CHRONTEL

CH7002D

12

201-0000-029 Rev6.1, 8/2/99

NTSC and PAL Operation

Composite and S-Video outputs are supported in either NTSC or PAL format.

The general parameters used to

characterize these outputs are listed in Table 4 and shown in Figure 8. (See Figures 9 through 16 for illustrations of

composite and S-Video output waveforms.)

Notes: For this table and all subsequent figures: RSET = 324 ohms; V(RSET) = 1.235 V; 75 ohms doubly terminated

load (BLR=61 for NTSC, and BLR=52 for PAL), 100% amplitude, 100% saturation bars are shown (100%=0.66071V).

1 Durations vary slightly in different modes due to the different clock frequencies used.

2 Active video times vary greatly due to different scaling ratios used in different modes.

3 Black times (F and H) vary with position controls.

Figure 8: NTSC / PAL Composite Output

Table 4. NTSC/PAL Composite Output Timing Parameters (in

µS)

Symbol

Description

Level (mV)

Duration (uS)

NTSC

PAL

NTSC

PAL

A

Front Porch

310

310

1.49 - 1.52

1.50 - 1.78

B

Horizontal Sync

24

24

4.69 - 4.72

4.43 - 4.73

C

Breezeway

310

310

0.60

0.57 - 0.60

D

Color Burst

310

310

2.48 - 2.50

2.33 - 2.52

E

Back Porch

310

310

1.60

1.50 - 1.60

F

Black

363

310

0.92 - 3.64

0.00 - 4.24

G

Active Video

363-1030

310-977

45.40 - 50.84

45.20 - 53.00

H

Black

363

310

0.92 - 3.64

0.00 - 4.24

A

B

C

D

E

F

G

H