User's Manual
T-0000-0004-V2.1: Using Mozart II
T-0000-0004-V2.1: Using Mozart II Page: 14 / 24
13 Wi-Fi connectivity
The module comes with a built-in B/G/N Wi-Fi adapter with an optional external antenna connector in
standard configurations.
14 Physical Mounting Considerations
The connectors of the module are not suitable for mechanical fixation. The module has metalized
holes for this purpose, and they also serve as ground points. Therefore, the daughterboard must have
the matching grounded holes and the fixation must go through metallic risers. The positioning
information is included in this document.
The matching connectors can be of traditional or SMD type. We recommend SMD type, since the
routing of differential signals (given the pinout) can prove cumbersome if through-hole parts are used
– this is especially true when close matching must be followed, such as Ethernet tracks.
15 FM antenna
The module has an integrated silicon tuner that only needs antenna connection to receive FM stereo.
The FM tuner can cope (at the expense of software configuration) with worldwide FM standards (US,
Japan and Europe). It is highly recommended to feed this input through filtering of spurious signals –
prebuilt printed filters are the cheapest way to proceed. A good, proven part is made by Soshin
Electric Co, Ltd under the reference GFMB3 SE. Dangling wire or telescopic antennas are suitable for
the purpose.
Note that if coaxial cable is used to feed the input, the ground of this cable must be referenced to the
DIGITAL ground. Protection against ESD can be achieved through regular diodes between antenna
and ground, located as close as possible to the pass-through point of the antenna from the outside to
the inside of the device.
FM antenna
D4
1N4148
D5
1N4148
Conn Antenna
J10
1
2
FM_Antenna
U5GFMB3 SE
In
1
GND
2
Out
3
DGND
C56
22p 50V
C57
100p 50V
16 EMC
Although the module itself has been designed and validated not to radiate by itself, there is a number
of external signals that go through the device and that might (depending on their routing and placing)
act as antennas.
EMC concerns (according to EN55022 – and FCC Part15 and EN55024) are mostly:
• Radiated emissions