PRELIMINARY TECHNICAL DATA

EVAL-ADE7756EB

–15–

REV. PrB 01/01

PRELIMINARYTECHNICALDATA

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

Figure 12 - Solder side change

JUMPER

OPTION

Comments

JP1

Open

JP2

Open

JP3

Open

JP4

Closed

If shunt used

Open

If CT used

JP5 A

Open

JP5 B

Open

JP6 A

Open

JP6 B

Open

JP7

Open

JP8

Open

JP9

Open

JP10

Closed

JP11

Closed

Use Ferrite to close connec

tion (type Panasonic

EXCELSA391)

JP12 A

Closed

JP12 B

Open

JP13

Open

JP14

Open

JP15

Closed

JP19 A

Closed

JP19 B

Open

JP20

Closed

JP21

Open

JP25

Closed

JP51

Closed

Table 1: Evaluation board configuration

L

:Jumper closed

:Jumper open

+

-

5.000 V

-

+

5.000 V

5.000 V

U2 removed and connection between

U2.8 and U2.9 restored

Ferrite Bead

Figure13 - Evaluation board configuration