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ADE7756ARSRL Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte ADE7756ARSRL
Spiegazioni elettronici  Active Energy Metering IC with Serial Interface
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADE7756ARSRL Scheda tecnica(HTML) 1 Page - Analog Devices

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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.
a
ADE7756*
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., 2001
Active Energy Metering IC
with Serial Interface
FUNCTIONAL BLOCK DIAGRAM
MULTIPLIER
DVDD
HPF1
LPF2
DGND
CLKOUT
V1P
V1N
V2P
V2N
2.4V
REFERENCE
ADC
AVDD
PGA
CLKIN
REFIN/OUT
CF
RESET
AGND
4k
PHCAL[5:0]
MULTIPLIER
APOS[11:0]
DFC
DIN DOUT SCLK CS
SAG
ZX
IRQ
ADE7756 REGISTERS
AND
SERIAL INTERFACE
ADE7756
TEMP
SENSOR
APGAIN[11:0]
CFDIV[11:0]
LPF1
ADC
FEATURES
High Accuracy, Supports IEC 687/1036
Less than 0.1% Error over a Dynamic Range of 1000 to 1
An On-Chip User Programmable Threshold for Line
Voltage SAG Detection and PSU Supervisory
The ADE7756 Supplies Sampled Waveform Data
(20 Bits) and Active Energy (40 Bits)
Digital Power, Phase and Input Offset Calibration
An On-Chip Temperature Sensor ( 3 C Typical after
Calibration)
An SPI-Compatible Serial Interface
A Pulse Output with Programmable Frequency
An Interrupt Request Pin (IRQ) and Status Register
Provide Early Warning of Register Overflow and
Other Conditions
Proprietary ADCs and DSP Provide High Accuracy
over Large Variations in Environmental Conditions
and Time
Reference 2.4 V
8% (20 ppm/ C Typical) with External
Overdrive Capability
Single 5 V Supply, Low Power (25 mW Typical)
*U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; other pending.
GENERAL DESCRIPTION
The ADE7756 is a high-accuracy electrical power measurement
IC with a serial interface and a pulse output. The ADE7756
incorporates two second-order sigma-delta ADCs, reference
circuitry, temperature sensor, and all the signal processing
required to perform active power and energy measurement.
The ADE7756 contains a sampled Waveform register and an
Active Energy register capable of holding at least five seconds of
accumulated power at full load. Data is read from the ADE7756
via the serial interface. The ADE7756 also provides a pulse output
(CF) with a frequency that is proportional to the active power.
In addition to real power information, the ADE7756 also provides
system calibration features, i.e., channel offset correction, phase
calibration, and power calibration. The part also incorporates a
detection circuit for short duration low voltage variations or sags.
The voltage threshold level and the duration (in number of half-
line cycles) of the variation are user programmable. An open drain
logic output (
SAG) goes active low when a sag event occurs.
A zero crossing output (ZX) produces an output that is synchro-
nized to the zero crossing point of the line voltage. This output can
be used to extract timing or frequency information from the line.
The signal is also used internally to the chip in the calibration
mode. This permits faster and more accurate calibration of the
real power calculation. This signal is also useful for synchronization
of relay switching with a voltage zero crossing, thus improving
the relay life by reducing the risk of arcing.
The interrupt request output is an open drain, active low logic
output. The
IRQ output will become active when the accumu-
lated real power register is half-full and also when the register
overflows. A status register indicates the nature of the interrupt.
The ADE7756 is available in 20-lead DIP and 20-lead
SSOP packages.


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