Part # Application Notes Display Monitor Imaging datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Using the STVM100 to fully auto adjust LCD flicker


Part Details:

==> ./downloads/Application Notes Consumer Display Monitor Imaging s.html AN2471 Application note STMAV335 evaluation board & PCB layout recommendation Introduction STMAV335 has three sets of 3 to 1 switches that are well suited for switching analog video signals on the back panel of television sets or monitors. Below is a diagram of an STMAV335 typical application configuration: Typical display unit back panel video input V ID E O R E C E IV E R Y PbPr O R R G B O R C V B S& S-V ID E O ST M A V 335 Y PbPr R G B C V B S& S-V ID E O As illustrated above, STMAV335 is used to switch one of the three video input sets to the video receiver. Depending on the SEL inputs, YPbPr, RGB, or CVBS&S-VIDEO signals will be directed to the video receiver. Hence less IO is required at the video receiver to handle the many different video signal inputs on the display unit back panel. Ultimately, integrating STMAV335 to the system will result in a straightforward system design and overall cost reduction. March 2007 Rev 1 1/12 www.st.com Contents AN2471 Contents 1 Evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Video input & output ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Video input conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 PCB layout recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 AN2471 Evaluation board 1 Evaluation board The STMAV335 evaluation board provides the customer with straightforward evaluation on the performance and the typical use of the switch in the real system. The boards include an STMAV335 switch, video input and output connectors, jumper for setting the control lines status, and a power supply portion. 1.1 Power supply The board can be powered either directly from a DC power supply or from a DC adaptor. If it is powered from a DC power supply, 5VDC is connected to the power socket labeled VCC5V and the ground is connected to the power socket labeled GND. The board can also be powered from a DC adaptor having output voltage of 7 V to 15 V. The DC adaptor voltage will be regulated to 5 V by the on-board regulator. The DC adaptor can be center positive or negative and it should be connected to the DC JACK. To prevent digital noise from coupling to the analog lines, the power distribution is separated from digital and analog sections. Though STMAV335 has also two digital lines, which are SEL1 and SEL2, it should still be powered from the analog supply. The reason is because its main function is to switch analog signals and those two digital lines are mostly static during operation. Hence the analog lines will not be disturbed by the digital part and as such, there is no need to have a separate analog and digital supply for STMAV335. The analog and digital sections on the board are isolated by ferrite beads. Table 1. Power connector Designator Notes VCC5V


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