PACVGA105_11 Datasheet, PDF (5/6 Pages) ON Semiconductor – VGA Port Companion Circuit

PACVGA105
APPLICATION INFORMATION
To Video
DAC V_DD
5V
0.2 mF 0.2 mF
3.3 V
H−Sync
V−Sync
DDC_Data
DDC_Clk
Red
Green
Blue _{ÎÎÎÎÎÎÎÎÎÎÎÎ}
4
V_RGB
2
HSYNC
14
VSYNC
10
DDC_DATA
12
DDC_CLK
9, 16
V_CC
13
V_AUX
8
GNDA
3, 11
GNDD
Digital
GND
Analog
GND
PACVGA105
1
HSYNC_OUT
7
6R
ÎÎÎÎÎÎÎÎÎ ^{VSYNC_OUT 15}
5G
B
H−Sync
V−Sync
DDC_Data
DDC_Clk
Red
Green
Blue
VF** − VIDEO EMI Filter
SF** − SYNC EMI Filter
Figure 1. Typical Connection Diagram
GNDA, the negative voltage rail for the R, G and B diodes is not connected internally to GNDD. GNDA should ideally be
connected to the ground of the video DAC IC. This will prevent any ground bounce caused by digital signals from injecting
noise onto the R, G and B signals. Analog GND and digital GND are typically connected on the printed circuit board.
http://onsemi.com
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