参数资料
型号: TVP5146M2PFPG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP80
封装: GREEN, PLASTIC, HTQFP-80
文件页数: 25/107页
文件大小: 1427K
代理商: TVP5146M2PFPG4
Functional Description
16
SLES141B—August 2007
TVP5146M2PFP
TVP5146M2
74
XTAL1
14.31818-MHz
Crystal
75
XTAL2
TVP5146M2
74
XTAL1
75
XTAL2
CL1
CL2
14.31818-MHz
Clock
Figure 212. Reference Clock Configurations
2.4
Real-Time Control (RTC)
Although the TVP5146M2 decoder is a line-locked system, the color burst information is used to determine
accurately the color subcarrier frequency and phase. This ensures proper operation with nonstandard video
signals that do not follow exactly the required frequency multiple between color subcarrier frequency and video
line frequency. The frequency control word of the internal color subcarrier PLL and the subcarrier reset bit are
transmitted via terminal 37 (GLCO) for optional use in an end system (for example, by a video encoder). The
frequency control word is a 23-bit binary number. The instantaneous frequency of the color subcarrier can be
calculated from the following equation:
F
PLL
+
F
ctrl
223
F
sclk
where FPLL is the frequency of the subcarrier PLL, Fctrl is the 23-bit PLL frequency control word, and Fsclk is
two times the pixel frequency. Figure 213 shows the detailed timing diagram.
RTC
45 CLK
18 CLK
L
S
B
0
3 CLK
128 CLK
23-Bit Fsc PLL Increment
Start
Bit
1 CLK
R
S
Invalid
Sample
Valid
Sample
M
S
B
22
Reserved
NOTE:
RTC Reset bit (R) is active low, Sequence bit (S) PAL:1 = (R-Y) line normal, 0 = (R-Y) line inverted, NTSC: 1 = no change
Figure 213. RTC Timing
2.5
Output Formatter
The output formatter sets how the data is formatted for output on the TVP5146M2 output buses. Table 21
shows the available output modes.
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