Part # Application Notes Television Video Imaging datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: STMAV340 evaluation board & PCB layout recommendation


Part Details:

AN2526 Application note STMAV340 evaluation board & PCB layout recommendation Introduction STMAV340 has 4 channels and a 2 to 1 video switch that is well suited for switching analog video signals on a TV or monitor set. Below is a diagram of STMAV340 typical application configuration. As illustrated on the picture below, the 3 channels of the switch can be used to switch two complete sets of RGB and YPbPr to a single RGB/YPbPr output. One additional channel can be used to switch 2 CBVS inputs to a single output that can be directly connected to a single CVBS receiver input. Without STMAV340 integrated in the system, the video receiver needs to have more input pins to accommodate the many video inputs at the back panel. With the introduction of STMAV340, less IO pins are required at the video receiver. Together with the optimized pin arrangement, the result is a straightforward system design and overall cost reduction. STMAV340 in a TV application VIDEO RECEIVER R/Y G/Pb B/Pr CVBS H/V SYNC STMAV340 ID/VESA R Y G Pb B Pr CVBS1/2 April 2007 Rev 1 1/10 www.st.com Contents AN2526 Contents 1 Evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 PCB layout recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2/10 AN2526 Evaluation board 1 Evaluation board The evaluation board was designed with trouble-free customer evaluation in mind. Instead of having two sets of RGB (VGA connector) and YPbPr (RCA connector) as inputs and branching the output to the VGA and RCA connectors, two VGA RGB inputs are connected and the outputs go directly to single VGA connector to a display unit. For the evaluation, the customer can connect the two sets of inputs to two VGA port of PC, while the output can be directly connected to the VGA port of the display unit. Power supply The board can be powered either directly from a DC power supply or from a DC adaptor. If it is powered from 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 is 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 the digital lines switching from coupling to the analog lines, the power distribution is separated from digital and analog sections. Although STMAV340 has also two digital lines, which are OE and SEL, it should still be powered from the analog supply because its main function is to switch analog signals and those two digital lines are mostly static during operation. Hence the analog lines are not disturbed by the digital part and, as such, there is no need to have a separate analog and digital supply for STMAV340. The analog and digital sections on the board are isolated by ferrite beads. Table 1. STMAV340 Demo board power supply Designator Notes VCC5V Connect to 5 V of external power supply. GND Connect to ground of external power supply.


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Application Notes Television Video Imaging .pdf Datasheet