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ADE7751ARS
Energy Metering IC with On-Chip Fault Detection
Energy Metering IC
with On-Chip Fault Detection
FEATURES
High Accuracy, Surpasses 50 Hz/60 Hz IEC 687/1036
Less than 0.1% Error over a Dynamic Range of 500 to 1
Supplies Average Real Power on the Frequency
Outputs F1 and F2
High-Frequency Output CF Is Intended for Calibration
and Supplies Instantaneous Real Power
Continuous Monitoring of the Phase and Neutral
Current Allows Fault Detection in 2-Wire
Distribution Systems
ADE7751 Uses the Larger of the Two Currents (Phase
or Neutral) to Bill—Even During a Fault Condition
Two Logic Outputs (FAULT and REVP) Can Be Used to
Indicate a Potential Miswiring or Fault Condition
Direct Drive for Electromechanical Counters and
2-Phase Stepper Motors (F1 and F2)
A PGA in the Current Channel Allows the Use of Small
Values of Shunt and Burden Resistance
Proprietary ADCs and DSP Provide High Accuracy over
Large Variations in Environmental Conditions and Time
On-Chip Power Supply Monitoring
On-Chip Creep Protection (No Load Threshold)
On-Chip Reference 2.5 V � 8% (30 ppm/�C Typical)
with External Overdrive Capability
Single 5 V Supply, Low Power (15 mW Typical)
Low-Cost CMOS Process
FUNCTIONAL BLOCK DIAGRAM*US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469.
The only analog circuitry used in the ADE7751 is in the ADCs
and reference circuit. All other signal processing (e.g., multipli-
cation and filtering) is carried out in the digital domain. This
approach provides superior stability and accuracy over extremes
in environmental conditions and over time.
The ADE7751 incorporates a novel fault detection scheme that
warns of fault conditions and allows the ADE7751 to continue
accurate billing during a fault event. The ADE7751 does this
by continuously monitoring both the phase and neutral (return)
currents. A fault is indicated when these currents differ by more
than 12.5%. Billing is continued using the larger of the two currents.
The ADE7751 supplies average real power information on the
low-frequency outputs F1 and F2. These logic outputs may be
used to directly drive an electromechanical counter or interface
to an MCU. The CF logic output gives instantaneous real power
information. This output is intended to be used for calibration purposes.
The ADE7751 includes a power supply monitoring circuit on the
AVDD supply pin. The ADE7751 will remain in a reset condition
until the supply voltage on AVDD reaches 4 V. If the supply falls
below 4 V, the ADE7751 will also be reset and no pulses will be
issued on F1, F2, and CF.
Internal phase matching circuitry ensures that the voltage and
current channels are matched whether the HPF in Channel 1 is
on or off. The ADE7751 also has anticreep protection.
The ADE7751 is available in 24-lead DIP and SSOP packages.
GENERAL DESCRIPTIONThe ADE7751 is a high-accuracy, fault-tolerant electrical energy
measurement IC that is intended for use with 2-wire distribution
systems. The part specifications surpass the accuracy require-
ments as quoted in the IEC1036 standard.
ADE7751–SPECIFICATIONS1, 2(AVDD = DVDD = 5 V � 5%, AGND = DGND = 0 V, On-Chip Reference,
CLKIN = 3.58MHz, TMIN to TMAX = –40�C to +85�C.)FAULT DETECTION
CLKIN
ADE7751POWER SUPPLY
NOTESSee Terminology section for explanation of specifications.See plots in Typical Performance Characteristics graphs.See Fault Detection section of data sheet for explanation of fault detection functionality.Sample tested during initial release and after any redesign or process change that may affect this parameter.
Specifications subject to change without notice.
TIMING CHARACTERISTICS1, 2NOTESSample tested during initial release and after any redesign or process change that may affect this parameter.See Figure 1.The pulsewidths of F1, F2, and CF are not fixed for higher output frequencies. See Frequency Outputs F1 and F2 section.
Specifications subject to change without notice.
Figure 1.Timing Diagram for Frequency Outputs
(AVDD = DVDD = 5 V � 5%, AGND = DGND = 0 V, On-Chip Reference, CLKIN = 3.58 MHz,
TMIN to TMAX = –40�C to +85�C.)
