Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

VGA to PAL and NTSC video convertor

Status
Not open for further replies.

emresel

Full Member level 5
Joined
Feb 12, 2008
Messages
262
Helped
61
Reputation
122
Reaction score
60
Trophy points
1,308
Location
Turkiye
Activity points
2,828
Hi;
VGA output timings is important to able to see generated CVBS video on a commercial TV.
In general, VGA signal horizontal and vertical timings is not well fits TV composite signal timings.
Please check datasheet of AD722, below note from spec is important (first be sure if your VGA card can generate proper signal);
Displaying VGA Output on a TV
The AD722 can be used to convert the analog RGB output from a
personal computer’s VGA card to the NTSC or PAL television
standards. To accomplish this it is important to understand that
the AD722 requires interlaced RGB video and clock rates that
are consistent with those required by the television standards. In
most computers the default output is a noninterlaced RGB sig-
nal at a frame rate higher than used by either NTSC or PAL.
Most VGA controllers support a wide variety of output modes
that are controlled by altering the contents of internal registers.
It is best to consult with the VGA controller manufacturer to
determine the exact configuration required to provide an inter-
laced output at 60 Hz (50 Hz for PAL).
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top