The ADE7854, ADE7858, ADE7868, and ADE7878 from Analog Devices are high accuracy, 3-phase electrical energy measurement ICs with serial interfaces and three flexible pulse outputs.
Incorporated into these devices are second-order sigma-delta (Σ-Δ) analogue-to-digital converters (ADCs), a digital integrator and reference circuitry. In addition these ICs have the signal processing required to perform energy measurement and rms calculations. A fixed function digital signal processor (DSP) executes this processing, with the DSP program being stored in the internal ROM memory.
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), and other 3-phase services
Supports current transformer and di/dt current sensors
Supplies sampled waveform data on all three phases and on neutral current
Selectable no load threshold levels for total and fundamental active and reactive powers, as well as for apparent powers
Battery supply input for missing neutral operation
Phase angle measurements in both current and voltage channels with a typical 0.3° error
Flexible I2C, SPI, and HSDC serial interfaces
Less than 0.1% error in active and reactive energy over a dynamic range of 1000 to 1 at TA = 25°C
Less than 0.2% error in active and reactive energy over a dynamic range of 3000 to 1 at TA = 25°C
Less than 0.1% error in voltage and current rms over a dynamic range of 1000 to 1 at TA = 25°C
Feature
- 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
- See datasheet for additional features
(Picture: Pinout)
