Poly Phase Multifunction Energy Metering IC
with Per Phase Information

ADE7758


Rev. A
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FEATURES
High accuracy, supports IEC 60687, IEC 61036, IEC 61268,
IEC 62053-21, IEC 62053-22, and IEC 62053-23
Compatible with 3-phase/3-wire, 3-phase/4-wire, and other
3-phase services
Less than 0.1% active energy error over a dynamic range of
1000 to 1 at 25°C
Supplies active/reactive/apparent energy, voltage rms,
current rms, and sampled waveform data
Two pulse outputs, one for active power and the other
selectable between reactive and apparent power with
programmable frequency
Digital power, phase, and rms offset calibration
On-chip user programmable thresholds for line voltage SAG
and overvoltage detections
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
A SPI® compatible serial interface with IRQ
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time

Reference 2.4 V (drift 30 ppm/°C typ) with external
overdrive capability
Single 5 V supply, low power (70 mW typ)
GENERAL DESCRIPTION
The ADE7758
1
is a high accuracy 3-phase electrical energy
measurement IC with a serial interface and two pulse outputs.
The ADE7758 incorporates second-order ∑-∆ ADCs, a digital
integrator, reference circuitry, temperature sensor, and all the
signal processing required to perform active, reactive, and
apparent energy measurement and rms calculations.
The ADE7758 is suitable to measure active, reactive, and
apparent energy in various 3-phase configurations, such as
WYE or DELTA services, both with three or four wires. The
ADE7758 provides system calibration features for each phase,
i.e., rms offset correction, phase calibration, and power
calibration. The APCF logic output gives active power
information, and the VARCF logic output provides
instantaneous reactive or apparent power information.
(Continued on Page 4)
FUNCTIONAL BLOCK DIAGRAM
04443-
0-
001
PHASE B
AND
PHASE C
DATA
4
AVDD
POWER
SUPPLY
MONITOR
12
REF
IN/OUT
11
AGND
ADC
–
+9ICP
10ICN
PGA1
ADC
–
+14VCP
13VN
PGA2
ACTIVE/REACTIVE/APPARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCULATION
FOR PHASE C
(SEE PHASE A FOR DETAILED SIGNAL PATH)
ADC
–
+7IBP
8IBN
PGA1
ADC
–
+15VBP
PGA2
ACTIVE/REACTIVE/APPARENT ENERGIES
AND VOLTAGE/CURRENT RMS CALCULATION
FOR PHASE B
(SEE PHASE A FOR DETAILED SIGNAL PATH)
ADC
–
+5IAP
6IAN
PGA1
ADC
–
+16VAP
PGA2
AIGAIN[11:0]
AVRMSGAIN[11:0]
AVAG[11:0]
X
2
APHCAL[6:0]
Φ
HPF INTEGRATOR
dt
AVAROS[11:0] AVARG[11:0]
LPF2
90° PHASE
SHIFTING FILTER
π
2
AWATTOS[11:0] AWG[11:0]
LPF2
22
DIN
24
DOUT
23
SCLK
21
CS
18
IRQ
ADE7758 REGISTERS AND
SERIAL INTERFACE
WDIV[7:0] %
VARDIV[7:0] %
VADIV[7:0] %
AIRMSOS[11:0]
X
2
LPF
2.4V
REF
4kΩ
DFC ÷
APCFNUM[11:0]
APCFDEN[11:0]
ACTIVE POWER
1 APCF
3 DVDD
2 DGND
19 CLKIN
20 CLKOUT
DFC
VARCFNUM[11:0]
VARCFDEN[11:0]
REACTIVE OR
APPARENT POWER
17 VARCF
ADE7758
÷
AVRMSOS[11:0]

1
Patents Pending.
Figure 1.