Analog Devices Inc. ADE9078 High-Performance AFEs
Analog Devices Inc. ADE9078 High-Performance AFEs are designed as highly accurate, fully integrated energy metering devices. The AFEs interface with current transformer (CT) and Rogowski coil sensors. Designers can use the ADE9078 AFEs to develop a 3-phase metrology platform that achieves high performance for Class 1 up to Class 0.2 meters. With the ADE9078 AFEs from Analog Devices, designers can enable one platform to cover a wide range of meters using high-end metrology features and superior analog performance.
Fully Integrated Design
The design of the AFEs integrates seven high-performance analog-to-digital converters (ADCs) and a flexible DSP core. ADE9078's integrated high-end reference ensures low drift over temperature with a combined drift of less than ±25ppm/°C maximum per channel.
Integrated Flexible Waveform Buffer
The ADE9078 AFEs also include an integrated, flexible waveform buffer. The flexible waveform buffer stores samples at a fixed data rate or a sampling rate that varies based on online frequency to deliver 64 points per line cycle. The fixed data and sampling rate options allow designers to implement harmonic analysis in an external processor according to IEC 61000-4-7.
Two Power Modes Detect Meter Tampering
The ADE9078 AFEs offer two power modes to detect meter tampering. The PSM2 power mode uses a low-power comparator to compare current channels to a threshold. The PSM2 power mode then indicates whether the threshold is exceeded on the IRQ0 and IRQ1 outputs. The PSM1 power mode enables fast measurement of current and voltage RMS (xVRMS and xIRMS), active power, and VAR during a tampering incident.
Features
- 7 high-performance ADCs
- 101dB signal-to-noise ratio (SNR)
10,000:1 dynamic range - Wide input range: ±1V, 0.707Vrms full scale
- Differential inputs
- 101dB signal-to-noise ratio (SNR)
- ±25ppm/°C maximum channel temperature drift (including ADC, internal VREF, and PGA drift), enabling Class 0.2 meters with standard external components
- Power quality measurements
- Line frequency: 1 measurement per phase
Zero crossing detection, zero-crossing timeout - Phase angle measurements
- Line frequency: 1 measurement per phase
- Supports CTs and Rogowski Coil (di/dt) sensors
- Multiple range phase/gain compensation for CTs
- Digital integrator for Rogowski coils
- High-speed communication port
- 10MHz serial peripheral interface (SPI)
- Flexible waveform buffer
- Able to re-sample waveform to ensure 64 points per line cycle for ease of external harmonic analysis
- Events can trigger waveform storage
- Simplifies data collection for IEC 61000-4-7 harmonic analysis
- Advanced metrology feature set
- Total active power, volt-amperes reactive (VAR), volt-amperes (VA), watthour, VAR-hour, and VA-hour
- Fundamental VAR and VAR-hour
- Current and voltage RMS per phase (xIRMS, xVRMS)
- Supports active energy standards: IEC 62053-21, IEC 62053-22; EN50470-3; OIML R46, ANSI C12.20
- Supports reactive energy standards: IEC 62053-23, IEC 62053-4
Applications
- Polyphase meters
- Power quality monitoring
- Protective devices
Videos
Block Diagram
Evaluation Tool
Analog Devices Inc. EVAL-ADE9078EBZ Evaluation Board
Evaluates the ADE9078 in a context very close to an actual 3-phase meter implementation.
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