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參數(shù)資料
| 型號： | AD7755 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Pulse Output(帶脈沖輸出的高精度電子能量測量芯片) |
| 中文描述： | 電能計量IC脈沖輸出（帶脈沖輸出的高精度電子能量測量芯片） |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 260K |
| 代理商： | AD7755 |
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
PRELIM B2 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 pulse output
AD7755*
FEATURES
High Accuracy, supports 50/60 Hz IEC 521/1036
Less than 0.3% error over a dynamic range of 500 to 1
The AD7755 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
The Logic output REVP can be used to
indicate a potential mis-wiring or negative power
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
User selectable timed reset of AD7755 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 AD7755 is a high accuracy electrical energy measurement
IC which is intended for use with two-wire distribution
systems. The part specifications surpass the accuracy require-
ments as quoted in the IEC1036 standard.
MULTIPLIER
DVDD
HPF
LPF
DGND
Signal
Processing
Block
PHASE
CORRECTION
Φ
CLKOUT
V1P
V1N
G0
+
-
+
-
V2P
V2N
2.5V
REFERENCE
ADC
x1, x2, x8, x16
G1
AVDD
DIGITAL TO FREQUENCY
CONVERTER
PGA
CLKIN
REFIN/OUT
F1
F2
CF
REVP
SCF
S0
S1
RESET
AGND
4k
....11011001....
...110101...
ADC
AD/DC
The only analog circuitry used in the AD7755 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 AD7755 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 AD7755 ensures correct operation on initial power up and
at power down. The reset functions by holding the AD7755 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 AD7755 is fabricated on 0.6μm CMOS technology; a
process that combines low power and low cost. The AD7755 is
available in 24 Lead DIP and SSOP packages.
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