Analog Devices ADE7753 - Manual

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REV. PrC 1/02

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Active and Apparent Energy Metering IC

with di/dt sensor interface

ADE7753*

FEATURES
High Accuracy, supports IEC 61036 and IEC61268
On-Chip Digital Integrator enables direct interface with

current sensors with di/dt output

The ADE7753 supplies Active, Reactive and Apparent

Energy, Sampled Waveform, Current and Voltage RMS

Less than 0.1% error over a dynamic range of 1000 to 1
Positive only energy accumulation mode available
An On-Chip user Programmable threshold for line

voltage surge and SAG, and PSU supervisory

Digital Power, Phase & Input Offset Calibration
An On-Chip temperature sensor (±3°C typical)
A SPI compatible Serial Interface
A pulse output with programmable frequency
An Interrupt Request pin (IRQ) and Status register
Proprietary ADCs and DSP provide high accuracy data over

large variations in environmental conditions and time

Reference 2.4V±8% (20 ppm/°C typical)

with external overdrive capability

Single 5V Supply, Low power (25mW typical)

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

*U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others Pending.

precise phase matching between the current and voltage
channels. The integrator can be switched on and off based on
the current sensor selected.
The ADE7753 contains an Active Energy register, an Appar-
ent Energy register capable of holding at least TBD seconds
of accumulated power at full load and rms calculation for
both inputs. Data is read from the ADE7753 via the serial
interface. The ADE7753 also provides a pulse output (CF)
with output frequency is proportional to the active power.
In addition to rms calculation and active and apparent power
i n f o r m a t i o n , t h e A D E 7 7 5 3 a l s o a c c u m u l a t e s t h e s i g n e d
reactive energy. The ADE7753 also provides various system
calibration features, i.e., channel offset correction, phase
calibration and power calibration. The part also incorporates
a detection circuit for short duration low or high voltage
v a r i a t i o n s .
The ADE7753 has a positive only accumulation mode which
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.
A zero crossing output (ZX) produces an output which is
synchronized to the zero crossing point of the line voltage.
This information is used in the ADE7753 to measure the
line's period. The signal is also used internally to the chip in
the line cycle Active and Apparent energy accumulation
mode. This enables a faster and more precise energy accumu-
lation and is useful during calibration. This signal is also
useful for synchronization of relay switching with a voltage
zero crossing.
The interrupt request output is an open drain, active low logic
output. The Interrupt Status Register indicates the nature of
the interrupt, and the Interrupt Enable Register controls
which event produces an output on the

IRQ

pin.

The ADE7753 is available in 20-lead SSOP package.

:

DVDD

HPF

LPF2

DGND

CLKOUT

V1P

V1N

+

-

+

-

V2P

V2N

2.4V

REFERENCE

ADC

AVDD

PGA

CLKIN

REF IN/OUT

CF

RESET

AGND

4k

Ω

Φ

PHCAL[5:0]

MULTIPLIER

Σ

APOS[15:0]

DIN DOUT SCLK CS

SAG

ZX

IRQ

ADE7753 REGISTERS &

SERIAL INTERFACE

ADE7753

TEMP

SENSOR

LPF1

INTEGRATOR

冮

dt

VRMSOS[11:0]

IRMSOS[11:0]

Σ

Σ

WGAIN[11:0]

WDIV[7:0]

CFNUM[11:0]

CFDEN[11:0]

DFC

VAGAIN[11:0]

VADIV[7:0]

:

PGA

ADC

PRELIMINARY TECHNICAL DATA

Preliminary Technical Data

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

GENERAL DESCRIPTION

The ADE7753 is an accurate active and apparent energy
measurements IC with a serial interface and a pulse output.
The ADE7753 incorporates two second order sigma delta
ADCs, a digital integrator (on CH1), reference circuitry,
temperature sensor, and all the signal processing required to
perform RMS calculation on the voltage and current, active,
reactive, and apparent energy measurement.

An on-chip digital integrator provides direct interface to di/
d t c u r r e n t s e n s o r s s u c h a s R o g o w s k i c o i l s . T h e d i g i t a l
integrator eliminates the need for external analog integrator,
and this solution provides excellent long-term stability and