VS6552V02CSLASHT2 datasheet(23/26 Pages) STMICROELECTRONICS

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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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