ADE7763_13 Datasheet, PDF (1/56 Pages) Analog Devices – Single-Phase Active and Apparent Energy Metering IC

Data Sheet
Single-Phase Active and Apparent
Energy Metering IC
ADE7763
FEATURES
perform active and apparent energy measurements, line-voltage
High accuracy; supports IEC 61036/60687, IEC62053-21, and
IEC62053-22
On-chip digital integrator enables direct interface-to-current
sensors with di/dt output
A PGA in the current channel allows direct interface to
shunts and current transformers
period measurements, and rms calculation on the voltage and
current channels. The selectable on-chip digital integrator
provides direct interface to di/dt current sensors such as
Rogowski coils, eliminating the need for an external analog
integrator and resulting in excellent long-term stability and precise
phase matching between the current and the voltage channels.
Active and apparent energy, sampled waveform, and current
The ADE7763 provides a serial interface to read data and a
and voltage rms
pulse output frequency (CF) that is proportional to the active
Less than 0.1% error in active energy measurement over a
power. Various system calibration features such as channel
dynamic range of 1000 to 1 at 25°C
offset correction, phase calibration, and power calibration
Positive-only energy accumulation mode available
On-chip user programmable threshold for line voltage surge
ensure high accuracy. The part also detects short duration, low
or high voltage variations.
and SAG and PSU supervisory
Digital calibration for power, phase, and input offset
On-chip temperature sensor (±3°C typical)
SPI®-compatible serial interface
Pulse output with programmable frequency
Interrupt request pin (IRQ) and status register
Reference 2.4 V with external overdrive capability
Single 5 V supply, low power (25 mW typical)
GENERAL DESCRIPTION
The ADE7763¹ features proprietary ADCs and fixed function DSP
The positive-only accumulation mode gives the option to
accumulate energy only when positive power is detected. An
internal no-load threshold ensures that the part does not exhibit
any creep when there is no load. The zero-crossing output (ZX)
produces a pulse that is synchronized to the zero-crossing point
of the line voltage. This signal is used internally in the line cycle
active and apparent energy accumulation modes, which enables
faster calibration.
The interrupt status register indicates the nature of the interrupt,
and the interrupt enable register controls which event produces
for high accuracy over large variations in environmental conditions
and time. The ADE7763 incorporates two second-order, 16-bit
Σ-∆ ADCs, a digital integrator (on Ch1), reference circuitry, a
an output on the IRQ pin, an open-drain, active low logic output.
The ADE7763 is available in a 20-lead SSOP package.
temperature sensor, and all the signal processing required to
FUNCTIONAL BLOCK DIAGRAM
AVDD
RESET
DVDD DGND
PGA
V1P
ADC
V1N
TEMP
SENSOR
INTEGRATOR
MULTIPLIER
dt
LPF2
WGAIN[11:0]
HPF1
IRMSOS[11:0]
LPF3
x²
APOS[15:0]
VAGAIN[11:0]
ADE7763
CFNUM[11:0]
DFC
CF
PGA
V2P
V2N
ADC
Φ
PHCAL[5:0] LPF1
VRMSOS[11:0]
|x|
LPF3
CFDEN[11:0]
VADIV[7:0]
%%
WDIV[7:0]
ZX
2.4V
4kΩ
REFERENCE
REGISTERS AND
SERIAL INTERFACE
SAG
AGND
REF_IN/OUT
CLKIN CLKOUT
DIN DOUT SCLK CS IRQ
Figure 1.
1 _{U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469.}
Rev. C
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