[SI-LIST] Re: VGA/VIDEO: IMPEDANCE & LENGTH
- From: stephanie.k.goedecke@xxxxxxxxxxxxxx
- To: chandan_career@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 1 Aug 2001 13:19:22 -0700
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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