ADE7978 datasheet(2/125 Pages) AD

2 / 125 page

ADE7978/ADE7933/ADE7932/ADE7923

Data Sheet

Rev. D | Page 2 of 125

TABLE OF CONTENTS

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

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

Typical Application Circuit ............................................................. 1

Revision History ............................................................................... 4

General Description ......................................................................... 5

Functional Block Diagrams............................................................. 6

Specifications..................................................................................... 8

System Specifications, ADE7978 and

ADE7933/ADE7932/ADE7923 .................................................. 8

ADE7978 Specifications ............................................................ 10

ADE7933/ADE7932 Specifications.......................................... 14

ADE7923 Specifications ............................................................ 17

Absolute Maximum Ratings.......................................................... 19

Thermal Resistance .................................................................... 19

ESD Caution................................................................................ 19

Pin Configurations and Function Descriptions ......................... 20

Typical Performance Characteristics ........................................... 25

Total Energy Linearity over Supply and Temperature........... 25

Fundamental Energy and RMS Linearity with Fifth

Harmonic over Supply and Temperature ................................ 26

Total Energy Error over Frequency.......................................... 27

RMS Linearity over Temperature and RMS Error over

Frequency .................................................................................... 28

Energy Linearity Repeatability ................................................. 29

Cumulative Histograms of ADC Gain Temperature

Coefficients.................................................................................. 30

Test Circuit ...................................................................................... 31

Terminology .................................................................................... 32

Theory of Operation ...................................................................... 35

ADE7933/ADE7932/ADE7923 Analog Inputs ...................... 35

Analog-to-Digital Conversion.................................................. 35

Current Channel ADC............................................................... 37

Voltage Channel ADCs.............................................................. 39

Changing the Phase Voltage Datapath .................................... 44

Reference Circuits ...................................................................... 44

Phase Compensation.................................................................. 45

Digital Signal Processor............................................................. 46

Power Quality Measurements....................................................... 47

Zero-Crossing Detection........................................................... 47

Period Measurement.................................................................. 49

Phase Voltage Sag Detection..................................................... 50

Peak Detection............................................................................ 51

Overvoltage and Overcurrent Detection ................................ 52

Neutral Current Mismatch........................................................ 53

Root Mean Square Measurement................................................. 54

Current RMS Calculation ......................................................... 54

Voltage RMS Calculation .......................................................... 55

Voltage RMS in Delta Configurations..................................... 56

Active Power Calculation .............................................................. 57

Total Active Power Calculation ................................................ 57

Fundamental Active Power Calculation.................................. 58

Active Power Gain Calibration................................................. 58

Active Power Offset Calibration............................................... 59

Sign of Active Power Calculation............................................. 59

Active Energy Calculation ........................................................ 59

Integration Time Under Steady Load...................................... 60

Energy Accumulation Modes ................................................... 61

Line Cycle Active Energy Accumulation Mode ..................... 61

Reactive Power Calculation .......................................................... 63

Total Reactive Power Calculation ............................................ 63

Fundamental Reactive Power Calculation.............................. 63

Reactive Power Gain Calibration ............................................. 63

Reactive Power Offset Calibration........................................... 63

Sign of Reactive Power Calculation ......................................... 64

Reactive Energy Calculation..................................................... 64

Integration Time Under Steady Load...................................... 65

Energy Accumulation Modes ................................................... 66

Line Cycle Reactive Energy Accumulation Mode ................. 66

Apparent Power Calculation......................................................... 67

Apparent Power Gain Calibration............................................ 67

Apparent Power Offset Calibration ......................................... 67

Apparent Power Calculation Using VNOM........................... 67

Apparent Energy Calculation ................................................... 68

Integration Time Under Steady Load...................................... 69

Energy Accumulation Mode..................................................... 69

Line Cycle Apparent Energy Accumulation Mode................ 69

Power Factor Calculation and Total Harmonic Distortion

Calculation ...................................................................................... 70

Power Factor Calculation.......................................................... 70

Total Harmonic Distortion Calculation.................................. 71

Waveform Sampling Mode............................................................ 72

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