參數(shù)資料
型號： TVP5020TQFP
廠商： Texas Instruments, Inc.
英文描述： NTSC/PAL VIDEO DECODER
中文描述： NTSC / PAL視頻解碼器
文件頁數(shù)： 21/87頁
文件大?。?/td> 387K
代理商： TVP5020TQFP
2–7
TVP5020
XTAL1
XTAL2
35
36
TVP5020
XTAL1
XTAL2
35
36
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
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.
Sampling Frequencies and Patterns
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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