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ADV7122 데이터시트(PDF) 8 Page - Analog Devices

부품명 ADV7122
상세설명  CMOS 80 MHz, Triple 10-Bit Video DACs
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ADV7121/ADV7122
–8–
REV. B
If we, therefore, have a graphics system with a 1024
× 1024
resolution, a noninterlaced 60 Hz refresh rate and a retrace fac-
tor of 0.8, then:
Dot Rate =
1024
× 1024 × 60/0.8
=
78.6 MHz
The required CLOCK frequency is thus 78.6 MHz.
All video data and control inputs are latched into the ADV7121/
ADV7122 on the rising edge of CLOCK, as previously de-
scribed in the “Digital Inputs” section. It is recommended that
the CLOCK input to the ADV7121/ADV7122 be driven by a
TTL buffer (e.g., 74F244).
92.5 IRE
7.5 IRE
40 IRE
WHITE LEVEL
BLACK LEVEL
BLANK LEVEL
SYNC LEVEL
19.05
0.714
26.67 1.000
1.44
0.054
9.05
0.340
0
0
7.62
0.286
0
0
mA
V
mA
V
RED, BLUE
GREEN
NOTES
1. OUTPUTS CONNECTED TO A DOUBLY TERMINATED 75
LOAD.
2. VREF = 1.235V, RSET = 560Ω.
3. RS–343A LEVELS AND TOLERANCES ASSUMED ON ALL
LEVELS.
Figure 3. RGB Video Output Waveform
Table Ia. Video Output Truth Table for the ADV7122
IOG
IOR, IOB
DAC
Description
(mA)*
(mA)
SYNC
BLANK
Input Data
WHITE LEVEL
26.67
19.05
1
1
3FFH
VIDEO
video + 9.05
video + 1.44
1
1
data
VIDEO to BLANK
video + 1.44
video + 1.44
0
1
data
BLACK LEVEL
9.05
1.44
1
1
00H
BLACK to BLANK
1.44
1.44
0
1
00H
BLANK LEVEL
7.62
0
1
0
xxH
SYNC LEVEL
0
0
0
0
xxH
*Typical with full-scale IOG = 26.67 mA. VREF = 1.235 V, RSET = 560 Ω, ISYNC connected to IOG.
Table Ib. Video Output Truth Table for the ADV7121
IOR, IOG, IOB
DAC
Description
(mA)*
Input Data
WHITE LEVEL
17.62
3FF
VIDEO
video
data
VIDEO to BLACK
video
data
BLACK LEVEL
0
00H
*Typical with full scale = 17.62 mA. VREF = 1.235 V, RSET = 560 Ω.


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