ADE7912 datasheet(39/44 Pages) AD

39 / 44 page

Data Sheet

ADE7912/ADE7913

Rev. 0 | Page 39 of 44

Figure 58. 4-Layer Circuit Board: Bottom Layer

Figure 59. Stitching Capacitors Created by 4-Layer PCB

If a 4-layer PCB is used, additional stitching capacitors can be

created. On the top layer, all components placed on the isolated

secondary side are surrounded by a ground plane connected to

GNDISO, Pin 10 (see Figure 57). Layer 2 (see Figure 60)

replicates the bottom layer of the 2-layer circuit board

approach, extending the ground of the primary side below the

ADE7912/ADE7913 and the related circuitry. Layer 3 (see

Figure 61) replicates the ground plane of the top layer. The

bottom layer does not have the ground of the primary side

below the ADE7912/ADE7913 and the related circuitry as in

the 2-layer circuit board approach because the corresponding

stitching capacitor created with Layer 3 does not have any effect

in reducing the emissions.

The structure of the stitching capacitors created by a 4-layer

PCB is shown in Figure 59. The isolated ground plane of the top

layer creates the 10 pF capacitor (C12) with the primary side

ground plane placed on Layer 2. In a similar manner, the 400 pF

(C23) capacitor is created between Layer 2 and Layer 3.

These capacitances have an important role in reducing the

emissions generated by the ADE7912/ADE7913 dc-to-dc

converter.

ADE7913 EVALUATION BOARD

An evaluation board built upon the ADE7913 allows users

to quickly evaluate this IC. It is used in conjunction with

the system demonstration platform (EVAL-SDP-CB1Z).

Order both the ADE7913 evaluation board and the system

demonstration platform to evaluate the ADE7913. Visit

www.analog.com/ADE7913 for details.

ADE7912/ADE7913 VERSION

Bits[2:0] (version) in the STATUS1 register identify the version

of the ADE7912/ADE7913.

ADE7912/ADE7913

PRIMARY SIDE GROUND

PLANE ON TOP LAYER

ISOLATED SIDE GROUND

PLANE ON TOP LAYER

PRIMARY SIDE GROUND

PLANE ON LAYER 2

ISOLATED SIDE GROUND

PLANE ON LAYER 3

PRIMARY SIDE GROUND

PLANE ON BOTTOM LAYER

C12

C23

28mils = 0.7112mm

4mils = 0.1016mm

8mm

1mm

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