59

General Device Configuration Register .................................. 59

Data Control: Soft Reset, Sync, and Single-Shot Control

Interface Configuration Register.............................................. 61

Digital Filter RAM Built in Self Test (BIST) Register............ 61

Status Register............................................................................. 62

Revision Identification Register ............................................... 62

GPIO Control Register .............................................................. 62

GPIO Write Data Register......................................................... 63

GPIO Read Data Register.......................................................... 63

Analog Input Precharge Buffer Enable Register Channel 0 to

Channel 3 .................................................................................... 64

Analog Input Precharge Buffer Enable Register Channel 4 to

Channel 7 .................................................................................... 64

Positive Reference Precharge Buffer Enable Register............ 65

Negative Reference Precharge Buffer Enable Register .......... 65

Offset Registers........................................................................... 65

Gain Registers ............................................................................. 66

Sync Phase Offset Registers ...................................................... 66

ADC Diagnostic Receive Select Register ................................ 66

ADC Diagnostic Control Register ........................................... 67

Modulator Delay Control Register........................................... 68

Chopping Control Register....................................................... 68

Outline Dimensions ....................................................................... 69

Ordering Guide .......................................................................... 69

REVISION HISTORY

4/16—Revision 0: Initial Version

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