參數(shù)資料
型號： TMC2491AR2C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL ENCODER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 13/36頁
文件大?。?/td> 208K
代理商： TMC2491AR2C
TMC2490A/TMC2491A
PRODUCT SPECIFICATION
20
Table 9. Subcarrier and Color Burst Reset
Values
Note:
1. Line numbering is in accordance with Figure 6, Figure 7,
and Figure 8. Subcarrier and color burst phase are relative
to the horizontal reference of the line specified above.
Table 10. Standard Subcarrier Parameters
NTSC
PAL-M
PAL-
B,G,H,I,N
Digital field:
1
Line number:
4
1
Subcarrier
phase reset
value:
180
°
0
°
0
°
Resultant color
burst phase:
0
°
+135
°
+135
°
Standard
Horizontal
Frequency (KHz)
Subcarrier
Frequency (MHz)
NTSC
15.734266
3.579545455
PAL B,G,H,I
15.625000
4.43361875
PAL-M
15.734266
3.57561189
PAL-N
15.625000
3.58205625
Luminance Processing
During horizontal and vertical blanking, the luma processor
generates blanking levels and properly timed and shaped
sync and equalization pulses. During active video, it captures
and rescales the incoming Y components and adds the results
to the blank level to complete a proper monochrome televi-
sion waveform, which is then upsampled to drive the luma
D/A and the composite adder.
For NTSC-EIA (5:2 white:sync, no black pedestal), the over-
all luma input-to-output equation for 0<Y<255 is:
luma out (IRE, relative to blank) = (Y - 16) * 100/219
For NTSC and PAL-M (5:2, with 7.5 IRE pedestal), the
equation becomes:
luma out (IRE, relative to blank) = (Y - 16) * 92.5/219 + 7.5
For all 625-line PAL standards (7:3, no pedestal), the equa-
tion becomes:
luma out (mV, relative to blank) = (Y-16) * 700/219
Since Y=0 and Y=255 are reserved values in CCIR-601,
results in the luma D/A outputting black, i.e., 0mV or 0 IRE
without pedestal, 7.5 IRE with pedestal. External compo-
nents are needed to bias the blanking/black level to 0mV/0
IRE. The values given in Table 11 and Table 12 reect a
biased output where the blanking level is at 0mV/0 IRE.
Table 11. Luminance Input Codes
Table 12. D/A Converter and Analog Levels
PD7-0 Input
Luma Level
(CCIR-601)
NTSC, PAL-M Luma Level (IRE)
PAL-B,G,H,I,N
Luma Level (mV)
Dec
Hex
PEDEN = 0
PEDEN = 1
255
FF
Reserved
0
7.5
0
254
FE
108.7
108
761
235
EB
100% white
100
700
16
10
Black
0
7.5
0
1
01
-6.9
1.2
-48
0
00
Reserved
0
7.5
0
Video Level
NTSC, PAL-M
NTSC w/o Setup
PAL-B,G,H,I,N
D/A
IRE
D/A
IRE
D/A
mV
Maximum Output
1022
134.8
1022
138.4
1022
817
100% white
820
100
820
100
800
700
Black
284
7.5
240
0
240
0
Blank
240
0
240
0
240
0
Sync
12
-40
12
-40
0
-300
White-to-blank
580
100
580
100
560
700
White-to- sync
808
140
808
140
800
1000
Color burst p-p
232
40
232
40
244
300
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