ADE7762ARWZ Analog Devices Inc, ADE7762ARWZ Datasheet - Page 26

• Manufacturer Part Number: ADE7762ARWZ
• Description: IC, POLYPHASE ENERGY METERING, SOIC-28
• Manufacturer: Analog Devices Inc

Specifications of ADE7762ARWZ

• Ic Function: Polyphase Energy Metering IC With Phase Drop Indication
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOIC
• No. Of Pins: 28
• Input Impedance: 140 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 8.5mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Meter Type: 3 Phase
• Brief Features: On-Chip Creep Protection, High Frequency Output
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADE7762EBZ - BOARD EVALUATION FOR ADE7762
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

ADE7762
NO-LOAD THRESHOLD
The ADE7762 includes an innovative no-load threshold detection
scheme that detects if a current input, when multiplied with any
of the three voltage inputs, cannot create power larger than a no-
load threshold. This threshold represents 0.0075% of the full-
scale output frequency.
For example, if the A, B, and C voltage phases are 50% of full-
scale input and 120° apart, and Current Phase A is 10% of full
scale with a PF = 0, this detection scheme detects that VA × IA
is below the no-load threshold but that VB × IA and VC × IA are
not. Therefore, the ADE7762 does not detect a no-load threshold
for V
However, in the same voltage conditions, if Current Phase A is
0.0075% of full scale with a PF = 1, this detection scheme detects
that V
and V
threshold, and its contribution to the total power is stopped.
A
C
A
× I
× I
× I
A
A
A
and lets this phase contribute to the total power.
are as well, V
is below the no-load threshold. Because V
A
× I
A
is detected as below the no-load
B
× I
A
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The no-load threshold is given as 0.0075% of the full-scale
output frequency for each of the f
For example, for an energy meter with a 100 imp/kWh meter
constant using f
at F1 or F2 is 1.38 × 10
(16 × F1 Hz). In this example, the no-load threshold is equiva-
lent to 4.8 W of load, or a start-up current of 20.7 mA at 240 V.
Table 10. CF, F1, and F2 Minimum Frequency at No-Load
Threshold
SCF
0
1
0
1
0
1
0
1
S1
0
0
0
0
1
1
1
1
S0
0
0
1
1
0
0
1
1
1 to 7
F1, F2 Minimum (Hz)
6.92E − 05
1.38E − 04
3.46E − 05
1.38E − 04
1.57E − 04
3.46E − 05
1.73E − 05
1.753 − 05
(4.49 Hz), the minimum output frequency
−4
Hz. This is 2.21 × 10
1 to 7
frequencies (see Table 10).
CF Minimum (Hz)
1.11E − 03
1.11E − 03
1.11E − 03
2.21E − 03
2.51E − 02
5.53E − 04
5.53E − 04
2.77E − 04
−3
Hz at CF