AD7768BSTZ datasheet(2/106 Pages) AD

2 / 106 page

Data Sheet

AD7768/AD7768-4

TABLE OF CONTENTS

analog.com

Rev. C | 2 of 106

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

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

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

General Description...............................................4

Specifications........................................................ 5

1.8 V IOVDD Specifications............................. 12

Timing Specifications....................................... 16

1.8 V IOVDD Timing Specifications..................17

Absolute Maximum Ratings.................................21

Thermal Resistance......................................... 21

ESD Caution.....................................................21

Pin Configurations and Function Descriptions.....22

Typical Performance Characteristics................... 30

Terminology......................................................... 40

AC Common-Mode Rejection Ratio (AC

CMRR)........................................................... 40

Gain Error.........................................................40

Gain Error Drift................................................. 40

Integral Nonlinearity (INL) Error....................... 40

Intermodulation Distortion (IMD)...................... 40

Least Significant Bit (LSB)................................40

Offset Error.......................................................40

Power Supply Rejection Ratio (PSRR)............ 40

Signal-to-Noise Ratio (SNR)............................ 40

Signal-to-Noise-and-Distortion Ratio

(SINAD).......................................................... 40

Spurious-Free Dynamic Range (SFDR)...........40

Total Harmonic Distortion (THD)...................... 40

Theory of Operation.............................................41

Clocking, Sampling Tree, and Power Scaling.. 41

Noise Performance and Resolution..................43

Applications Information...................................... 45

Power Supplies................................................ 46

Device Configuration........................................47

Pin Control .......................................................47

SPI Control.......................................................50

SPI Control Functionality .................................51

SPI Control Mode Extra Diagnostic Features...54

Circuit Information............................................... 55

Core Signal Chain ........................................... 55

Analog Inputs................................................... 56

VCM................................................................. 58

Reference Input................................................58

Clock Selection.................................................58

Digital Filtering..................................................58

Decimation Rate Control.................................. 62

Antialiasing ......................................................63

Calibration........................................................ 64

Data Interface...................................................... 66

Setting the Format of Data Output................... 66

ADC Conversion Output: Header and Data..... 67

Functionality........................................................ 75

GPIO Functionality .......................................... 75

AD7768 Register Map Details (SPI Control)....... 76

AD7768 Register Map......................................76

Channel Standby Register............................... 78

Channel Mode A Register................................ 79

Channel Mode B Register................................ 80

Channel Mode Select Register.........................80

Power Mode Select Register............................81

General Device Configuration Register............81

Data Control: Soft Reset, Sync, and Single-

Shot Control Register..................................... 82

Interface Configuration Register.......................83

Digital Filter RAM Built In Self Test (BIST)

Status Register.................................................84

Revision Identification Register........................ 84

GPIO Control Register..................................... 84

GPIO Write Data Register................................ 85

GPIO Read Data Register................................85

Analog Input Precharge Buffer Enable

Positive Reference Precharge Buffer Enable

Negative Reference Precharge Buffer

Enable Register..............................................87

Offset Registers................................................88

Gain Registers..................................................88

Sync Phase Offset Registers........................... 89

ADC Diagnostic Receive Select Register.........89

ADC Diagnostic Control Register..................... 90

Modulator Delay Control Register.................... 90

Chopping Control Register............................... 91

AD7768-4 Register Map Details (SPI Control).... 92

AD7768-4 Register Map...................................92

Channel Standby Register............................... 94

Channel Mode A Register................................ 95

Channel Mode B Register................................ 95

Channel Mode Select Register.........................96

Power Mode Select Register............................96

General Device Configuration Register............97

Data Control: Soft Reset, Sync, and Single-

Shot Control Register..................................... 97

Interface Configuration Register.......................98

AD7768BSTZ Datasheet(PDF) 2 Page - Analog Devices

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