ADE7752 Analog Devices, ADE7752 Datasheet

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ADE7752

Manufacturer Part Number
ADE7752
Description
Three Phase Energy Metering IC with Pulse Output
Manufacturer
Analog Devices
Datasheet

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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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
*Patents pending
REV. PrB 08/01
VAP
VBP
VCP
IAN
IBN
ICN
IAP
IBP
ICP
VN
16
15
10
14
13
5
6
7
8
PRELIMINARY TECHNICAL DATA
AGND
REF
2.5V
11
4kΩ
ADC
ADC
ADC
ADC
ADC
ADC
REF
12
FUNCTIONAL BLOCK DIAGRAM
IN/OUT
CORRECTION
CORRECTION
CORRECTION
PHASE
PHASE
PHASE
HPF
HPF
HPF
Φ
Φ
Φ
REVP
The ADE7752 is a high accuracy three phase electrical
energy measurement IC. The part specifications surpass the
accuracy requirements as quoted in the IEC1036 standard.
The only analog circuitry used in the ADE7752 is in the
ADCs and reference circuit. All other signal processing (e.g.,
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 ADE7752 supplies average real power information on
the low frequency outputs F1 and F2. These logic outputs
may be used to directly drive an electromechanical counter or
interface with an MCU. The CF logic output gives instan-
taneous real power information. This output is intended to be
used for calibration purposes, or as interface with an MCU.
The ADE7752 includes a power supply monitoring circuit
on the AV
until the supply voltage on V
below 4 V, the ADE7752 will also be reset and no pulses will
be 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 that the ADE7752 does not exhibit any
creep when there is no load.
The ADE7752 is available in 24-lead SOIC packages.
4
LPF
LPF
LPF
SCF
DIGITAL-TO-FREQUENCY
18
CONVERTER
S0
RESET
DD
21
17
Σ
supply pin. The ADE7752 will remain inactive
S1
22
ADE7752
F2
23
Power
Supply
Monitor
VDD
F1
24
3
CF
1
DD
19
20
2
DGND
CLKIN
CLKOUT
reaches 4 V. If the supply falls

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ADE7752 Summary of contents

Page 1

... The ADE7752 includes a power supply monitoring circuit on the AV until the supply voltage on V below 4 V, the ADE7752 will also be reset and no pulses will be 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 that the ADE7752 does not exhibit any creep when there is no load ...

Page 2

PRELIMINARY TECHNICAL DATA Parameter 1, 2 ACCURACY 1 Measurement Error on Current Channel 1 Phase Error Between Channels (PF = 0.8 Capacitive) (PF = 0.5 Inductive Power Supply Rejection Output Frequency Variation (CF Power Supply Rejection ...

Page 3

... Output Pulse Period. See Transfer Function Section sec Time Between F1 Falling Edge and F2 Falling Edge ms CF Pulsewidth (Logic High) sec CF Pulse Period. See Transfer Function Section sec Minimum Time Between F1 and F2 Pulse Model ADE7752AR EVAL-ADE7752EB ADE7752 Evaluation 3 – ORDERING GUIDE Package Description Package Option SOIC Package R-24 Board ...

Page 4

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADE7752 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 5

... RESET Reset pin for the ADE7752. A logic low on this pin will hold the ADCs and digital circuitry (including the Serial Interface reset condition Select Calibration Frequency. This logic input is used to select the frequency on the calibration output CF ...

Page 6

... Master clock for ADCs and digital signal processing. An external clock can be pro- vided at this logic input. Alternatively, a parallel resonant AT crystal can be connected across CLKIN and CLKOUT to provide a clock source for the ADE7752. The clock frequency for specified operation is 10MHz. Ceramic load capacitors of between 22pF and 33pF should be used with the gate oscillator circuit ...

Page 7

... can be seen from Equation 7, in the ADE7752 the real power calculation per phase is made when current and voltage inputs of the one phase are connected to the same channel ( C). Then, the summation of each individual real power calculation gives the total Real Power information. P(t) = ...

Page 8

... Current channel input and Voltage channel input of the same phase are not in phase in normal operation. Example 3 In this example, the ADE7752 is connected to a 3-phase 3- wire delta service as shown in Figure 14. The total real energy calculation processed in the ADE7752 can be expressed as: ...

Page 9

... V . sin(2π/3) represents the RMS voltage between AN VAP and VN pins of the ADE7752 sin (π/3) represents the RMS voltage between BN VBP and VN pins of the ADE7752. As the LPF on each channel eliminates the 2ω the equation, the Real power measured by the ADE7752 is ⋅ ⋅ + ⋅ ...

Page 10

... The ADE7752 also includes a “no load threshold” and “start-up current” feature that will eliminate any creep effects in the meter. The ADE7752 is designed to issue a minimum output frequency. Any load generating a frequency lower than this minimum frequency will not cause a pulse to be issued on F1 ...

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