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ADE7751 Datasheet

Energy Metering IC with On-Chip Fault Detection

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a
Energy Metering IC
with On-Chip Fault Detection
ADE7751*
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
GENERAL DESCRIPTION
The 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.
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.
FUNCTIONAL BLOCK DIAGRAM
G0 G1
AVDD AGND
FAULT
AC/DC DVDD DGND
V1A
V1N
V1B
V2P
V2N
ADE7751
POWER
SUPPLY MONITOR
SIGNAL
A< >B
...110101... A
PROCESSING
BLOCK
ADC
HPF
PGA
A >B
؋1, ؋2, ؋8, ؋16
ADC
PGA
؋1, ؋2, ؋8, ؋16
...110101... B
B>A
PHASE
CORRECTION
MULTIPLIER
LPF
. . .11011001. . .
ADC
2.5V
4k
REFERENCE
DIGITAL-TO-FREQUENCY
CONVERTER
REFIN/OUT CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2 RESET
*US Patent 5,745,323; 5,760,617; 5,862,069; 5,872,469.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

ADE7751 Datasheet

Energy Metering IC with On-Chip Fault Detection

No Preview Available !

ADE7751–SPECIFICATIONS1, 2 (AVDD = DVDD = 5 V ؎ 5%, AGND = DGND = 0 V, On-Chip Reference,
CLKIN = 3.58 MHz, TMIN to TMAX = –40؇C to +85؇C.)
Parameter
ACCURACY3
Measurement Error1 on Channels 1 and 2
Gain = 1
Gain = 2
Gain = 8
Gain = 16
Phase Error1 between Channels
V1 Phase Lead 37°
(PF = 0.8 Capacitive)
V1 Phase Lag 60°
(PF = 0.5 Inductive)
AC Power Supply Rejection1
Output Frequency Variation (CF)
Value
0.1
0.1
0.1
0.1
± 0.1
± 0.1
0.2
DC Power Supply Rejection1
Output Frequency Variation (CF)
± 0.3
FAULT DETECTION1, 4
Fault Detection Threshold
Inactive i/p <> Active i/p
Input Swap Threshold
Inactive i/p > Active i/p
Accuracy Fault Mode Operation
V1A Active, V1B = AGND
V1B Active, V1A = AGND
Fault Detection Delay
Swap Delay
ANALOG INPUTS
Maximum Signal Levels
Input Impedance (DC)
Bandwidth
ADC Offset Error1
Gain Error1
Gain Error Match1
REFERENCE INPUT
REFIN/OUT Input Voltage Range
Input Impedance
Input Capacitance
ON-CHIP REFERENCE
Reference Error
Temperature Coefficient
CLKIN
Input Clock Frequency
LOGIC INPUTS4
SCF, S0, S1, AC/DC,
RESET, G0, and G1
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN
12.5
14
0.1
0.1
3
3
±1
390
14
± 25
± 10
± 0.4
2.7
2.3
3.2
10
± 200
± 30
4
1
2.4
0.8
±3
10
Unit
% Reading typ
% Reading typ
% Reading typ
% Reading typ
Degrees(°) max
Degrees(°) max
% Reading typ
% Reading typ
% typ
% of Active typ
% Reading typ
% Reading typ
Second typ
Second typ
V max
kmin
kHz typ
mV max
% Ideal typ
% Ideal typ
V max
V min
kmin
pF max
mV max
ppm/°C typ
MHz max
MHz min
Test Conditions/Comments
One Channel with Full-Scale Signal (±660 mV)
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
Line Frequency = 45 Hz to 55 Hz
AC/DC = 0 and AC/DC = 1
AC/DC = 0 and AC/DC = 1
AC/DC = 1, S0 = S1 = 1, G0 = G1 = 0
V1 = 100 mV rms, V2 = 100 mV rms @ 50 Hz
Ripple on AVDD of 200 mV rms @ 100 Hz
AC/DC = 1, S0 = S1 = 1, G0 = G1 = 0
V1 = 100 mV rms, V2 = 100 mV rms,
AVDD = DVDD = 5 V ± 250 mV
See Fault Detection Section
(V1A or V1B Active)
(V1A or V1B Active)
Over a Dynamic Range 500 to 1
Over a Dynamic Range 500 to 1
See Analog Inputs Section
V1A, V1B, V1N, V2N, and V2P to AGND
CLKIN = 3.58 MHz
CLKIN/256, CLKIN = 3.58 MHz
See Terminology and Typical Performance
Characteristics
External 2.5 V Reference, Gain = 1,
V1 = V2 = 660 mV dc
External 2.5 V Reference
2.5 V + 8%
2.5 V – 8%
Nominal 2.5 V
Note All Specifications for CLKIN of 3.58 MHz
V min
V max
µA max
pF max
DVDD = 5 V ± 5%
DVDD = 5 V ± 5%
Typically 10 nA, VIN = 0 V to DVDD
–2– REV. 0


Part Number ADE7751
Description Energy Metering IC with On-Chip Fault Detection
Maker Analog Devices
Total Page 16 Pages
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