Adeunis RF ARF26 Посібник користувача - Сторінка 12

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INTEGRATION

• Daughter board:

This daughter board is to be incorporated directly on an electronics mother board by means of

the "COMCLIP" connectors provided on the radio module (cf. dimensions and pin

assignment in chapter 3 of this document).

The mother board can be used to locate the antenna output by means of a 50 Ω printed line.

This line is formed by a printed track 2.5 mm wide which must be situated above a continuous

ground plane (the HF cold point is to be connected as short as possible to this plane). Avoid

running close to digital lines!

• EMC aspect:

When a radio element is integrated in an electronics system, the mother board must be

provided with a ground plane which is as continuous as possible. The GND and GND RF

signals of the module are to be connected as short as possible to this plane. It is preferable that

the module then be fitted on the ground plane side, opposite from the tracks.

Due to the presence of a Receiver part (for the transceiver), some precautions have to be taken

when integrating the ARF26 module. Fitting a receiver with a good sensitivity alongside a

high-speed digital part requires a little succinct filtering described by the diagram below:

A RECEIVER WITHOUT A SQUELCH GENERATES NOISE ON OUTPUT IN THE

ABSENCE OF A RECEIPT SIGNAL. THIS DOES NOT HOWEVER MEAN THAT IT

IS POLLUTED BY INTERFERENCE; THE DATA WILL BE "CLEAR" WHEN

RECEIPT TAKES PLACE.

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