TVP5020 datasheet(21/87 Pages) TI

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TVP5020

XTAL1

XTAL2

TVP5020

XTAL1

XTAL2

26.8 MHz or

24.576 MHz

Crystal

26.8 MHz or

24.576 MHz

TTL Clock

Figure 2–11. Reference Clock Configurations

The TVP5020 generates three signals PCLK, SCLK, and PREF used for clocking data. PCLK is the pixel

clock at the sampling frequency. PCLK can be used for clocking data in the 16-bit 4:2:2 and the 12-bit 4:1:1

output formats. SCLK is at twice the sampling frequency and may be used for clocking data in the 8-bit 4:2:2

and ITU-R BT.656 formats. PREF is used as a clock qualifier with SCLK to clock data in the 16-bit 4:2:2 and

the 12-bit 4:1:1 formats

2.3

Video Output Format

The TVP5020 supports both square-pixel and ITU-R BT.601 sampling formats and multiple output formats:

•

16-bit 4:2:2

•

12-bit 4:1:1

•

8-bit 4:2:2

•

ITU-R BT.656

2.3.1

Sampling Frequencies and Patterns

The sampling frequencies that control the number of pixels per line differ depending on the video format and

standards. Table 2–1 shows a summary of the sampling frequencies.

Table 2–1. Summary of the Line Frequencies, Data Rates, and Pixel Counts

STANDARDS

HORIZONTAL

LINE RATE

(kHz)

PIXELS

PER LINE

ACTIVE PIXELS

PER LINE

PCLK (MHz)

SCLK (MHz)

NTSC, square-pixel

15.73426

780

640

12.2727

24.54

NTSC, ITU-R BT.601

15.73426

858

720

13.5

27.0

PAL (B,D,G,H,I), square-pixel

15.625

944

768

14.75

29.5

PAL (B,D,G,H,I), ITU-R BT.601

15.625

864

720

13.5

27.0

PAL(M), square-pixel

15.73426

780

640

12.2727

24.54

PAL(M), ITU-R BT.601

15.73426

858

720

13.5

27.0

PAL(N), square-pixel

15.625

944

768

14.75

29.5

PAL(N), ITU-R BT.601

15.625

864

720

13.5

27.0

Depending on the output format chosen, The TVP5020 outputs data in the 4:2:2 or 4:1:1 sampling pattern.

The patterns differ in the number of chrominance samples derived from the original samples. For the 4:2:2

pattern, every second sample is both a luminance and a chrominance sample; the remainder are

luminance-only samples. For the 4:1:1 pattern, every fourth sample is both a luminance and a chrominance

sample; the remainder are luminance-only samples.

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