High Performance, Polyphase
Energy Metering AFE
Data Sheet
ADE9078
FEATURES
FUNCTIONAL BLOCK DIAGRAM
7 high performance analog-to-digital converters (ADCs)
101 dB signal-to-noise ratio (SNR)
10,000:1 dynamic range
LDO
ADE9078
PGA
ADC
METROLOGY FEATURES
Wide input range: 1 V, 0.707 V rms full scale
Differential inputs
25 ppm/°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
Supports current transformers (CTs) and Rogowski coil
(di/dt) sensors
PGA
PGA
PGA
PGA
PGA
PGA
CF1
TO CF4
ADC
ADC
ADC
ADC
ADC
ADC
(PER PHASE)
IRMS, VRMS
ACTIVE POWER, VA
WATTHOUR, VA-Hr
WAVEFORM BUFFER
LINE FREQUENCY
ETC.
SINC4
AND
DECIMATION
IRQ0
IRQ1
SPI
1.25V
REFERENCE
Figure 1.
Multiple range phase/gain compensation for CTs
Digital integrator for Rogowski coils
Flexible waveform buffer
Able to resample 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
The ADE9078 integrates seven high performances ADCs and a
flexible DSP core. An integrated high end reference ensures low
drift over temperature with a combined drift of less than
25 ppm/°C maximum per channel, each of which includes a
programmable gain amplifier (PGA) and ADC.
The ADE9078 offers an integrated flexible waveform buffer that
stores samples at a fixed data rate or a sampling rate that varies
based on line frequency to ensure 64 points per line cycle. These
two options make it easy to implement harmonic analysis in an
external processor according to IEC 61000-4-7.
High speed communication port
10 MHz serial peripheral interface (SPI)
APPLICATIONS
Polyphase meters
Two power modes are provided to enable detection of meter
tampering: PSM2 uses a low power comparator to compare
current channels to a threshold and indicates whether it is
Power quality monitoring
Protective device
GENERAL DESCRIPTION
IRQ0
IRQ1
exceeded on the
and
outputs; PSM1 enables fast
The ADE90781 is a highly accurate, fully integrated energy
metering device. Interfacing with both current transformer
(CT) and Rogowski coil sensors, the ADE9078 enables users to
develop a 3-phase metrology platform, which achieves high
performance for Class 1 up to Class 0.2 meters.
measurement of current and voltage rms (xVRMS and xIRMS),
active power, and VAR during a tamper.
The ADE9078 allows advanced and highly accurate energy
measurements, enabling one platform to cover a wide range of
meters, through a combination of various high end metrology
features and superior analog performance.
1 Protected by U.S. Patents 5,952,849; 6,873,065; 7,075,329; 6,262,600; 7,489,526; 7,558,080. Other patents are pending.
Rev. 0 Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
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