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參數(shù)資料
| 型號： | CH7008A-V |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Digital PC to TV Encoder Features |
| 中文描述： | 數(shù)字電視編碼器電腦功能 |
| 文件頁數(shù)： | 16/49頁 |
| 文件大?。?/td> | 341K |
| 代理商： | CH7008A-V |
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CHRONTEL
CH7008A
16
201-0000-027 Rev 2.2, 9/30/99
NTSC and PAL Operation
Composite and S-Video outputs are supported in either NTSC or PAL format. The general parameters used to
characterize these outputs are listed in
Table 10
and shown in
Figure 8
. (See
Figures 11
through
16
for illustrations
of composite and S-Video output waveforms).
CCIR624-3 Compliance
The CH7008 is predominantly compliant with the recommendations called out in CCIR624-3. The following are the
only exceptions to this compliance:
The frequencies of Fsc, Fh, and Fv can only be guaranteed in master mode, not in slave mode when the graphics
device generates these frequencies.
It is assumed that gamma correction, if required, is performed in the graphics device which establishes the color
reference signals.
All modes provide the exact number of lines called out for NTSC and PAL modes respectively, except mode 21,
which outputs 800x600 resolution, scaled by 3:4, to PAL format with a total of 627 lines (vs. 625).
Chroma signal frequency response will fall within 10% of the exact recommended value.
Pulse widths and rise/fall times for sync pulses, front/back porches, and equalizing pulses are designed to
approximate CCIR624-3 requirements, but will fall into a range of values due to the variety of clock frequencies
used to support multiple operating modes.
For this table and all subsequent figures, key values are:
Note:
1.
ISET = 360 ohms; V(ISET) = 1.235V; 75 ohms doubly terminated load.
2.
Durations vary slightly in different modes due to the different clock frequencies used.
3.
Active video and black (F, G, H) times vary greatly due to different scaling ratios used in different modes.
4.
Black times (F and H) vary with position controls.
Table 10. NTSC/PAL Composite Output Timing Parameters (in mS)
Symbol
Description
Level (mV)
Duration (uS)
NTSC
PAL
NTSC
PAL
A
Front Porch
287
300
1.49 - 1.51
1.48 - 1.51
B
Horizontal Sync
0
0
4.69 - 4.72
4.69 - 4.71
C
Breezeway
287
300
0.59 - 0.61
0.88 - 0.92
D
Color Burst
287
300
2.50 - 2.53
2.24 - 2.26
E
Back Porch
287
300
1.55 - 1.61
2.62 - 2.71
F
Black
340
300
0.00 - 7.50
0.00 - 8.67
G
Active Video
340
300
37.66 - 52.67
34.68 - 52.01
H
Black
340
300
0.00 - 7.50
0.00 - 8.67
相關PDF資料 |
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| CH7012 | Chrontel CH7012 TV Output Device |
| CH7012A | Chrontel CH7012 TV Output Device |
| CH7012A-T | Chrontel CH7012 TV Output Device |
| CH7202 | MPEG to TV Encoder with 8-bit Input |
| CH7203 | MPEG to TV Encoder with 16-bit Input |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CH7008-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| CH7008-V | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| CH7009A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Chrontel CH7009 DVI / TV Output Device |
| CH7009A-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Chrontel CH7009 DVI / TV Output Device |
| CH7011A-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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