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參數(shù)資料
| 型號： | SAA7120H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | Digital video encoder |
| 中文描述： | COLOR SIGNAL ENCODER, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44 |
| 文件頁數(shù)： | 28/36頁 |
| 文件大?。?/td> | 165K |
| 代理商： | SAA7120H |
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2002 Oct 11
28
Philips Semiconductors
Product specification
Digital video encoder
SAA7120H; SAA7121H
8.2
Teletext timing
Time t
FD
is the time needed to interpolate input data TTX
and insert it into the CVBS and Y output signal, such that
it appears at t
TTX
= 9.78
μ
s (PAL) or t
TTX
= 10.5
μ
s
(NTSC) after the leading edge of the horizontal
synchronization pulse.
Time t
PD
is the pipeline delay time introduced by the
source that is gated by TTXRQ in order to deliver TTX
data. This delay is programmable by register TTXHD. For
every active HIGH state at output pin TTXRQ, a new
teletext bit must be provided by the source.
Since the beginning of the pulses representing the TTXRQ
signal and the delay between the rising edge of TTXRQ
and valid teletext input data are fully programmable
(TTXHS and TTXHD), the TTX data is always inserted at
the correct position after the leading edge of outgoing
horizontal synchronization pulse.
Time t
TTXWin
is the internally used insertion window for
TTX data; it has a constant length that allows insertion of
360 teletextbitsatatextdatarateof6.9375 Mbits/s(PAL),
296 teletextbitsatatextdatarateof5.7272 Mbits/s(WST)
or 288 teletext bits at a text data rate of 5.7272 Mbits/s
(NABTS). The insertion window is not opened if the control
bit TTXEN is logic 0.
Using appropriate programming, all suitable lines of the
odd field (TTXOVS and TTXOVE) plus all suitable lines of
the even field (TTXEVS and TTXEVE) can be used for
teletext insertion.
handbook, full pagewidth
tTTXWin
tTTX
tPD
tFD
CVBS/Y
TTX
TTXRQ
textbit #:
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18 19 20
21
22
23
24
MBH788
Fig.10 Teletext timing.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7120H-01 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Video Encoder (ConDENC) |
| SAA7121 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Video Encoder (ConDENC) |
| SAA7121H | 制造商:NXP Semiconductors 功能描述: |
| SAA7121H/V2 | 制造商:NXP Semiconductors 功能描述: |
| SAA7121H/V2,518 | 功能描述:視頻 IC SAA7121H/QFP44/REEL13DP//V2 RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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