Analog Devices Inc. ADE78x Polyphase Multifunction Energy Metering ICs
Analog Devices Inc. ADE78x Polyphase Multifunction Energy Metering ICs are high accuracy, 3-phase electrical energy measurement ICs with serial interfaces and three flexible pulse outputs. ADE78x ICs incorporate second-order Σ-Δ 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 in various 3-phase configurations, such as wye or delta services, with both three and four wires.
The devices include waveform sampling registers to allow access to all ADC outputs. ADE78x also incorporate power quality measurements, such as short duration low or high voltage detection, short duration high current variation, line voltage period measurement, and angles between phase voltages and currents. ADE78x has two interrupt request pins, IRQ0 and IRQ1, to indicate that an enabled interrupt event has occurred. For the ADE7868A/ ADE7878A, three specially designed low power modes ensure the continuity of energy accumulation when the ADE7868A/ ADE7878A are in a tampering situation.
Features
- Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards
- Compatible with 3-phase, 3- or 4-wire (delta or wye) meters and other 3-phase services
- Supplies total (fundamental and harmonic) active, reactive, and apparent energy and fundamental active/reactive energy on each phase and on the overall system
- 0.1% error (typical) in active and reactive energy over a dynamic range of 1000 to 1 at TA = 25°C
- 0.2% error (typical) in active and reactive energy over a dynamic range of 3000 to 1 at TA = 25°C
- Averaged rms measurements available in low ripple rms registers
- Supports current transformer and di/dt current sensors
- Dedicated ADC channel for neutral current input
- Estimated neutral current measurement by calculating the rms of the sum of the phase currents in all 3 phases