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CX25871 Datasheet(PDF) 45 Page - Synaptics Incorporated.

Part # CX25871
Description  Video Encoder with Adaptive Flicker Filtering and HDTV Output
PDF  291 Pages
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Manufacturer  CONEXANT [Synaptics Incorporated.]
Direct Link  https://www.synaptics.com/
Logo CONEXANT - Synaptics Incorporated.

CX25871 Datasheet(HTML) 45 Page - Synaptics Incorporated.

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CX25870/871
1.0 Functional Description
Flicker-Free Video Encoder with Ultrascale Technology
1.3 Device Description
100381B
Conexant
1-29
Figure 1-8 illustrates the frequency response of the sub-sampling process. If
4:4:4 data is input, it is subsampled to 4:2:2 prior to overscan compensation and
flicker filtering.
The resulting 4:2:2 output must then be converted to YUV values and then
scaled for the output range of the DACs. The MY, MCR, and MCB registers must
be programmed to perform this conversion. The scaling equations are as follows:
MY = (int) [V100/(219.0 * VFS) * 2
6 + 0.5]
MCR = (int)[(128.0/127.0) * V100 * 0.877/(224.0 * VFS * 0.713 * sinx) * 2
6 + 0.5]
MCB = (int)[(128.0/127.0)* V100 * 0.493/(224.0 * VFS * 0.564 * sinx) * 2
6 + 0.5]
where:V100 = 100% white voltage (0.661 V for NTSC, 0.7 V for PAL/SECAM)
VFS = Full scale output voltage (1.28 V)
Fsc = color subcarrier frequency (see Table A-2)
Fclk = Analog pixel rate
Sinx = Sin (
π ·F
SC/FCLK)/(π ·FSC/FCLK)
Figure 1-8. Decimation Filter at Fs=27 MHz
0
5
10
15
20
25
30
35
40
45
Frequency (Fs = 27 MHz)
01
2
3
45
6
Chroma Decimation Filter
100381_005



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