EVAL-ADE7756EB Datasheet, PDF (15/15 Pages) Analog Devices – Evaluation Board Documentation AD7756 Energy metering IC

PRELIMINARY TECHNICAL DATA
PRELIMINARY TECHNICAL DATA
EVAL-ADE7756EB
Recommendation
The sensitivity to ground noise of the analog section of the
system leads to select with cautious the set up of the
evaluation board.
To obtain the best performances from the evaluation board,
when it is used in a real meter configuration (Voltage = 220V
and current sensor connected), the configuration of Table1
should be applied.
This set up requires three 5volts Power supplies, an addi-
tional Ferrite Bead (Type Panasonic, EXCELSA391) and
the disconnection of U2.
If the CF pin is used to measure the accuracy of the system,
the connection between the ADE7756's CF pin and the input
of the opto-isolator should be restored by connecting U2.8
and U2.9 - Figure 13. The trace between BNC2 connector and
the SUB-D25 P1 connector should also been cut if this
connector is used to connect a PC via the parallel cable - Figure
12.
PCB Layout - Solder side change
JUMPER
JP1
JP2
JP3
JP4
JP5 A
JP5 B
JP6 A
JP6 B
JP7
JP8
JP9
JP10
JP11
JP12 A
JP12 B
JP13
JP14
JP15
JP19 A
JP19 B
JP20
JP21
JP25
JP51
OPTION
Open
Open
Open
Closed
Open
Open
Open
Open
Open
Open
Open
Open
Closed
Closed
Closed
Open
Open
Open
Closed
Closed
Open
Closed
Open
Closed
Closed
Comments
If shunt used
If CT used
Use Ferrite to close connec
tion (type Panasonic
EXCELSA391)
Table 1: Evaluation board configuration
Figure 12 - Solder side change
-
5.000 V
+
+
5.000 V
-
5.000 V
REV. PrB 01/01
L
Ferrite Bead
U2 removed and connection between
U2.8 and U2.9 restored
:Jumper closed
:Jumper open
Figure13 - Evaluation board configuration
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