BT864A View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

BT864A

YCrCb to NTSC/PAL Digital Video Encoder

Conexant Systems 

1.0 Circuit Description

1.5 Video Timing

Bt864A/865A

YCrCb to NTSC/PAL Digital Video Encoder

1.5 Video Timing

The width of the analog horizontal sync pulses and the start and end of color burst

are automatically calculated and inserted for each mode according to

ITU-RBT.470-3. Color burst is disabled on appropriate scan lines. Serration and

equalization pulses are generated on appropriate scan lines. In addition, rise and

fall times of sync, closed-caption data transitions, and the burst envelope are

internally controlled. Figures 1-4–1-12 show the timing characteristics for various

Bt864A/865A modes of operation.

Figure 1-4. Interlaced 525-Line (NTSC) Video Timing

VSYNC*

Analog

FIELD 1

RESET*

523 524 525 1

2

3

4

5

6

7

8

9

10

22

BURST PHASE

Analog

FIELD 2

261 262 263 264 265 266 267 268 269 270 271 272

285

Analog

FIELD 3

523 524 525 1

2

3

4

5

6

7

8

9

10

22

BURST PHASE

Analog

FIELD 4

261 262 263 264 265 266 267 268 269 270 271 272

285

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

NOTE(S): SMPTE line numbering convention rather than ITU-R BT.470-3 is used. EVBI = 0

1-8

Conexant

100138B

Share Link: