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參數(shù)資料
| 型號(hào)： | AD7751 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with On-Chip Fault Detection(高精度容錯(cuò)電子能量測(cè)量芯片) |
| 中文描述： | 電能計(jì)量IC片故障檢測(cè)（高精度容錯(cuò)電子能量測(cè)量芯片） |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 287K |
| 代理商： | AD7751 |
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One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
PRELIM B1 10/98
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
*Patents Pending.
a
Preliminary Technical Data
Energy Metering IC
with On-Chip Fault Detection
AD7751*
FEATURES
High Accuracy, supports 50/60 Hz IEC 521/1036
Less than 0.3% error over a dynamic range of 500 to 1
The AD7751 supplies average real power on the
frequency outputs F1 and F2
The high frequency output CF is intended for
calibration and supplies instantaneous real power data
Continuous monitoring of the Phase and Neutral current
allows fault detection in two-wire distribution systems
The AD7751 uses the larger of the two currents
(Phase or Neutral) to bill—even during a fault condition
Two Logic outputs (FAULT & REVP) can be used to
indicate a potential mis-wiring or fault condition
Direct drive for electromechanical counters and
two 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
Automatic timed reset of AD7751 on power up/down
On-Chip reference 2.5V±8% (55 ppm/°C typical)
with external overdrive capability
Single 5V Supply, Low power (15mW typical)
Low Cost CMOS Process
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD7751 is high accuracy fault tolerant electrical energy
measurement IC which is intended for use with two-wire
distribution systems. The part specifications surpass the
accuracy requirements as quoted in the IEC1036 standard.
The only analog circuitry used on the AD7751 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 AD7751 incorporates a novel fault detection scheme which
both warns of fault conditions and allows the AD7751 to
continue accurate billing during a fault event. The AD7751
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% and billing is continued
using the larger of the two currents.
The AD7751 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.
An automatic timed (controlled by an external RC) reset pin on
the AD7751 ensures correct operation on initial power up and
at power down. The reset functions by holding the AD7751 in
a reset state until the power supply has settled.
Internal phase matching circuitry ensures that the voltage and
current channels are matched whether the HPF in channel 1 is
on or off.
The AD7751 is fabricated on 0.6μm CMOS technology; a
process that combines low power and low cost. The AD7751 is
available in 24 Lead DIP and SSOP packages.
MULTIPLIER
AC/DC
CLKOUT
V1A
V1B
ADC
V1N
G0
+
-
+
-
V2P
V2N
2.5V
REFERENCE
ADC
PGA
x1, x2, x8, x16
G1
AVDD
DVDD
FAULT
ADC
+
-
HPF
LPF
A
B
A>B
B>A
A<>B
DIGITAL TO FREQUENCY
CONVERTER
PGA
CLKIN
REFIN/OUT
F1
F2
CF
REVP
SCF
S0
S1
RESET
AGND
DGND
Signal
Processing
Block
PHASE
CORRECTION
Φ
4k
....11011001....
...110101...
...110101...
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7751AAN | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
| AD7751AAN-REF | 制造商:Analog Devices 功能描述: |
| AD7751AARS | 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
| AD7751ABRS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC With On-Chip Fault Detection |
| AD7751AN | 制造商:Rochester Electronics LLC 功能描述:PRODUCT TO FREQUENCY CONV - Bulk |
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