ADE7933 datasheet(96/125 Pages) AD

96 / 125 page

ADE7978/ADE7933/ADE7932/ADE7923

Data Sheet

Rev. D | Page 96 of 125

Because a 4-layer PCB is used, a stitching capacitor is created

between Layer 2 and Layer 3.

Note that the first layer components placed on the isolated

secondary side of the ADE7933 are surrounded by a ground plane

connected to GNDISO. The second layer also has the same

ground plane on the secondary side of the PCB. The third layer

extends the ground of the primary side below the ADE7933 and

the related circuitry, creating a stitching capacitor. This

capacitance has an important role in reducing the emissions

generated by the dc-to-dc converter of the ADE7933/ADE7932.

Note that a distance of at least 8 mm is maintained on both sides

between the input pins on the board and the ground planes.

Layer 4 has the ground plane on the primary side of the ADE7933.

Figure 124 shows the structure of the stitching capacitor created

by a 4-layer PCB. The isolated ground plane of the second layer

creates a capacitor (C23) with approximately an 1100 mm2 area

and 100 pF capacitance, including the device, with the primary

side ground plane placed on Layer 3.

This capacitance plays 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 THREE

ISOLATED SIDE GROUND

PLANE ON LAYER TWO

PRIMARY SIDE GROUND

PLANE ON BOTTOM LAYER

20MILS = 0.508mm MIN

C23

8mm

50MILS = 1.27mm

62MILS ± 10% =

1.574mm NOMINAL

Figure 124. Stitching Capacitors Created by 4-Layer PCB

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