FreeLists / si-list / [SI-LIST] Re: VGA/VIDEO: IMPEDANCE & LENGTH

[stephanie.k.goedecke@xxxxxxxxxxxxxx]

No, it doesn't include that.  And some video standards are to 1V p-p.  
I think this is the standard Chandan was asking about.

-Stephanie

> -----Original Message-----
> From: Larry Miller [SMTP:lmiller@xxxxxxxxxxxxxxxxxxxx]
> Sent: Wednesday, August 01, 2001 1:42 PM
> To:   Goedecke, Stephanie K; chandan_career@xxxxxxxxx;
> si-list@xxxxxxxxxxxxx
> Subject:      RE: [SI-LIST] Re: VGA/VIDEO: IMPEDANCE & LENGTH
> 
> Does the RGB 0.700v include the blanking pedestal? I thought that brought
> the whole shebang up to 1 v p-p.
> 
> Larry Miller
> 
> -----Original Message-----
> From: stephanie.k.goedecke@xxxxxxxxxxxxxx
> [mailto:stephanie.k.goedecke@xxxxxxxxxxxxxx]
> Sent: Wednesday, August 01, 2001 1:19 PM
> To: chandan_career@xxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: VGA/VIDEO: IMPEDANCE & LENGTH
> 
> 
> 
> The HSYNC and VSYNC signals have TTL levels.  I often see 300-1k ohm
> series resistors on them.  
> 
> The analog R,G and B should be 75ohms.  The maximum voltage should be 
> 0.700 Volts + 0.07 Volts/-0.035 Volts
> 
> You can get the VSIS standard from 
> 
> Video Electronics Standards Association
> 920 Hillview Court, Suite 140
> Milpitas, CA 95035
> 408-957-9270
> 
> 
> > -----Original Message-----
> > From:       Chandan [SMTP:chandan_career@xxxxxxxxx]
> > Sent:       Wednesday, August 01, 2001 9:24 AM
> > To: SI FORUM
> > Subject:    [SI-LIST] VGA/VIDEO: IMPEDANCE & LENGTH
> > 
> > 
> > Hi everybody,
> > 
> > The video interface between a motherboard & a monitor
> > typically consists of the following signals:
> > 1. RED, GREEN & BLUE
> > 2. HSYNC, VSYNC etc.
> > 
> > My questions: 
> > 1. Are there specifications for the characteristic
> > impedance of these signals? For e.g., the USB
> > specification defines the characteristic impedance
> > with which the USB signals must be routed with.
> > I'm not too sure, but I think that the RED, GREEN &
> > BLUE lines must be routed with a characteristic
> > impedance of 37.5 ohms, whereas the HSYNC & VSYNC
> > signals must be routed with a trace of characteristic
> > impedance of 40 ohms. Could someone clarify please.
> > 
> > 2. Are there specifications for the maximum length of
> > these signals? 
> > As of now, I think that the length on the motherboard
> > really does not matter. This is because, after the
> > signals leave the motherboard, the cable that connects
> > to the monitor is at least a foot in length. PLease
> > comment.
> > 
> > Thanks,
> > Chandan 
> > 
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