Datasheet ADE7761B (Analog Devices) - 5

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ADE7761B ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3. PERFORMANCE ISSUES THAT MAY AFFECT Parameter Rating BILLING ACCURACY
VDD to AGND −0.3 V to +7 V The ADE7761B provides pulse outputs, CF, F1, and F2, that are Analog Input Voltage to AGND −6 V to +6 V intended to be used for the billing of active energy. Pulses are V1A, V1B, V1N, V2N, V2P, MISCAL generated at these outputs in two different situations. Reference Input Voltage to AGND −0.3 V to VDD + 0.3 V
Case 1
Digital Input Voltage to DGND −0.3 V to VDD + 0.3 V Digital Output Voltage to DGND −0.3 V to V When the analog input V2P − V2N complies with the conditions DD + 0.3 V Operating Temperature Range described in Figure 34, the CF, F1, and F2 frequencies are Industrial −40°C to +85°C proportional to active power and can be used to bill active energy. Storage Temperature Range −65°C to +150°C
Case 2
Junction Temperature 150°C When the analog input V2P − V2N does not comply with the 20-Lead SSOP, Power Dissipation 450 mW conditions described in Figure 34, the ADE7761B does not θJA Thermal Impedance 112°C/W measure active energy but a quantity proportional to kiloampere- Lead Temperature, Soldering hours (kAh). This quantity is used to generate pulses on the Vapor Phase (60 sec) 215°C same CF, F1, and F2. This situation is indicated when the Infrared (15 sec) 220°C FAULT pin is high. Stresses above those listed under Absolute Maximum Ratings Analog Devices, Inc., cautions users of the ADE7761B about the may cause permanent damage to the device. This is a stress following: rating only; functional operation of the device at these or any • Billing active energy in Case 1 is consistent with the under- other conditions above those indicated in the operational standing of the quantity represented by pulses on the CF, F1, section of this specification is not implied. Exposure to absolute and F2 outputs (watthour). maximum rating conditions for extended periods may affect • device reliability. Billing active energy while the ADE7761B is in Case 2 must be decided knowing that the entity measured by the ADE7761B in this case is ampere-hour and not watthour. Users should be aware of this limitation and decide if the ADE7761B is appropriate for their application.
ESD CAUTION
Rev. 0 | Page 5 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Timing Diagram ABSOLUTE MAXIMUM RATINGS PERFORMANCE ISSUES THAT MAY AFFECT BILLING ACCURACY Case 1 Case 2 ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY THEORY OF OPERATION POWER SUPPLY MONITOR ANALOG INPUTS Channel V1 (Current Channel) Channel V2 (Voltage Channel) MISCAL Input Typical Connection Diagrams INTERNAL OSCILLATOR ANALOG-TO-DIGITAL CONVERSION Antialias Filter ACTIVE POWER CALCULATION Power Factor Considerations Nonsinusoidal Voltage and Current HPF and Offset Effects DIGITAL-TO-FREQUENCY CONVERSION TRANSFER FUNCTION Frequency Output F1 and Frequency Output F2 Frequency Output CF FAULT DETECTION Fault with Active Input Greater Than Inactive Input Fault with Inactive Input Greater Than Active Input Calibration Concerns MISSING NEUTRAL MODE Important Note for Billing of Active Energy Missing Neutral Detection Missing Neutral Gain Calibration APPLICATIONS INFORMATION INTERFACING TO A MICROCONTROLLER FOR ENERGY MEASUREMENT SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION Frequency Outputs No-Load Threshold NEGATIVE POWER INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE