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參數(shù)資料
| 型號： | EVAL-ADE7757EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Integrated Oscillator |
| 中文描述： | 電能計量IC集成振蕩器 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 534K |
| 代理商： | EVAL-ADE7757EB |
REV. PrC.
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
a
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.
ADE7757*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, USA.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., February 2002
Energy Metering IC
with Integrated Oscillator
FEATURES
On Chip Oscillator as clock source
High Accuracy, Supports 50 Hz/60 Hz IEC 521/1036
Less than 0.1% Error Over a Dynamic Range of
500 to 1
The ADE7757 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
Direct Drive for Electromechanical Counters and
Two Phase Stepper Motors (F1 and F2)
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
AC Input only
GENERAL DESCRIPTION
The ADE7757 is a high accuracy electrical energy mea-
surement IC. It is a pin reduction version of AD7755
with an enhancement of a precise oscillator circuit that
serves as a clock source to the chip. The ADE7757
eliminates the cost of an external crystal or resonator,
thus reducing the overall cost of a meter built with this
IC. The chip directly interfaces with shunt resistor and
only operates with AC input.
*U.S. Patents 5,745,323, 5,760,617, 5,862,069, 5,872,469; other pending.
FUNCTIONAL BLOCK DIAGRAM
V
DD
AGND
The ADE7757 specifications surpass the accuracy require-
ments as quoted in the IEC1036 standard. Due to the
similarity between the ADE7757 and AD7755, the Appli-
cation Note AN-559 can be used as a basis for a descrip-
tion of an IEC1036 low cost watt-hour meter reference
design.
The only analog circuitry used in the ADE7757 is in the
sigma-delta ADCs and reference circuit. All other signal
processing (e.g., multiplication and filtering) is carried
out in the digital domain. This approach provides superior
stability and accuracy over time and extreme environmen-
tal conditions.
The ADE7757 supplies average real power information on
the low frequency outputs F1 and F2. These outputs may
be used to directly drive an electromechanical counter or
interface with an MCU. The high frequency CF logic
output, ideal for calibration purposes, provides instanta-
neous real power information.
The ADE7757 includes a power supply monitoring circuit
on the V
DD
supply pin. The ADE7757 will remain in reset
mode until the supply voltage on V
DD
reaches approxi-
mately 4 V. If the supply falls below 4 V, the ADE7757
will also reset and the F1, F2 and CF outputs will be in
their non-active modes.
Internal phase matching circuitry ensures that the voltage
and current channels are phase matched while the HPF in
the current channel eliminates dc offsets. An internal no-
load threshold ensures that the ADE7757 does not exhibit
creep when no load is present.
The ADE7757 is available in 16-lead SOIC narrow-body
package.
MULTIPLIER
RESERVED
V2P
V2N
V1P
HPF
RCLKIN
REF
IN/OUT
F1
F2
CF
SCF
S0
S1
PHASE
CORRECTION
4kV
...
110101
...
SIGNAL
PROCESSING
BLOCK
ADC
POWER
SUPPLY MONITOR
ADC
V1N
ADE7757
...
11011001
...
LPF
2.5V
REFERENCE
DIGITAL-TO-FREQUENCY
CONVERTER
DGND
∑
∑
INTERNAL
OSCILLATOR
Φ
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