CH7006C datasheet(18/49 Pages) ETC

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CHRONTEL

CH7006C

201-0000-026 Rev 2.1, 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 13 and shown in Figure 10. (See Figure 13 through 18 for

illustrations of composite and S-Video output waveforms.)

CCIR624-3 Compliance

The CH7006 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 pseudo-master modes, not in slave mode

when the graphics device generates these frequencies.

• It is assumed that gamma correction, if required, is performed in the graphics device which establishes the color

reference signals.

• All modes provide the exact number of lines called out for NTSC and PAL modes respectively, except mode 21,

which outputs 800x600 resolution, scaled by 3:4, to PAL format with a total of 627 lines (vs. 625).

• 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

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

For this table and all subsequent figures, key values are:

Note:

1. ISET = 360 ohms; V(ISET) = 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.

Table 13. NTSC/PAL Composite Output Timing Parameters (in

µS)

Symbol

Description

Level (mV)

Duration (uS)

NTSC

PAL

NTSC

PAL

Front Porch

287

300

1.49 - 1.51

1.48 - 1.51

Horizontal Sync

4.69 - 4.72

4.69 - 4.71

Breezeway

287

300

0.59 - 0.61

0.88 - 0.92

Color Burst

287

300

2.50 - 2.53

2.24 - 2.26

Back Porch

287

300

1.55 - 1.61

2.62 - 2.71

Black

340

300

0.00 - 7.50

0.00 - 8.67

Active Video

340

300

37.66 - 52.67

34.68 - 52.01

Black

340

300

0.00 - 7.50

0.00 - 8.67

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