ADE7978 datasheet(90/120 Pages) AD

90 / 120 page

ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 90 of 120

If 4-layer PCBs are used, additional stitching capacitors can

be created. The top and bottom layers remain unchanged (see

Figure 113 and Figure 114). Layer 2 of the 4-layer PCB replicates

the bottom layer, extending the ground of the primary side below

the ADE7933 and the related circuitry. Layer 3 replicates the

ground plane of the top layer.

Figure 115 shows the structure of the stitching capacitors

created by a 4-layer PCB. 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

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

These capacitances play an important role in reducing the

emissions generated by the ADE7933/ADE7932 dc-to-dc

converter.

ADE7978 AND ADE7933/ADE7932 EVALUATION

BOARD

An evaluation board built upon the ADE7978 and ADE7933

chipset configuration is available (see the Ordering Guide). This

board is used in conjunction with the system demonstration

platform (EVAL-SDP-CB1Z). Order both the ADE7978/

ADE7933 evaluation board and the system demonstration

platform to evaluate the ADE7978 and ADE7933. For more

information, see the ADE7978 product page.

ADE7978 DIE VERSION

The version register identifies the version of the ADE7978 die.

This 8-bit, read-only register is located at Address 0xE707.

ADE7932/ADE7933

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

28MILS = 0.7112mm

4MILS = 0.1016mm

28MILS = 0.7112mm

C12

C23

8mm

1mm

Figure 115. Stitching Capacitors Created by 4-Layer PCB

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