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參數(shù)資料
| 型號： | TMS320AV420 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital NTSC Encoder(數(shù)字NTSC編碼器) |
| 中文描述： | NTSC制式的數(shù)字編碼器（數(shù)字NTSC制式編碼器） |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 487K |
| 代理商： | TMS320AV420 |
TMS320AV420
DIGITAL NTSC ENCODER
SCSS015A – AUGUST 1994 – REVISED SEPTEMBER 1995
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
tstart
CLK135
HSYNC
D(7:0)
D(15:8)
U
V
U
V
U
U
V
U
V
U
V
U
V
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Figure 3. YUV 4:2:2 Video Data-Input Timing
output format and output filter
The ’AV420 outputs the analog video signal in the S-video format on two separate channels, the luminance (Y)
channel and the chrominance (C) channel. The Y and the C signals are RS170A-compatible, except for the
setup level that is zero IRE units in the ’AV420. The Y and the C signals are output on the YOUT and the COUT
terminals under the controls applied through the IREFY, COMPY, BIASY and the IREFC, COMPC, BIASC
terminals.
The S-video signal can be used as is or it can be improved by the use of an external signal reconstruction filter.
The RS170A composite video signal can be generated by the use of an external Y/C-combining circuit.
The ’AV420 D/As update the video-signal waveform at the 13.5-MHz pixel clock (CLK135) rate. This update rate
is sufficient to completely reconstruct the analog-video signal from its samples synthesized inside the ’AV420,
because the Y, C, synchronization, and color-burst signals are contained in the 6.75-MHz signal bandwidth.
Figure 4 shows the levels of the Y and C signals for 100% saturation NTSC color bars.
DAC
Data
235
70
4
VYOUT
(mV)
4836
3547
3031
Luma
(IRE)
100
0
–40
YOUT Waveform
DAC
Data
245
128
11
VCOUT
(mV)
4914
4000
3086
Chroma
(IRE)
47
0
–47
COUT Waveform
91
3711
–20
165
4289
20
Color
Burst
Yellow
Cyan
Green
Magenta
Red
Blue
Y C
M
G
R B
Figure 4. YOUT and COUT for a 100% Saturation Color Bar Signal
As a first-order approximation, a sample-and-hold circuit inside the D/As can be used to reconstruct the video
signal. This reconstruction is equivalent to using a zero-order-hold (ZOH) and is not the optimal reconstruction
method. The ZOH reconstruction allows the ’AV420 to be used as is.
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