SC14CVMDECT datasheet(48/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

48 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

8.4 MODULE PLACEMENT ON THE MAIN BOARD

In order to ensure FCC compliance, proper coverage

and to avoid detuning of the antennas, it is required to

place the module free on the main board in relation to

other surrounding materials.

Keep a distance of at least 10 mm from the antenna

elements to conducting objects and at least 5 mm to

non-conducting objects.

Keep in mind that electrical shielding objects, even

partly surrounding the antennas, will normally cause a

significant degradation of the coverage.

Place the module at the edge of the main-board as

shown in Figure 37.

If the module has to be placed away from the edge of

the main board, then avoid conducting areas in front of

the antennas and make a cut-out in the main board

underneath the antennas as shown in the figure.

Keep solid ground on layer 2 out to the edges of the

main board as shown in the figure.

8.5 PATTERN FOR PIN 79 ON THE MAIN BOARD

The copper pattern for pin 79 on the main board is very

important because it is part of the internal antenna of

the module. It is used to extend the internal antenna for

optimum RF performance.

The PCB pattern shown in Figure 41 under “pads C” for

pin 79 on the main board was used during module cer-

tification.

8.6 PRECAUTIONS REGARDING UNINTENDED

COUPLING

The SC14CVMDECT SF includes an internal antenna,

so at integration on the main board precautions shall

be taken in order to avoid any kind of coupling from the

main board to the RF part of the module.

If there is any doubt about this, a brief radio test should

be performed.

Figure 37: Module placement on the main board (top view)

No P C B a re a

GN D

G N D

Ma in b o a rd

Mo d u le

ante nn a exte nsio n

> 10 m m

> 1 0 m m

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