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ADE7751AN 데이터시트 PDF




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부품번호 ADE7751AN 기능
기능 Energy Metering IC with On-Chip Fault Detection
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ADE7751AN 데이터시트, 핀배열, 회로
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




ADE7751AN pdf, 반도체, 판매, 대치품
ADE7751
ABSOLUTE MAXIMUM RATINGS*
(TA = 25°C, unless otherwise noted.)
AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
DVDD to AVDD . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
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 + 0.3 V
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
Model
Package Description
Package
Option
ADE7751AN
ADE7751ARS
ADE7751ARSRL
Plastic DIP
Shrink Small Outline Package
Shrink Small Outline Package
in Reel
N-24
RS-24
RSRL-24
EVAL-ADE7751EB ADE7751 Evaluation Board
ADE7751AAN-REF ADE7751 Reference Design
PCB (See AN-563)
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V 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.
WARNING!
ESD SENSITIVE DEVICE
–4– REV. 0

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ADE7751AN 전자부품, 판매, 대치품
Typical Performance Characteristics–ADE7751
0.50
0.40
0.30
0.20
PF = 1
GAIN = 1
ON-CHIP REFERENCE
+85؇C
0.10
–40؇C
0.00
–0.10
–0.20
+25؇C
–0.30
–0.40
–0.50
0.01
0.10 1.00 10.0
AMPS
100
TPC 1. Error as a % of Reading (Gain = 1)
0.60
0.40
PF = 1
GAIN = 16
ON-CHIP REFERENCE
+85؇C PF = 1
0.20
0.00
+25؇C PF = 1
–0.20
–0.40
–0.60
–40؇C PF = 1
–0.80
0.01
0.1
1
AMPS
10
100
TPC 4. Error as a % of Reading (Gain = 16)
0.25
0.20
PF = 1
GAIN = 2
ON-CHIP REFERENCE
0.15
+85؇C
0.10
0.05
–40؇C
+25؇C
0.00
–0.05
0.01
0.1
1
AMPS
10
100
TPC 2. Error as a % of Reading (Gain = 2)
0.40
PF = 0.5
GAIN = 1
0.30 ON-CHIP REFERENCE
0.20
0.10
0.00
+25؇C PF = 0.5
–40؇C PF = 0.5
–0.10
–0.20
+85؇C PF = 0.5
+25؇C PF = 1
–0.30
0.01
0.1
1
AMPS
10
100
TPC 5. Error as a % of Reading (PF = 0.5, Gain = 1)
0.20
0.15
0.10
+85؇C
0.05
0.00
+25؇C
–0.05
–0.10 PF = 1
GAIN = 8
–0.15 ON-CHIP REFERENCE
0.01
0.1
1
AMPS
–40؇C
10 100
TPC 3. Error as a % of Reading (Gain = 8)
0.30
PF = 0.5
GAIN = 2
ON-CHIP REFERENCE
0.20
+85؇C PF = 0.5
0.10
0.00
+25؇C PF = 1
–0.10
–0.20
–40؇C PF = 0.5
+25؇C PF = 0.5
–0.30
0.01
0.1
1
AMPS
10
100
TPC 6. Error as a % of Reading (Gain = 2)
REV. 0
–7–

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