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ADE7752AARZ Scheda tecnica(PDF) 6 Page - Analog Devices

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Spiegazioni elettronici  Polyphase Energy Metering IC with Pulse Output
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ADE7752/ADE7752A
Rev. C | Page 6 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
TOP VIEW
(Not to Scale)
ADE7752/
ADE7752A
REFIN/OUT
AGND
ICN
ICP
IBN
CF
DGND
VDD
REVP
IBP
IAN
IAP
VN
VCP
VBP
VAP
ABS
S0
F2
S1
F1
SCF
CLKIN
CLKOUT
2
3
4
5
6
7
8
9
10
11
12
1
24
23
22
21
20
19
18
17
16
15
14
13
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
CF
Calibration Frequency Logic Output. The CF logic output gives instantaneous real power information.
This output is intended to be used for calibration purposes. See the SCF pin description.
2
DGND
This provides the ground reference for the digital circuitry in the ADE7752: the multiplier, filters, and
digital-to-frequency converter. Because the digital return currents in the ADE7752 are small, it is
acceptable to connect this pin to the analog ground plane of the whole system.
3
VDD
Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7752. The supply
voltage should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled to
DGND with a 10 μF capacitor in parallel with a 100 nF ceramic capacitor.
4
REVP
This logic output goes logic high when negative power is detected on any of the three phase inputs,
that is, when the phase angle between the voltage and the current signals is greater than 90°. This
output is not latched and is reset when positive power is once again detected. See the Negative Power
Information section.
5, 6;
7, 8;
9, 10
IAP, IAN;
IBP, IBN;
ICP, ICN
Analog Inputs for Current Channel. This channel is intended for use with the current transducer and is
referenced in this document as the current channel. These inputs are fully differential voltage inputs
with maximum differential input signal levels of ±0.5 V. See the Analog Inputs section. Both inputs have
internal ESD protection circuitry. In addition, an overvoltage of ±6 V can be sustained on these inputs
without risk of permanent damage.
11
AGND
This pin provides the ground reference for the analog circuitry in the ADE7752: the ADCs, temperature
sensor, and reference. This pin should be tied to the analog ground plane or the quietest ground
reference in the system. This quiet ground reference should be used for all analog circuitry, such as
antialiasing filters, current and voltage transducers, and so on. To keep ground noise around the
ADE7752 to a minimum, the quiet ground plane should connect to the digital ground plane at only
one point. It is acceptable to place the entire device on the analog ground plane.
12
REFIN/OUT
This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value of
2.4 V ± 8% and a typical temperature coefficient of 20 ppm/°C. An external reference source may also be
connected at this pin. In either case, this pin should be decoupled to AGND with a 1 μF ceramic capacitor.
13–16
VN, VCP, VBP,
VAP
Analog Inputs for the Voltage Channel. This channel is intended for use with the voltage transducer and
is referenced in this document as the voltage channel. These inputs are single-ended voltage inputs with
a maximum signal level of ±0.5 V with respect to VN for specified operation. All inputs have internal ESD
protection circuitry. In addition, an overvoltage of ± 6 V can be sustained on these inputs without risk of
permanent damage.
17
ABS
This logic input is used to select the way the three active energies from the three phases are summed.
This offers the designer the capability to do the arithmetical sum of the three energies (ABS logic high)
or the sum of the absolute values (ABS logic low). See the Mode Selection of the Sum of the Three Active
Energies section.
18
SCF
Select Calibration Frequency. This logic input is used to select the frequency on the calibration output
CF. Table 7 shows how the calibration frequencies are selected.


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