Rastergraf Topaz, User Manual

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Rastergraf
General Information 1-17
1.5 AD9882 RGBHV/DVI Digitizer
The AD9882 is a complete 8-bit 140 MSPS monolithic analog interface
optimized for capturing RGB graphics signals. Its 140 MSPS encode rate
capability and full-power analog bandwidth of 300 MHz supports
resolutions up to SXGA (1280 x 1024 at 75 Hz).
The AD9882’s on-chip PLL generates a pixel clock from HSYNC. Pixel
clock output frequencies range from 12 to 140 MHz. PLL clock jitter is
500ps p-p typical at 140 MSPS. The AD9882 also offers full sync
processing for composite sync and sync-on-green (SOG) applications.
The AD9882 also contains a DVI 1.0 compatible receiver and supports
display resolutions up to SXGA (1280 x 1024 at 60 Hz). The receiver
operates with true color (24 bit) panels and also features an intrapair skew
tolerance of up to one full clock cycle.
Figure 1-12 AD9882 High Speed Digitizer Block Diagram
A/D
CLAMP R
AIN
G
AIN
B
AIN
SOGIN
HSYNC
SYNC
PROCESSING AND
CLOCK
GENERATION
FILT
VSYNC
SCL
SDA
A
0
R
X0+
R
X0–
R
X1+
R
X1–
R
X2+
R
X2–
R
XC+
R
XC–
R
TERM
DDCSCL
DDCSDA
MCL
MDA
8
A/D
CLAMP
8
A/D
CLAMP
8
ANALOG INTERFACE
MUXES
DATACK
HSOUT
VSOUT
SOGOUT
8
REF
R
OUT
G
OUT
B
OUT
R
OUT
G
OUT
B
OUT
R
OUT
G
OUT
B
OUT
DATACK
DE
HSYNC
VSYNC
DATACK
HSOUT
CSOUT
SOGOUT
DE
REFBYPASS
8
8
DVI
RECEIVER
HDCP
8
8
8
AD9882A
SERIAL REGISTER AND
POWER MANAGEMENT
DIGITAL INTERFACE
05123-
001