- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373030 > BT865AKPF Color Encoder Circuit PDF資料下載
參數(shù)資料
| 型號： | BT865AKPF |
| 英文描述： | Color Encoder Circuit |
| 中文描述： | 顏色編碼器電路 |
| 文件頁數(shù)： | 36/76頁 |
| 文件大?。?/td> | 1050K |
| 代理商： | BT865AKPF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁當(dāng)前第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁
1.0 Circuit Description
Bt864A/865A
1.9 Teletext
YCrCb to NTSC/PAL Digital Video Encoder
1-26
Conexant
100138B
1.9 Teletext
Teletext encoding is accomplished via a two-wire interface, TTXDAT and
TTXREQ, and internal registers that are programmed through the I
2
C interface.
Teletext encoding in the Bt864A/865A conforms to Teletext B for 625/50
television systems. See
“
Recommendation 653-1 Teletext Systems
”
for further
information about the standard. Teletext should be disabled for 525-line television
systems.
The internal registers allow for the enable/disable of teletext and the
programming of the start and stop of the TTXREQ signal, the active teletext lines
in an FIELD 1, and the active teletext lines in FIELD 2. Active teletext lines
override closed caption, Macrovision, the BLANK* input, and active video. See
the
“
Internal Registers
”
section for more details.
The TTXREQ signal is generated by the encoder to indicate to external
devices when teletext data is required. The start and end of the TTXREQ signal
waveform is determined by the value of registers TXHS and TXHE, respectively.
The values of registers TXHS and TXHE correspond to the internal clock (CLK)
counter (see
Figure 1-19
). The proper selection of these edges will allow the user
to adjust for the propagation delay of the teletext source, so that the teletext data is
provided to the TTXDAT pin at the proper time. If the falling edge of TTXREQ
does not occur by the end of the video line, the beginning of the new video line
will automatically reset TTXREQ. Legal values for these registers are given in
Table 1-5
.
The data to TTXDAT is sampled on every rising input clock edge and must
meet the following protocol for proper teletext data insertion. The protocol
demands that the teletext data bit duration is the required number of CLKs.
Internal to the chip is a sequencer and a data shaper to minimize the jitter.
Using the midpoint of the falling edge of the horizontal sync pulse as it appears at
the output Y/CVBS or CVBS/G, the teletext data protocol must begin 262 to 264
CLKs later for CCIR601(13.5 MHz pixel rate) or 286 to 288 CLKs later for
Square Pixel Operation (14.75 MHz pixel rate). Relative to the internally
generated teletext window, the protocol must start 5 to 7 clocks earlier. The
teletext window begins at 10.2 μsec from the horizontal sync pulse's falling edge
and the data rate is the specified 6.9375 Mbits/sec.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BT867KPF | Color Encoder Circuit |
| BT867KPJ | Color Encoder Circuit |
| BT8920EPJ | Analog-to-Digital Converter， 16-Bit |
| BT8920EPJ600 | Analog-to-Digital Converter， 16-Bit |
| BT8921ESS | xDSL Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT865AKRF | 制造商:CONEXANT 制造商全稱:CONEXANT 功能描述:YCrCb to NTSC/PAL Digital Video Encoder |
| BT866KPF | 制造商:Brooktree 功能描述:Video/TV Circuit, Color Encoder Circuit, 52 Pin, Plastic, QFP |
| BT866KPJ | 制造商:BT 功能描述:Video/TV Circuit, Color Encoder Circuit, 68 Pin, Plastic, PLCC 制造商:Burns and Towne Inc 功能描述:Video/TV Circuit, Color Encoder Circuit, 68 Pin, Plastic, PLCC |
| BT867KPF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
| BT867KPJ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。