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BT856 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers

Part # BT856
Description  YCrCb or RGB to NTSC/PAL Digital Video Encoder
PDF  54 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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BT856 Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers

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Brooktree®
7
CIRCUIT DESCRIPTION
Video Timing
Bt856/7
Video Timing
The width of the analog horizontal sync pulses and the start and end of color burst is
automatically calculated and inserted for each mode according to CCIR624-4. Color
burst is disabled on appropriate scan lines. Serration and equalization pulses are gen-
erated on appropriate scan lines. In addition, rise and fall times of sync, closed-cap-
tion data transitions, and the burst envelope are internally controlled. Figures 3–6
show the timing characteristics for various Bt856/7 modes of operation.
Figure 3. Interlaced 525-Line (NTSC, PAL-M) Video Timing
Note:
SMPTE line numbering convention rather than CCIR624 is used.
22
7
6
5
4
3
BURST PHASE
2
1
525
524
523
Analog
Field 1
Start
of
VSYNC
Analog
Field 2
272
271
270
269
268
267
263
262
261
266
265
264
285
Analog
Field 3
BURST PHASE
Analog
Field 4
Burst Begins with Positive Half-Cycle
Burst Phase = Reference Phase = 180˚ Relative to B–Y
Burst Begins with Negative Half-Cycle
Burst Phase = Reference Phase = 180˚ Relative to B–Y
89
10
22
7
6
5
4
3
2
1
525
524
523
89
10
272
271
270
269
268
267
263
262
261
266
265
264
285



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