ADE7752B Datasheet, PDF (1/27 Pages) Analog Devices – Polyphase Energy Metering IC with Pulsed Output

Polyphase Energy Metering IC with Pulsed
Output
Preliminary Technical Data
ADE7752B
FEATURES
High accuracy supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Compatible with 3-phase 3-wire delta and 3-phase 4-wire Wye
configurations
Supplies average active power on the frequency outputs F1 and F2
High frequency output (CF) is intended for calibration and
supplies instantaneous active power
Logic output REVP indicates a potential miswiring or negative
power on the sum of all phases
Direct drive for electromechanical counters and 2-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) based on the sum
of the three phases
On-chip reference 2.4 V ± 8% (25 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (TBD mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE7752B¹ is an accurate active energy measurement IC
intended for use in any 3-phase distribution system and has
enhanced features that make it better suited for 3-phase 3-wire
applications compared to the ADE7752/52A.
The no-load threshold and reverse polarity indication are based
on the sum of the three phase energies in the ADE7752B. The
ADE7752B specifications surpass the accuracy requirements as
quoted in the IEC62053-21 standard.
The only analog circuitry used in the ADE7752B is in the
analog-to-digital converters (ADCs) and reference circuit. All
other signal processing (for example, multiplication, filtering,
and summation) is carried out in the digital domain. This
approach provides superior stability and accuracy over
extremes in environmental conditions and over time.
The ADE7752B supplies average active power information on
the low frequency outputs, F1 and F2. These logic outputs can
be used to directly drive an electromechanical counter or to
interface with an MCU. The CF logic output gives
instantaneous active power information. This output is
intended to be used for calibration purposes.
The ADE7752B includes a power supply monitoring circuit on
the VDD pin. The ADE7752B remains inactive until the supply
voltage on VDD reaches 4 V. If the supply falls below 4 V, the
ADE7752B also resets and no pulses are issued on F1, F2, and CF.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched. An internal no load
threshold ensures the ADE7752B does not exhibit any creep
when there is no load.
The ADE7752B is available in a 24-lead SOIC package.
1 _{Patent pending.}
FUNCTIONAL BLOCK DIAGRAM
ABS
V_DD
17
3
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP ¹⁵
ADC
ADC
ADC
ADC
ICP 9
ICN 10
VCP 14
VN 13
ADC
ADC
4kΩ
2.4V REF
HPF
Φ
PHASE
CORRECTION
HPF
Φ
PHASE
CORRECTION
HPF
Φ
PHASE
CORRECTION
X
LPF
POWER
SUPPLY
MONITOR
ADE7752B
X
Σ
LPF
2 DGND
19 _CLKIN
20 CLKOUT
X
LPF
DIGITAL-TO-FREQUENCY CONVERTER
11
12
4
18
21 22
23
24
1
AGND
REF_IN/OUT
REVP SCF S0 S1 F2 F1 CF
Figure 1.
Rev. PrA
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