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¡¡¡¡The ADE7854A/ADE7858A/ADE7868A/ADE7878A are high accuracy£¬ 3-phase electrical energy measurement ICs with serial interfaces and three flexible pulse outputs. The devices incorporate second-order ¦²-? analog-to-digital converters £¨ADCs£©£¬ a digital integrator£¬ reference circuitry£¬ and all signal processing required to perform total £¨fundamental and harmonic£© active£¬ reactive £¨ADE7858A£¬ ADE7868A£¬ and ADE7878A£©£¬ and apparent energy measurement and rms calculations.The ADE7878A can also perform fundamental-only active and reactive energy measurement and rms calculations. A fixed function digital signal processor £¨DSP£© executes the signal processing. The DSP program is stored in the internal ROM memory. The ADE7854A/ADE7858A/ADE7868A/ADE7878A can measure active£¬ reactive£¬ and apparent energy in various 3-phase configurations£¬ such as wye or delta services£¬ with both three and four wires. Aside from regular rms measurements£¬ which are updated every 8 kHz£¬ these devices measure low ripple rms values£¬ which are averaged internally and updated every 1.024 sec. The devices provide system calibration features for each phase£¬ that is£¬ rms offset correction£¬ phase calibration£¬ and gain calibration. The CF1£¬ CF2£¬ and CF3 logic outputs provide a wide selection of power information. All four devices provide total active and apparent powers£¬ as well as the sum of the current rms values; the ADE7858A£¬ ADE7868A£¬ and ADE7878A also provide total reactive powers; whereas the ADE7878A provides fundamental active and reactive powers.