VS6552 Datasheet, PDF (23/26 Pages) STMicroelectronics – VGA Color CMOS Image Sensor Module

VS6552
8 APPLICATION INFORMATION
8.1 Socket
ST has developed a low-profile socket for the
SmOP 1.5 package, which is suitable for reflow
soldering and manual / automatic insertion of the
camera module. The socket has been designed to
withstand mobile phone grade reliability tests
(temperature, shocks, vibration, salt mist).
Please contact ST for details on ST P/N XS0015.
See Figure 16 for recommended PCB layout and
mechanical footprint of the XS0015 socket.
8.2 EMC and Shielding
The VS6552 is a low noise device and is highly tol-
erant of high levels of radio frequency (RF) radia-
tion. However if this device is closely mounted to a
sensitive receiver it is recommended that the
VS6552 is shielded to prevent reducing the sensi-
tivity or channel masking of the receiver.
Recommended maximum field strength: 1kV/m.
Maximum radiated power transferred from the
VS6552 into a GSM monopole antenna mounted
15 mm away from the VS6552 has peaks of inter-
ference at around -90 dBm. This is dependent on
system design and layout.
To minimized the coupling between the GSM an-
tenna and the sensor the following guide lines
should be observed.
Camera should be positioned as far away from the
GSM antenna as possible. The distance between
the low frequency (below 1GHz) resonant antenna
elements and the camera should also be maxi-
mized.
The VS6552 and its associated decoupling capac-
itors should NOT be connected together using the
antenna reference ground. The ground connec-
tions in the sub circuit should be connected either:
■ by a dedicated ground trace network, that is
connected by a single point to the main ground
of the system
■ by an internal ground plane, which is entirely
covered and single point connected to a
protective ground.
The PCLKP and PCLKN lines can be filtered to re-
duce the induced noise.
The protective ground should be flooded around
the sensor socket pads to reduce the radiation ap-
erture in the protective ground plane.
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