Analog Devices EVAL-ADE9113 User Manual page 6

User Guide
EVALUATION BOARD HARDWARE
R = ×
31.25 × 10 −3
1
I FS
2
31 . 25 × 10 −3
where:
2
is the RMS value of the full-scale voltage accepted
at the ADC input.
I is the maximum full-scale current to be measured.
FS
Figure 5 shows how a shunt is connected to the Phase A current
input structure. The shunt is connected between the phase line and
the phase load of the energy meter Phase A line inputs. The I1P_A
and I1M_A test pins are connected to the shunt measurement
poles, while AGND_A, the test pin that is the ground of the Phase A
ADE9113 side, is connected to the ground pole of the shunt.
Figure 4. Phase A Current Input Structure on the EVAL-ADE9113EBZ
Figure 5. Example of a Shunt Connection
Phase Voltage Sense Inputs (V1P_x Test Pins)
The phase-to-neutral voltage input connections on the EVAL-
ADE9113EBZ can be directly connected to the line voltage sources
between V1P_A and AGND_A for Phase A to the neutral voltage,
between V1P_B and AGND_B for Phase B to the neutral voltage,
and between V1P_C and AGND_C for Phase C to the neutral volt-
age. These voltages are attenuated using a simple resistor divider
network before they are supplied to the ADE9113. The attenuation
analog.com
network on the voltage channels is designed so that the corner
(1)
frequency (3 dB frequency) of the network matches the antialiasing
filters in the current channel inputs to prevent the occurrence of
large energy errors at low power factors.
The V1P_A path in
Phase A voltage inputs; the resistor divider consists of three 330
kΩ resistors (R6A, R7A, and R8A) and one 1 kΩ resistor (R9A).
The antialiasing filter R9A and C18A matches the R10A and C4A
filter in the V1M path. The absolute maximum voltages on the V1P
and V1M pins of the ADE9113 are ±2 V. The maximum signal level
permissible at the V1P pin of the ADE9113 is ±0.5 V peak. The
signal range must not exceed ±0.6 V with respect to AGND_ISO1
for the specified operation. Test point V1M_A is available if using
the ADC differentially is required. An external voltage divider must
be added to V1M_A to match V1P_A.
Auxiliary Voltage Sense Inputs (V2P_x Test
Pins)
The auxiliary voltage input connections on the EVAL-ADE9113EBZ
can be directly connected to the line voltage sources between
V2P_x and AGND_x for the Phase A, B, C, or N auxiliary voltage.
The V2P_x path is similar to the V1P_A path shown in
Figure 6. Phase A Voltage Input Structure on the EVAL-ADE9113EBZ
Isolated Ground Pins Management
The ADE9113 package has four isolated ground pins, two are
GND , Pin 1 and Pin 3, two are AGND, Pin 5 and 11. Internally,
ISO
Pin 1 and Pin 3 are tied together, and Pin 5 and Pin 11 are tied
together. The AGND_x test point is directly connected to the AGND
pins, and it is only connected to GND
E1x and E2x. This division is critical to help manage RF emissions
and, therefore, any external connections are connected to AGND.
EVAL-ADE9113
Figure 6 shows a typical connection of the
through the ferrite beads,
ISO
Figure 6
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