ADAF1080BCPZ datasheet(34/36 Pages) AD

34 / 36 page

Data Sheet

ADAF1080

CIRCUIT BOARD LAYOUT RECOMMENDATIONS

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Rev. 0 | 34 of 36

Any current carrying traces near the ADAF1080 produce a magnet-

ic field. To minimize the impact of these stray fields of measure-

ment, Analog Devices, Inc., recommends the following:

1. Keep any current carrying traces as far from the ADAF1080 as

possible.

2. Route any current carrying traces to the ADAF1080 on the

same layer as the ADAF1080. To a first order, the resultant

magnetic field is perpendicular to the ADAF1080 (through the

top of the package), as shown in Figure 60.

Figure 60. Current Carrying Traces on PCB Routed on the Same Layer

as the ADAF1080

3. Keep any current carrying vias as far from the ADAF1080 as

possible. The field generated from current carrying vias can

result in a magnetic field vector in the same plane as the

ADAF1080, which can be detected by the AMR sensor and

impact the accuracy of the sense field measurement, as shown

in Figure 61.

Figure 61. Current Carrying Vias Placed as Far Away from the ADAF1080

as Possible

4. Avoid magnetic materials near the ADAF1080 because these

materials distort the magnetic fields near the device and can

introduce a magnetic offset. Use nylon or plastic materials for

mounting structures, screws, and supports.

RECOMMENDED PCB LAYOUT

Figure 62 and Figure 63 show the recommended layouts for a

single sensor for either a 2-layer PCB implementation or for a

3-layer or more PCB implementation.

Figure 62. Recommended Layout for 2-Layer PCB

Figure 63. Recommended Layout for a 3-Layer PCB

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