參數資料
型號： TMC2491A
廠商： Fairchild Semiconductor Corporation
英文描述： Multistandard Digital Video Encoder(多標準數字視頻編碼器)
中文描述： 多標準數字視頻編碼器（多標準數字視頻編碼器）
文件頁數： 20/36頁
文件大?。?/td> 208K
代理商： TMC2491A
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
1
4
180
°
PAL-M
1
4
0
°
PAL-
B,G,H,I,N
1
1
0
°
Digital field:
Line number:
Subcarrier
phase reset
value:
Resultant color
burst phase:
0
°
+135
°
+135
°
Standard
NTSC
PAL B,G,H,I
PAL-M
PAL-N
Horizontal
Frequency (KHz)
15.734266
15.625000
15.734266
15.625000
Subcarrier
Frequency (MHz)
3.579545455
4.43361875
3.57561189
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 reflect 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
PD
7-0
Input
Dec
255
254
235
16
1
0
Luma Level
(CCIR-601)
Reserved
NTSC, PAL-M Luma Level (IRE)
PEDEN = 0
0
108.7
100
0
-6.9
0
PAL-B,G,H,I,N
Luma Level (mV)
0
761
700
0
-48
0
Hex
FF
FE
EB
10
01
00
PEDEN = 1
7.5
108
100
7.5
1.2
7.5
100% white
Black
Reserved
Video Level
Maximum Output
100% white
Black
Blank
Sync
White-to-blank
White-to- sync
Color burst p-p
NTSC, PAL-M
D/A
1022
820
284
240
12
580
808
232
NTSC w/o Setup
D/A
1022
820
240
240
12
580
808
232
PAL-B,G,H,I,N
D/A
1022
800
240
240
0
560
800
244
IRE
134.8
100
7.5
0
-40
100
140
40
IRE
138.4
100
0
0
-40
100
140
40
mV
817
700
0
0
-300
700
1000
300
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