ch7003b-v Chrontel, ch7003b-v Datasheet - Page 18

• Manufacturer Part Number: ch7003b-v
• Description: Ch7003 Digital Pc To Tv Encoder
• Manufacturer: Chrontel

CHRONTEL
4.5 NTSC and PAL Operation
Composite and S-Video outputs are supported in either NTSC or PAL format.
characterize these outputs are listed in Table 14 and shown in Figure 10. (See Figure 13 through 18 for
illustrations of composite and S-Video output waveforms.)
4.5.1 CCIR624-3 Compliance
The CH7003 is predominantly compliant with the recommendations called out in CCIR624-3. The following are
the only exceptions to this compliance:
• The frequencies of Fsc, Fh, and Fv can only be guaranteed in master or psuedo-master modes, not in slave mode
• It is assumed that gamma correction, if required, is performed in the graphics device which establishes the color
• All modes provide the exact number of lines called out for NTSC and PAL modes respectively, except mode 21,
• Chroma signal frequency response will fall within 10 % of the exact recommended value.
• Pulse widths and rise/fall times for sync pulses, front/back porches, and equalizing pulses are designed to
For this table and all subsequent figures, key values are:
Note:
18
Table 14. NTSC/PAL Composite Output Timing Parameters (in S)
Symbol
when the graphics device generates these frequencies.
reference signals.
which outputs 800x600 resolution, scaled by 3:4, to PAL format with a total of 627 lines (vs. 625).
approximate CCIR624-3 requirements, but will fall into a range of values due to the variety of clock frequencies
used to support multiple operating modes.
G
A
B
C
D
E
H
F
1. RSET = 360 ohms; V(RSET) = 1.235V; 75 ohms doubly terminated load.
2. Durations vary slightly in different modes due to the different clock frequencies used.
3. Active video and black (F, G, H) times vary greatly due to different scaling ratios used in different modes.
4. Black times (F and H) vary with position controls.
Front Porch
Horizontal Sync
Breezeway
Color Burst
Back Porch
Black
Active Video
Black
Description
NTSC
287
287
287
287
340
340
340
0
Level (mV)
PAL
300
300
300
300
300
300
300
0
201-0000-023 Rev. 4.2, 4/12/2002
1.49 - 1.51
4.69 - 4.72
0.59 - 0.61
2.50 - 2.53
1.55 - 1.61
0.00 - 7.50
37.66 - 52.67
0.00 - 7.50
The general parameters used to
NTSC
Duration (uS)
CH7003B
1.48 - 1.51
4.69 - 4.71
0.88 - 0.92
2.24 - 2.26
2.62 - 2.71
0.00 - 8.67
34.68 - 52.01
0.00 - 8.67
PAL