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BT481 Datasheet(PDF) 21 Page - List of Unclassifed Manufacturers

Part # BT481
Description  110 MHz 256-Word Color Palette 15-, 16-, and 24-Bit True Color Power-Down RAMDAC
PDF  52 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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BT481 Datasheet(HTML) 21 Page - List of Unclassifed Manufacturers

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Brooktree®
15
FUNCTIONAL DESCRIPTION
Controller Interface
L481A_C
Bt481A
110 MHz 256-Word Clor Palette 15-, 16-, and 24-Bit True Color Power-Down RAMDAC
Figure 4. RS-343A Composite Video Output Waveforms (SETUP = 7.5 IRE)
Note: 75
Ω doubly terminated load; SETUP = 7.5 IRE. VREF = 1.235 V and RSET = 147 Ω. RS-343A levels and tol-
erances are assumed on all levels.
MA
V
MA
1.000
26.67
19.05
0.714
0.054
1.44
0.00
0.000
9.05
7.62
0.286
White Level
Black Level
Blank Level
Sync Level
92.5 IRE
7.5 IRE
40 IRE
0.00
0.000
0.340
No Sync
Sync
V
Table 7. RS-343A Video Output Truth Table (SETUP = 7.5 IRE)
Description
Sync Disabled
Sync Enabled
SYNC*
BLANK*
DAC Input Data
Iout (mA)
Iout (mA)
White
19.05
26.67
1
1
$FF
Data
Data + 1.44
Data + 9.05
1
1
Data
Data - Sync
Data + 1.44
Data + 1.44
0
1
Data
Black
1.44
9.05
1
1
$00
Black - Sync
1.44
1.44
0
1
$00
Blank
0
7.62
1
0
$xx
Sync
0000
$xx
Note: 75
Ω doubly terminated load; SETUP = 7.5 IRE. VREF = 1.235 V and RSET = 147 Ω.



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