ADE7751
ABSOLUTE MAXIMUM RATINGS*(TA = 25°C, unless otherwise noted.)
AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
DVDD to AVDD . . . . . . . . . . . . . . . . . . . . . . –0.3V to +0.3V
Analog Input Voltage to AGND
V1A, V1B, V1N, V2P, and V2N . . . . . . . . . . –6 V to +6 V
Reference Input Voltage to AGND . .–0.3 V to AVDD + 0.3V
Digital Input Voltage to DGND . . . .–0.3 V to DVDD + 0.3 V
Digital Output Voltage to DGND . . .–0.3 V to DVDD + 0.3 V
Operating Temperature Range
Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
24-Lead Plastic DIP, Power Dissipation . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 105°C/W
Lead Temperature, (Soldering 10 sec) . . . . . . . . . . . 260°C
24-Lead SSOP, Power Dissipation . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 112°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect device reliability.
ORDERING GUIDE
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADE7751 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
PIN CONFIGURATION
PIN FUNCTION DESCRIPTIONS3AVDD
ADE775123, 24
PIN FUNCTION DESCRIPTIONS (continued)
TERMINOLOGY
ADC Offset ErrorThis refers to the dc offset associated with the analog inputs to
the ADCs. It means that with the analog inputs connected to
AGND the ADCs still see an analog input signal of 1 mV to
10 mV. However, when the HPF is switched on, the offset is
removed from the current channel and the power calculation is
not affected by this offset.
Gain ErrorThe gain error of the ADE7751 is defined as the difference between
the measured output frequency (minus the offset) and the ideal
output frequency. It is measured with a gain of 1 in Channel
V1A. The difference is expressed as a percentage of the ideal
frequency. The ideal frequency is obtained from the transfer
function—see Transfer Function section.
Gain Error MatchThe gain error match is defined as the gain error (minus the
offset) obtained when switching between a gain of 1 and a gain
of 2, 8, or 16. It is expressed as a percentage of the output
frequency obtained under a gain of 1. This gives the gain
error observed when the gain selection is changed from
1 to 2, 8, or 16.
Measurement ErrorThe error associated with the energy measurement made by the
ADE7751 is defined by the following formula:
Percentage Error =
Phase Error Between ChannelsThe HPF (high-pass filter) in Channel 1 has a phase lead
response. To offset this phase response and equalize the phase
response between channels, a phase correction network is also
placed in Channel 1. The phase correction network matches the
phase to within ±0.1° over a range of 45 Hz to 65 Hz and ±0.2°
over a range 40 Hz to 1 kHz (see Figures 10 and 11).
Power Supply RejectionThis quantifies the ADE7751 measurement error as a percent-
age of reading when the power supplies are varied.
For the ac PSR measurement, a reading at nominal supplies
(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced
onto the supplies and a second reading is obtained under the
same input signal levels. Any error introduced is expressed as a
percentage of the reading—see Measurement Error definition.
AMPS
ERROR – %
0.50TPC 1.Error as a % of Reading (Gain = 1)
AMPS
ERROR – %
–0.05TPC 2.Error as a % of Reading (Gain = 2)
AMPS
ERROR – %
100TPC 3.Error as a % of Reading (Gain = 8)
TPC 4.Error as a % of Reading (Gain = 16)
TPC 5.Error as a % of Reading (PF = 0.5, Gain = 1)
TPC 6.Error as a % of Reading (Gain = 2)
ADE7751
AMPS
ERROR – %
–0.60TPC 7.Error as a % of Reading (PF = 0.5, Gain = 8)
AMPS
ERROR – %
0.00TPC 8.Error as a % of Reading (Gain = 16)
AMPS
ERROR – %
–0.30TPC 9.Error as a % of Reading over Temperature with
an External Reference (Gain = 2)
AMPS
ERROR – %
100TPC 10.Error as a % of Reading over Temperature with
an External Reference (Gain = 8)
AMPS
ERROR – %
100TPC 11.Error as a % of Reading over Temperature with
an External Reference (Gain = 16)
TPC 12.Channel 1 Offset Distribution (Gain = 1)
